Academic literature on the topic 'Polyurethane fiber'
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Journal articles on the topic "Polyurethane fiber"
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Kiyanenko, Elena A., Artur D. Nurislamov, Ksenia V. Golovanova, Gulnara I. Amerkhanova, and Lubov A. Zenitova. "Polyurethane filled with modified basalt fiber." Butlerov Communications 63, no. 7 (2020): 111–18. http://dx.doi.org/10.37952/roi-jbc-01/20-63-7-111.
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The use of basalt fiber as a reinforcing filler is mainly used instead of glass fibers due to its unique properties. Basalt fiber in comparison with glass has a 10-22% greater modulus, higher absolute strength after exposure to 400 °C, superior to glass in alkali and especially acid resistance, approximately identical in water resistance, i.e. close in properties to high-modulus glass fibers. However, it is most often used as a filler for concrete and other building structures. There is much less information about its use as a polymer reinforcing filler. The polymer matrix for creating polymer composite materials is most often epoxy resins, less often polyester. At the same time, there is practically no data on polyurethanes that have a unique combination of high strength indicators with elasticity and hardness, resistance to solvents and aggressive media, abrasion resistance, etc. The use of basalt fiber as a filler that increases the strength characteristics of polyurethanes and gives them specific properties can significantly expand the scope of their application. In this regard, this study attempts to use crushed basalt fiber as a reinforcing filler for polyurethanes. In order to increase the adhesion of the polymer matrix – filler system, an adhesive based on water-based polyurethane dispersion is used. Samples were obtained based on a polyurethane binder filled with basalt fiber in amounts up to 10.0 % by weight, treated with water-polyurethane dispersion with a concentration of 10 to 20 % by weight. The best complex of strength properties is provided by polyurethanes filled with basalt fiber in the amount of 1.0% by weight, treated with 15 % by weight water-based polyurethane dispersion. At the same time, the tensile strength increased by 15% compared to the same filling without processing and by 50% compared to the unfilled analog and amounted to 33.7 MPa. These changes are explained by a more uniform distribution of crushed basalt fiber in the polymer matrix and an increase in the adhesion interaction of fiber-adhesive-polymer matrix due to the biphilicity of the adhesive, as well as the same (polyurethane) nature of the adhesive and the matrix. The developed polymer composite materials have high hydrolytic resistance, as well as resistance to acetone and hexane. At the same time, the greatest degree of swelling did not exceed 0.9 % of the mass.
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Do, Nhi Thi, Hop Quang Tran, Hanh Thi My Diep, and Vi Thi Vi Do. "Study on properties of composites polyurethane foam reinforced by bamboo fiber." Science and Technology Development Journal 19, no. 4 (2016): 212–20. http://dx.doi.org/10.32508/stdj.v19i4.693.
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This study focuses on the development and characterization of polyurethane/bamboo fiber composites foams which have the specific properties to participate both in the thermal insulation and regulation of the humidity inside the building. The polyurethane foam reinforced by bamboo fibers (5–20 wt%) were produced to investigate the mechanical test, the morphological characterization and thermal properties. The result from mechanical test showed that the compressive strength was increased at 5 wt % of bamboo fiber. Likewise, the effects of the fibre diameter and nature of bamboo fibers on some properties (compressive test, thermal analyses, surface morphology) of bamboo fibre reinforced rigid polyurethane foam were studied. The bamboo Gai and Luong fibres result in composites with better mechanical strength than the other fiber composites.
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Zhang, Yuanchi, and Jinlian Hu. "Robust Effects of Graphene Oxide on Polyurethane/Tourmaline Nanocomposite Fiber." Polymers 13, no. 1 (2020): 16. http://dx.doi.org/10.3390/polym13010016.
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The use of energy therapy including tourmaline/negative ions has gained huge popularity due to their long-standing historical evidence in improving human health and the technology development. However, the limitations of tourmaline based polyurethane fibers including the unsatisfied mechanical properties and negative ions releasing performances hind their further applications for wearable energy therapy. In this study, graphene oxide was modified within the polyurethane/tourmaline nanocomposite and then the wet-spinning method was used to prepare the fibers. As expected, the results proved that polyurethane/tourmaline/graphene oxide fiber had enhanced Young’s modulus (8.4 MPa) and tensile stain at break (335%). In addition, the number of released negative ions from polyurethane/tourmaline/graphene oxide fiber was significantly improved 17 times and 1.6 times more than that of neat polyurethane fiber and polyurethane/tourmaline fiber, respectively. Moreover, the releasing number of negative ions was significantly decreased after being applying voltage. We envision that the proposed polyurethane/tourmaline/graphene oxide fiber will provide valuable insights into the development of the wearable energy products.
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Cao, Chun Ping, Yu Sun, and Yu Li. "Optimization of Parameters in Fiber Reinforced Polyurethane Composited Reaction Injection Molding." Advanced Materials Research 748 (August 2013): 96–100. http://dx.doi.org/10.4028/www.scientific.net/amr.748.96.
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In order to explore effects of various processing parameters on the mechanical properties of jute fiber reinforced polyurethane foam composites, jute fiber reinforced polyurethane composites were prepared by variable fiber reinforced reaction injection technology. The influence of jute fiber contents, fiber length, mold pressure and fiber modification treatment to the impact toughness was analyzed by orthogonal test in this paper. The microstructure and fracture micrograph of impact fracture specimens were studied with scanning electron microscope (SEM). The results showed that the best impact performance was obtained while fiber content was 10%, fiber length was12.5mm, mold pressure was 80tons, and jute fibers were modified by alkali. Furthermore, the result was compared with the corresponding research of glass fiber and carbon fiber reinforced polyurethane composites, and provided a theoretical basis for the application of the fiber reinforced polyurethane foam composites.
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Ucpinar, Bedriye, and Ayse Aytac. "Influence of different surface-coated carbon fibers on the properties of the poly(phenylene sulfide) composites." Journal of Composite Materials 53, no. 8 (2018): 1123–32. http://dx.doi.org/10.1177/0021998318796159.
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This paper aims to study the effect of different surface coatings of carbon fiber on the thermal, mechanical, and morphological properties of carbon fiber reinforced poly(phenylene sulfide) composites. To this end, unsized and different surface-coated carbon fibers were used. Prepared poly(phenylene sulfide)/carbon fiber composites were characterized by using Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, tensile test, dynamic mechanical analysis, and scanning electron microscopy. Tensile strength values of the surfaced-coated carbon fibers reinforced poly(phenylene sulfide) composites are higher than the unsized carbon fiber reinforced poly(phenylene sulfide) composite. The highest tensile strength and modulus values were observed for the polyurethane-coated carbon fiber reinforcement. Dynamic mechanical analysis studies indicated that polyurethane-coated carbon fiber reinforced composite exhibited higher storage modulus and better adhesion than the others. Differential scanning calorimetry results show that melting and glass transition temperature of the composites did not change significantly. Scanning electron microscopic studies showed that polyurethane and epoxy-coated carbon fibers exhibited better adhesion with poly(phenylene sulfide).
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Zhao, Ruifang, Pengfei Tan, Yanting Han, et al. "Preparation and Performance Evaluation of Antibacterial Melt-Spun Polyurethane Fiber Loaded with Berberine Hydrochloride." Polymers 13, no. 14 (2021): 2336. http://dx.doi.org/10.3390/polym13142336.
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(1) Background: Bacterial infections have long threatened global public safety; hence, it is significant to continuously develop antibacterial fibers that are closely related to people’s daily lives. Berberine hydrochloride is a natural antibacterial agent that has application prospects in the preparation of antibacterial fibers. (2) Methods: This study firstly verified the antibacterial properties of berberine hydrochloride and its possible antibacterial mechanism. Thereafter, berberine hydrochloride was introduced into the self-made melt-spun polyurethane fiber through optimized coating technology. The performance of coating modified polyurethane fiber has been systematically evaluated, including its antibacterial properties, mechanical properties, and surface wettability. (3) Results: Results show that the antibacterial polyurethane fiber with desirable comprehensive properties is expected to be used in the biomedical fields. (4) Conclusions: The research also provides a reference for the development and application of other natural antibacterial ingredients in fiber fields.
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Kijeńska-Gawrońska, Ewa, Adrian Maliszewski, and Monika Bil. "Evaluation of the Shape Memory Effect of Random and Aligned Electrospun Polyurethane Mats with Different Fibers Diameter." Polymers 14, no. 24 (2022): 5468. http://dx.doi.org/10.3390/polym14245468.
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Fibrous shape memory scaffolds composed of thermoplastic polyurethane based on a mixture of polycaprolactone diols were fabricated. The effect of the fiber diameter and arrangement– random (rPU) or aligned (aPU), on crystallinity, mechanical properties, and shape memory was analyzed. The diameters of the fibers were controlled by changing the concentration of polyurethane (PU) solutions in the range of 5% to 16% and fibers alignment by utilization of different collectors. The chemical structure was confirmed by Fourier Transformed Infrared spectroscopy (FTIR), crystallinity was evaluated based on differential scanning calorimetry (DSC,) and mechanical properties were measured by the tensile test. Additionally, shape memory programming was performed using a dynamic mechanical analyzer (DMA), and shape recovery was evaluated in the air and in the water environment. DSC results showed that the electrospinning process did not change the crystallinity or melting temperature of synthesized thermoplastic polyurethanes. The melting temperature of the crystalline switching segments was around 26–27 °C, and the crystalline phase of hard segments was around 130 °C. Shape memory properties were analyzed in the contest of the fiber diameter and alignment of the fibers, while changes in the fibers’ diameters from 360 nm to 1760 nm did not result in significant changes in shape recovery coefficient (Rr) especially evaluated in the air. The longitudinal fiber alignment enhanced mechanical and shape recovery to up to 96% for aPU, with the highest fiber diameter when evaluated in water.
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Faturechi, Rahim, Ata Hashemi, Nabiollah Abolfathi, Atefeh Solouk, and Alexander Seifalian. "Fabrications of small diameter compliance bypass conduit using electrospinning of clinical grade polyurethane." Vascular 27, no. 6 (2019): 636–47. http://dx.doi.org/10.1177/1708538119850994.
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Objective Compliance and viscoelastic mismatches of small diameter vascular conduits and host arteries have been the cause of conduit’s failure. Methods To reduce these mismatches, the aim of this study was to develop and characterize a polyurethane conduit, which mimics the viscoelastic behaviors of human arteries. Electrospinning technique was used to fabricate tubular polyurethane conduits with similar properties of the human common carotid artery. This was achieved by manipulating the fiber diameter by altering the syringe flow rate of the solution. The mechanical and viscoelastic properties of the fabricated electrospun polyurethane conduits were, then, compared with commercially available vascular conduits, expanded polytetrafluoroethylene, polyethylene terephthalate (Dacron®) and the healthy human common carotid arteries. In addition, a comprehensive constitutive model was proposed to capture the visco-hyperelastic behavior of the synthetic electrospun polyurethanes, commercial conduits and human common carotid arteries. Results Results showed that increasing the fiber diameter of electrospun polyurethanes from 114 to 190 nm reduced Young’s modulus from 8 to 2 MPa. Also, thicker fiber diameter yielded in higher conduits’ viscosity. Furthermore, the results revealed that proposed visco-hyperelastic model is strongly able to fit the experimental data with great precision which proofs the reliability of the proposed model to address both nonlinear elasticity and viscoelasticity of the electrospun polyurethanes, commercial conduits and human common carotid arteries. Conclusions In conclusion, statistical analysis revealed that the elastic and viscous properties of 190 nm fiber diameter conduit are very similar to that of human common carotid artery in comparison to the commercial expanded polytetrafluoroethylene and Dacron® that are up to nine and seven times stiffer than natural vessels. Therefore, based on our findings, from the mechanical point of view, by considering the amount of Young’s modulus, compliance, distensibility and viscoelastic behavior, the fabricated electrospun polyurethane with fiber diameter of 189.6 ± 52.89 nm is an optimum conduit with promising potential for substituting natural human vessels.
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Feng, Jianyong. "Preparation and performance control of poly(lactic acid) fiber/polyurethane composite porous biomimetic-aligned scaffolds." Journal of Industrial Textiles 46, no. 6 (2016): 1297–318. http://dx.doi.org/10.1177/1528083715624257.
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Because of important potential and application prospect of aligned scaffolds in tissue engineering, it is necessary to prepare aligned scaffolds different from previous methods. We have prepared poly(lactic acid) fiber/polyurethane adhesive composite-aligned scaffolds by 1000 poly(lactic acid) melt parallel arrangement fibers and different polyurethane contents at 5, 10, 20, 25, and 30% separately. It can be found that polyurethane contents have great influence on bonding effect between fiber and adhesive, surface and cross-sectional morphology, thickness, weight, contact angle, stress and strain, pore diameter, porosity, pore interconnectivity, water absorption, and gelatin impregnation. The maximum of pore diameter and porosity of aligned scaffolds can be achieved to 64.24 µm and 66.67% by controlling poly(lactic acid) fiber parallel arrangement and polyurethane adhesive content. Moreover, the ultimate stresses of aligned scaffolds are 3.47 MPa along length direction and 1.02 MPa in width direction. Each composite-aligned scaffold has better fiber parallel arrangement, pore structure, and stress.
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Wu, Xiao, Xin Hua Liu, Cui E. Wang, Wei Chao Lv, and Hong Zhang Li. "Preparation of Modified Polyurethane Fiber and Study of its Lead Ions Adsorption." Advanced Materials Research 887-888 (February 2014): 711–15. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.711.
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Modified polyurethane fiber was prepared by wet spinning method, Different amount of chitosan powder that dissolving in polyurethane solution to get spinning solution were examined. This materials presents excellent adsorption capacity on Pb2+. the absorption type on Pb2+ of this modified fibers was monomolecular. The modified fibers get the maximum adsorption 25.53mg/g when the quality ratio of chitosan and polyurethane was 1:1 under the condition of 30°C and pH 6.
Dissertations / Theses on the topic "Polyurethane fiber"
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Haber, Zachary. "ON THE USE OF POLYURETHANE MATRIX CARBON FIBER COMPOSITES FOR STRENGTHENING CONCRETE STRUCTURES." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4105.
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Fiber-reinforced polymer (FRP) composite materials have effectively been used in numerous reinforced concrete civil infrastructure strengthening projects. Although a significant body of knowledge has been established for epoxy matrix carbon FRPs and epoxy adhesives, there is still a need to investigate other matrices and adhesive types. One such matrix/adhesive type yet to be heavily researched for infrastructure application is polyurethane. This thesis investigates use of polyurethane matrix carbon fiber composites for strengthening reinforced concrete civil infrastructure. Investigations on mirco- and macro-mechanical composite performance, strengthened member flexural performance, and bond durability under environmental conditioning will be presented. Results indicate that polyurethane carbon composites could potentially be a viable option for strengthening concrete structures.<br>M.S.<br>Department of Civil and Environmental Engineering<br>Engineering and Computer Science<br>Civil Engineering MS
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O'Sickey, Matthew J. "Characterization of Structure-Property Relationships of Poly(urethane-urea)s for Fiber Applications." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26792.
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Poly(urethane)s and poly(urethane-urea)s (PUU) are nearly ubiquitous, having been in existence since before the Second World War. Spandex, a poly(urethane-urea) elastomeric fiber, is found in nearly all articles of apparel as well as in an increasing array of other consumer items. The technology and chemistry of spandex is largely unchanged since its inception in the late 1950s, with the majority of spandex employing poly(tetramethylene ether glycol) as soft segments. Recent developments in catalyst technology have resulted in the production of ultra-low monol content poly(propylene glycol) (PPG), which is nearly difunctional (f=1.95+). This enhancement in difunctionality has potentially enabled the use of PPG as a spandex soft segment with potential spandex processing, performance, and economic benefits.
PPG-based spandex elastomers were evaluated in both film and fiber form for the purpose of investigating morphological, orientational, mechanical, and thermal properties with the goal of understanding relationships between chemistry, morphology and properties. Key variables of interest were soft segment molecular weight (MW), molecular weight distribution (MWD), and composition, and hard segment content and composition. Of those, the influence of the molecular weight distribution of the polyol used for soft segments was of foremost interest and had previously been largely neglected during the course of poly(urethane) and poly(urethane-urea) research.
It was found that over the range of PUU compositions suitable for production of spandex, that hard segment content and composition had little effect upon the morphology and thermal and mechanical properties. Appreciable trends as functions of soft segment molecular weight were observed. The soft segment MWD was adjusted through the addition of a low molecular weight homolog of PPG, tri(propylene glycol) (TPG), decreasing the number average soft segment MW. The results of these experiments were contrary to those for variation of soft segment molecular weight. It was determined that the low MW portion of the polyol MWD contributes to the building of hard segments in addition to or in lieu of soft segments.
Incorporation of TPG in the PUUs resulted in larger, presumably less cohesive, hard domains and increased hard segment content. The TPG containing materials had enhanced tensile properties, less permanent set, and less residual orientation after deformation. These materials proved quite comparable to those using PTMEG soft segments.
Comparison of film and fiber PUUs revealed only minor differences, implying that the trends and conclusions drawn from the study of films with spandex-like compositions would also hold for fibers. The key difference between films and fibers is that fibers maintain some residual ordering and orientation due to drawing of the fibers during processing. Of the processing variables investigated, none impacted the morphology as determined from small angle x-ray scattering.
It was concluded, that of the various compositional variables germane to spandex, the polyol MW and MWD played key roles in development of morphology, and hence properties. The role of polyol MWD had been woefully neglected during the development of spandex previously, and was observed to be a critical variable.<br>Ph. D.
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Bahrami, Saeid. "Design, Fabrication and Evaluation of Polyurethane/Gelatin Fiber/Hydrogel Scaffolds for Tendon Tissue Engineering." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS032.pdf.
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Les tendons et les ligaments sont des composants essentiels du système musculo-squelettique liant les os aux muscles et les os entre eux, respectivement. En raison de leur nature à supporter des charges lourdes, ces structures sont susceptibles d’être endommagées. Dans le cas d’une blessure tendineuse ou ligamentaire, les traitements actuels proposés tels que la suture, les autogreffes, les allogreffes, et les xénogreffes ou encore les prothèses ne sont à ce jour pas optimum. En effet, le taux de morbidité, le peu de disponibilité de greffons, le risque de récidive, la faible réussite des greffes, le risque d’infection et d’une réaction inflammatoire intense sont des conséquences et des limitations non négligeables dont il faut tenir compte lorsque ces traitements sont envisagés. Afin de répondre à ces problématiques, les chercheurs se sont peu à peu tournés vers l’ingénierie tissulaire de ces structures. Il s’agit d’une approche visant à améliorer la qualité du processus de guérison tout en restaurant à l’initial la structure et la fonction du tissu à soigner notamment par l’usage de biomatériaux formant une matrice où la régénération aura lieu. Le succès de l’ingénierie tissulaire dans le cadre du tendon repose sur le fait que la matrice mime la matrice extracellulaire (MEC) du tissu natif en termes de structures et de propriétés fonctionnelles. La structure unique et les propriétés intrinsèques des fibres électrospinnées et des hydrogels sont relativement proches de celles des tissus biologiques. De fait, ces matériaux ont largement été utilisés dans la recherche et les sciences biomédicales. Au fil des années, une attention accrue a été dirigée vers le développement de constructions alliant les hydrogels et les fibres électrospinnées en tant que biomatériaux permettant de renforcer leurs propriétés individuelles tout en diminuant leurs défauts intrinsèques. Les travaux de recherches, actuellement menés, visent à produire une matrice biomimétique 3D mêlant des nanofibres de polyuréthane éléctrospinnées alignées avec un hydrogel de gélatine. L’association de ces deux matériaux a pour objectif de promouvoir le comportement de prolifération et de différenciation cellulaire ainsi que la régénération tissulaire. Nous pensons que les résultats de ce projet de recherche vont encourager le développement d’une stratégie de régénération des structures tendineuses prometteuse permettant d’améliorer la réparation du tissu et de sa fonction mais également d’accélérer l’arrivée des technologies basées sur l’ingénierie tissulaire dans les milieux cliniques et commerciaux<br>Tendons and ligaments are the main components of the musculoskeletal system that connect bone to muscle and bone to bone, respectively. Owing to their load-bearing nature, they are prone to injuries. Current treatment options, including suturing, autografts, allografts, xenografts, and prostheses, suffer from several problems. Donor site morbidity, low availability, risk of injury recurrence, poor graft integration, infection transmission, inflammatory response, and high failure rates are the most inherent limitations of the aforementioned therapeutic modalities. To address these limitations, researchers have introduced the tissue engineering (TE) approach which aims improvement the quality of the healing process and fully restores tissue structure and function. The success of the TE strategy relies on the fact that the scaffolds mimic the extracellular matrix (ECM) of native tissues in terms of structural and functional characteristics. Due to the unique structures and properties of electrospun fibers and hydrogels which are similar to natural tissues, they have been widely applied in many biological and biomedical fields. Given that, more and more attentions have been paid to the fiber-hydrogel constructs as biomaterials, aiming to bring their individual superiority into full play as well as remedy their intrinsic defects.The present study aims to produce 3D biomimetic scaffolds based on aligned electrospun polyurethane nanofibers and gelatin hydrogel, which will promote cells behavior and result in tissue regeneration. We believe that the findings of this project will lead to the development of a new tendon regeneration strategy to improve functional tendon repair outcomes and provide the framework for expediting the clinical and commercial translation of our tissue engineering technologies
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Spagnuolo, Michael. "Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine Based Polyurethane Blends for Tissue Engineering Applications." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1304538022.
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Johnson, Cara. "Characterization of Impact Damage and Fiber Reinforced Polymer Repair Systems for Metallic Utility Poles." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5651.
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Previous studies have demonstrated that the behavior of ber reinforced polymers (FRPs) bonded to metallic utility poles are governed by the following failure modes; yielding of the metallic substrate, FRP tensile rupture, FRP compressive buckling, and debonding of FRP from the substrate. Therefore, an in situ method can be devised for the repair of utility poles, light poles, and mast arms that returns the poles to their original service strength. This thesis investigates the e ect of damage due to vehicular impact on metallic poles, and the e ectiveness of externally-bonded FRP repair systems in restoring their capacity. Damage is simulated experimentally by rapid, localized load application to pole sections, creating dents ranging in depth from 5 to 45% of the outer diameter. Four FRP composite repair systems were selected for characterization and investigation due to their mechani- cal properties, ability to balance the system failure modes, and installation e ectiveness. Bending tests are conducted on dented utility poles, both unrepaired and repaired. Nonlinear nite element models of dented and repaired pole bending behavior are developed in MSC.Marc. These models show good agreement with experimental results, and can be used to predict behavior of full-scale repair system. A relationship between dent depth and reduced pole capacity is developed, and FRP repair system recommendations are presented.<br>M.S.<br>Masters<br>Civil, Environmental and Construction Engineering<br>Engineering and Computer Science<br>Civil Engineering; Structures and Geotechnical Engineering
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Surano, Dominic E. "The Effectiveness of Damage Arrestment Devices in Delaying Fastener-Hole Interaction Failures in Carbon Fiber Polyurethane Foam Composite Sandwich Panels Subjected to Static and Dynamic Loading Under Increased Temperatures." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/436.
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A study was conducted to investigate simple, cost-effective manufacturing techniques to delay skin-core delamination, micro-buckling and bearing stress failures resulting from fastener-hole interactions. Composite sandwich panels, with and without damage arrestment devices (DADs), were subjected to monotonic compression at a rate of 5mm per second, and compression-compression fatigue at 50% yield at an amplitude of 65%, under temperatures of 75, 100, 125, 150, 175, and 200 °F.
The sandwiches tested were composed of two-layer cross-weave carbon fiber facesheets, a polyurethane foam core, and an epoxy film adhesive to join the two materials. The most successful method to delay the aforementioned failures involved milling rectangular slots in the foam core perpendicular to the holes and adding three additional layers of carbon fiber cross-weave. For the monotonic cases, the ultimate load increases were 97, 87, 100, 131, 96, and 119% for each of the respective temperatures listed above with a negligible weight increase. For the fatigue cases, the number of cycles for each test case was nearly identical. This still represents a large improvement because the yield used in the loading condition for the specimens with DADs was 97% greater than the specimens without DADs.
The experimental results were compared with a finite element model (FEM) built in Abaqus/CAE. The numeric and experimental results showed a strong correlation. All test specimens were manufactured and tested in the California Polytechnic State University Aerospace/Composites Laboratory.
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Garbin, Daniel Fernando. "Efeito do material da face nas propriedades mecânicas de painéis sanduíche para aplicação rodoviária." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/157831.
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Painéis sanduíche são largamente utilizadas em diversas aplicações de engenharia e o estudo de suas propriedades é fundamental para a ampliação de sua utilização. Neste trabalho, foram estudados painéis sanduíche com núcleo de poliuretano e faces de fibra de vidro fabricados pelo processo de laminação contínua. Na primeira configuração, as faces do painel foram fabricadas com manta de fibra de vidro e resina poliéster, com 39% de teor de vidro em massa e espessura de 1,9 mm. Na segunda configuração, as faces do painel foram fabricadas com tecido de fibra de vidro e resina poliéster, com 54% de teor de vidro em massa e espessura de 1,2 mm. Realizou-se o cálculo das propriedades mecânicas de cada compósito no programa MECH-Gcomp. As propriedades do núcleo foram retiradas, inicialmente, da literatura. Então, foi possível realizar a avaliação dos painéis pelo método dos elementos finitos utilizando elementos sólidos, comparando o comportamento dos dois tipos de painéis em relação aos carregamentos de compressão de núcleo, de compressão longitudinal e de flexão. Foram realizados ensaios nas faces isoladas e também nos painéis sanduíche completos. Para as faces, os ensaios foram de teor mássico de fibra de vidro, tração, compressão e cisalhamento Iosipescu, conforme as normas ASTM D5630, D3039/D3039M, D6641/D6641M e D7078/D7078M, respectivamente. Já para os painéis sanduíche, foram realizados os ensaios de compressão de núcleo, compressão longitudinal (edgewise) e cisalhamento do núcleo utilizando flexão, conforme as normas ASTM C365/C365M, C364/C364M e C393/C393M, respectivamente. Após os ensaios, foram calibrados os modelos do MEF, permitindo que os mesmos possam calcular outras configurações similares de painel sanduíche. Foi utilizado o programa Autodesk Simulation Composite Design para realizar a validação do ensaio de cisalhamento do núcleo. Concluiu-se que a análise de elementos finitos foi confiável em representar de forma realista o comportamento dos painéis sanduíche e a redução na espessura das faces do painel pode ser compensada com o aumento da sua resistência mecânica e rigidez por meio do aumento no teor mássico de reforço e trabalhando com a orientação do mesmo.<br>Sandwich panels are widely used in a variety of engineering applications and the study of their properties is fundamental for the expansion of their use. In this work, we studied sandwich panels with polyurethane core and fiberglass faces manufactured by the continuous lamination process. In the first configuration, the panel faces were made of fiberglass and polyester resin, with 39% glass content by mass and 1.9 mm thickness. In the second configuration, the panel faces were fabricated from fiberglass fabric and polyester resin, with 54% glass content by mass and 1.2 mm thickness. The mechanical properties of each composite were calculated in the MECH-Gcomp software. The properties of the core were initially taken from the literature. Then, it was possible to evaluate the panels by the finite element method using solid elements, comparing the behavior of the two types of panels in relation to the core compression loads, edgewise compression and bending. Tests were performed on the faces and also on the complete sandwich panels. For the faces, the tests were fiberglass mass content, tensile, compression and Iosipescu shear, according to ASTM D5630, D3039/D3039M, D6641/D6641M and D7078/D7078M, respectively. For sandwich panels, core compression, edgewise compression and core shear using bending tests were performed according to ASTM C365/C365M, C364/C364M and C393/C393M, respectively. After the tests, the FEM models were calibrated, allowing them to calculate other similar sandwich panel configurations. It was used Autodesk Simulation Composite Design software to validate the core shear test. It was concluded that the analysis of finite elements was reliable in realistically representing the behavior of the sandwich panels and the reduction in the thickness of the panel faces can be compensated with the increase of its mechanical resistance and stiffness by increasing the mass content of reinforcement and working with the orientation of the same.
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Neira, Dorivalda Santos Medeiros. "Desenvolvimento de um comp?sito de espuma r?gida de poliuretana de mamona e fibras de sisal para isola??o t?rmica." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15573.
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consumption is a great challenge in the field of insulation materials. In this context,
composites manufactured from vegetal sources are an alternative technology. The principal
objectives of this work are the development and characterization of a composite composed by
the rigid polyurethane foam derived from castor oil (commercially available as RESPAN D40)
and sisal fibers. The manufacture of the composite was done with expansion controlled inside
a closed mold. The sisal fibers where used in the form of needlepunched nonwoven with a
mean density of 1150 g/m2 and 1350 g/m2. The composite characterization was performed
through the following tests: thermal conductivity, thermal behavior, thermo gravimetric
analysis (TG/DTG), mechanical strength in compression and flexural, apparent density, water
absorption in percentile, and the samples morphology was analyzed in a MEV. The density
and humidity percentage of the sisal fiber were also determined. The thermal conductivity of
the composites was higher than the pure polyurethane foam, the addition of nonwoven sisal
fibers will become in a higher level of compact foam, reducing empty spaces (cells) of
polyurethane, inducing an increase in k value. The apparent density of the composites was
higher than pure polyurethane foam. In the results of water absorption tests, was seen a higher
absorption percent of the composites, what is related to the presence of sisal fibers which are
hygroscopic. From TG/DTG results, with the addition of sisal fibers reduced the strength to
thermal degradation of the composites, a higher loss of mass was observed in the temperature
band between 200 and 340 ?C, related to urethane bonds decomposition and cellulose
degradation and its derivatives. About mechanical behavior in compression and flexural,
composites presented a better mechanical behavior than the rigid polyurethane foam. An
increase in the amount of sisal fibers induces a higher rigidity of the composites. At the
thermal behavior tests, the composites were more mechanically and thermally resistant than
some materials commonly used for thermal insulation, they present the same or better results.
The density of nonwoven sisal fiber had influence over the insulation grade; this means that,
an increaser in sisal fiber density helped to retain the heat<br>A busca por alternativas tecnol?gicas sustent?veis e, sobretudo que venham a
contribuir para economizar energia, apresenta-se como um crescente desafio no campo dos
materiais para isola??o t?rmica. Nesse contexto, os comp?sitos fabricados com mat?ria-prima
de fontes renov?veis surgem como uma alternativa tecnol?gica. Os principais objetivos deste
trabalho foram o desenvolvimento e a caracteriza??o do comp?sito formado pela espuma
r?gida de poliuretana derivada de ?leo de mamona (dispon?vel comercialmente e denominada
RESPAN D40?) - e fibras de sisal. O processamento do comp?sito foi feito com expans?o
controlada em um molde fechado. As fibras de sisal foram utilizadas na forma de mantas
agulhadas com gramatura m?dia de 1150 g/m2 e de 1350 g/m2. A caracteriza??o do comp?sito
foi realizada atrav?s dos seguintes ensaios: condutividade t?rmica, desempenho t?rmico,
an?lise termogravim?trica (TG/DTG), resist?ncia mec?nica em compress?o e em flex?o,
densidade aparente, porcentagem de absor??o de ?gua e avalia??o morfol?gica por
Microscopia Eletr?nica de Varredura (MEV). A gramatura e a porcentagem de umidade das
fibras de sisal tamb?m foram determinadas. Os resultados dos ensaios foram comparados aos
da espuma de poliuretana pura. A condutividade t?rmica dos comp?sitos foi maior que a da
espuma pura, ou seja, a adi??o das mantas de sisal induziu um maior grau de compacta??o da
espuma, reduzindo os espa?os vazios (c?lulas) da poliuretana, induzindo eleva??o do k. A
densidade aparente dos comp?sitos foi maior que a densidade da espuma de poliuretana pura.
Nos resultados do ensaio de absor??o de ?gua observou-se uma maior porcentagem de
absor??o dos comp?sitos, o que est? relacionado ? presen?a das fibras de sisal que s?o
higrosc?picas. A adi??o das fibras de sisal tamb?m diminuiu a resist?ncia ? degrada??o
t?rmica dos comp?sitos. Houve uma maior perda de massa do comp?sito na faixa de
temperatura entre 200 e 340?C, relacionada ? decomposi??o das liga??es uret?nicas e a
degrada??o da celulose e de seus derivados. Na avalia??o mec?nica em compress?o e flex?o,
os comp?sitos apresentaram melhor desempenho mec?nico que a espuma r?gida de
poliuretana. O aumento do conte?do de fibras induziu um aumento na rigidez dos comp?sitos.
Nos ensaios de desempenho t?rmico, os comp?sitos foram mais resistentes termicamente, ou
seja, pode-se concluir que os mesmos podem ser usados como material de isolamento t?rmico
em sistemas na faixa de temperatura entre 60 e 110?C, pois apresenta desempenho t?rmico e
mec?nico semelhante, ou melhor, que alguns materiais comumente utilizados para fins de isola??o t?rmica. A gramatura da manta de sisal influenciou o grau de isolamento t?rmico,
isto ?, o aumento da densidade de fibras ajudou na reten??o do calor
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Abeysinghe, Mudiyanselage Chanaka Madushan Abeysinghe. "Static and dynamic performance of lightweight hybrid composite floor plate system." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/60323/1/Chanaka_Abeysinghe_Mudiyanselage_Thesis.pdf.
Full textAbstract:
In the modern built environment, building construction and demolition consume a large amount of energy and emits greenhouse gasses due to widely used conventional construction materials such as reinforced and composite concrete. These materials consume high amount of natural resources and possess high embodied energy. More energy is required to recycle or reuse such materials at the cessation of use. Therefore, it is very important to use recyclable or reusable new materials in building construction in order to conserve natural resources and reduce the energy and emissions associated with conventional materials. Advancements in materials technology have resulted in the introduction of new composite and hybrid materials in infrastructure construction as alternatives to the conventional materials. This research project has developed a lightweight and prefabricatable Hybrid Composite Floor Plate System (HCFPS) as an alternative to conventional floor system, with desirable properties, easy to construct, economical, demountable, recyclable and reusable. Component materials of HCFPS include a central Polyurethane (PU) core, outer layers of Glass-fiber Reinforced Cement (GRC) and steel laminates at tensile regions. This research work explored the structural adequacy and performance characteristics of hybridised GRC, PU and steel laminate for the development of HCFPS.
Performance characteristics of HCFPS were investigated using Finite Element (FE) method simulations supported by experimental testing. Parametric studies were conducted to develop the HCFPS to satisfy static performance using sectional configurations, spans, loading and material properties as the parameters. Dynamic response of HCFPS floors was investigated by conducting parametric studies using material properties, walking frequency and damping as the parameters. Research findings show that HCFPS can be used in office and residential buildings to provide acceptable static and dynamic performance. Design guidelines were developed for this new floor system. HCFPS is easy to construct and economical compared to conventional floor systems as it is lightweight and prefabricatable floor system. This floor system can also be demounted and reused or recycled at the cessation of use due to its component materials.
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Abidin, Mohd Hanafiah Bin. "Fatigue behaviour of glass fibre reinforced polyurethane acrylate." Thesis, Swansea University, 2002. https://cronfa.swan.ac.uk/Record/cronfa42552.
Full textAbstract:
A comprehensive study of the fatigue behaviour of a polyurethane acrylate resin and glass fibre reinforced composites has been undertaken. In the first part, three types of resins were tested: polyurethane vinyl ester, polyester and polyurethane acrylate, which was formulated to have superior properties. Three different types of glass fibre cloth were used for reinforcement, a woven roving and two novel stitch bonded Ulticloths. The [0/90]2s and [+/-45]2s lay-ups were prepared in order to investigate the effects of matrix, cloths and lay-up on fatigue strength and life time. Polyurethane acrylate composites proved to be superior to the polyester resin. The study on damage mechanisms also showed that the first damage was matrix cracking followed by interfacial failure, debonding, delamination and fibre facture which accumulate from the initial cycles until failure. The second part of this study concentrated only on polyurethane acrylate resin reinforced with Ulticloth [90/0]2s and Biaxial Ulticloth [+/-45]4 lay-ups. The data were produced to compare the effect of environment such as air, distilled water and seawater on the composite with tension-tension and tension-compression loading. With the [90/0]2s lay-up the fatigue strength and lifetime were reduced by the presence of distilled water and seawater. Once again, during fatigue testing with R=0.1, microscopic observations showed that these composites suffered severe damage. Samples tested in seawater had more damage compared with samples tested in air and distilled water. The last part of this research was to investigate the modulus degradation during the fatigue life. This investigation revealed that the modulus degradation on all laminates was dependent on stress ratio and lay-up. The modulus of [90/0]2s lay-ups was degraded during fatigue tests and this modulus degradation curve could be divided into three stages. The most clear damage occurring in [+/-45]4 was delamination which happened at both types of stress ratio, R=0.1 and R=-l. Analysis of some microscopic fractography has been carried out to support the observations.
Book chapters on the topic "Polyurethane fiber"
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Gooch, Jan W. "Polyurethane Fiber." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9243.
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Sharma, Anurag, and Sunil C. Joshi. "Fiber-Reinforced Polyurethane Matrix Composites for Engineering Applications." In Polyurethanes: Preparation, Properties, and Applications Volume 1: Fundamentals. American Chemical Society, 2023. http://dx.doi.org/10.1021/bk-2023-1452.ch006.
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Karaeva, A. R., N. V. Kazennov, V. Z. Mordkovich, S. A. Urvanov, and E. A. Zhukova. "Carbon Fiber-Reinforced Polyurethane Composites with Modified Carbon–Polymer Interface." In Proceedings of the Scientific-Practical Conference "Research and Development - 2016". Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62870-7_44.
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Hsieh, K. H., S. T. Lee, D. C. Liao, D. W. Wu, and C. C. M. Ma. "Glass-Fiber Composites from Polyurethane and Epoxy Interpenetrating Polymer Networks." In Interpenetrating Polymer Networks. American Chemical Society, 1994. http://dx.doi.org/10.1021/ba-1994-0239.ch021.
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Rajkumar, K., K. Ramraji, M. Rajesh, and M. Rajiv kumar. "Dynamic Mechanical Analysis of Flax Fiber Stacked Polyurethane Blend Epoxy Composites." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4745-4_42.
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Kaur, Jaspreet, Dharmpal Deepak, Harnam Singh Farwaha, Sulakshna Dwivedi, and Nishant Ranjan. "Development and Mechanical Characterization of Coir Fiber-Based Thermoplastic Polyurethane Composite." In Additive Manufacturing of Polymers for Tissue Engineering. CRC Press, 2022. http://dx.doi.org/10.1201/9781003266464-8.
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Alhanish, Atika, and Mustafa Abu Ghalia. "Investigating the Recent Development of Bio-based Polyurethane Foam Produced from Renewable Resources." In Eco-Friendly Adhesives for Wood and Natural Fiber Composites. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4749-6_12.
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Sharma, K. V., and M. Sripathy. "Comparative Studies of Crushing Behavior of Various Fiber Reinforced Skin Polyurethane Foam Cored Composite Sandwich Structures." In Characterization of Minerals, Metals, and Materials. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118371305.ch46.
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Arrubla Agudelo, L. R., N. T. Simonassi, L. F. Fortunato de Freitas, C. M. Fontes Vieira, H. A. Colorado Lopera, and F. Perissé Duarte Lopes. "Towards Sustainable Construction: Characterization of Vegetable Polyurethane Composite Reinforced with Fique Fiber for Warm and Humid Environments." In The Minerals, Metals & Materials Series. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-81190-6_3.
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Dulcey-Diaz, D. C., O. Lengerke-Pérez, A. D. Rincón-Quintero, C. L. Sandoval-Rodriguez, C. G. Cardenas-Arias, and C. A. Castañeda-Flórez. "Characterization of Mechanical Properties of Materials Composed of Epoxy Resin Reinforced with Carbon Fiber and Polyurethane Foam, Epoxy Resin Reinforced with Carbon Fiber and Aluminum Honey-Comb and Polyester Resin Reinforced with Glass Fiber with Polyurethane Foam for an Electric Sports Vehicle for Academic Purposes." In Artificial Intelligence, Computer and Software Engineering Advances. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68080-0_30.
Full textConference papers on the topic "Polyurethane fiber"
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Vokshi, Eri. "FRP Composites Used to Strengthen and Protect Damaged Reinforced Concrete Structures." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07576.
Full textAbstract:
Abstract While Fiber-reinforced polymer (FRP) composites have been used for decades in aerospace and manufacturing application, the use of such systems for rehabilitation of existing structures is more recent. In most cases, rehabilitation of existing structures occurs due to concrete spalling caused by extensive rebar corrosion. It has been shown through numerous experimental and analytical studies that externally-bonded FRP composites can be applied to not only improve structural performance criteria but also the durability of members. This report presents the findings of a research performed at University of Central Florida which focused on performance of large scale concrete beams damaged prior to repair with FRP. Two types systems were tested: epoxy and polyurethane based carbon fiber system. Results show that both systems increase flexural capacity of concrete reinforced beams. In addition, data shows that while polyurethane matrices are typically characterized by lower shear and tensile strengths, results demonstrate that the flexibility of the polyurethane matrix as a primer is advantageous in spreading the bond stresses over a larger area compared with epoxy composites.
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Schwartz, Peter. "21ST Century Underground Steel Tank Protection Today." In CORROSION 1997. NACE International, 1997. https://doi.org/10.5006/c1997-97583.
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Abstract Breakthroughs in 100% solids polyurethane coating technology have produced higher performing, non-flammable polyurethane coatings with 2000+ PSI adhesion to steel without primers and zero VOC’s. These coatings have produced environmentally friendly solutions to anti-corrosion tank protection while meeting the requirements of Underwriters Laboratories standards UL 1746 Part II and Part IV. They offer high physical properties and substantial performance, safety and environmental advantages over older systems and existing Fiber-glass Reinforced Polyester (FRP) systems. The paper briefly reviews the history of under-ground steel tank anti-corrosion protection and discusses Underwriters Laboratories UL 1746, Part I, Part II and Part IV standards. It highlights the newest standard, Underwriters Laboratories UL 1746, Part IV and the advantages of systems that meet this new standard.
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Marwa, Vicent, Baraka Kichonge, Juma Rajabu Selemani, and Thomas Kivevele. "Simulation and Experimental Performance Analysis of Portable Locally-Made Solar-Powered Cooler for Vaccine Storage." In Africa International Conference on Clean Energy and Energy Storage. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-dld9ew.
Full textAbstract:
Poor storage conditions, particularly exposure to extreme temperatures, can significantly compromise vaccine efficacy, making them ineffective or harmful. This highlights the urgent need for adequate storage infrastructure and monitoring systems, especially in remote areas with limited healthcare resources. This study evaluates the performance of a locally-made solar-powered cooler designed for vaccine storage in such environments. A digital AKO thermostat was integrated to control the compressor according to specified temperature limits, alongside a data logger for continuous temperature monitoring and a fluke device for DC and voltage measurements. The experimental results, validated against existing literature, were reliable and accurate. Key findings reveal that the cooler can reduce temperature to -14.9°C within 180 minutes, surpassing the performance of previous models that attained a temperature of -10°C after 144 minutes. The optimal insulation thickness for maintaining a cooling temperature of -15°C was determined to be 0.07 m using polyurethane insulation material, compared to 0.129 m with Feather Fiber, reflecting a 45.7% increase in efficiency at an ambient temperature of 42°C. Similar results were observed at an ambient temperature of 32°C. Modeling outcomes provided valuable guidance for the experimental design and comparative analysis.
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Iezzi, Erick B., and Grant C. Daniels. "Selective Degradation and Removal of Silyl-Containing Topcoats from Non-Metallic Substrates Using Environmentally Friendly Fluoride Salts." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18797.
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Abstract The topcoat and primer used on the exterior of Department of Defense (DoD) assets (e.g., aircraft, vehicles) are currently removed using harsh chemicals, abrasive materials, or thermal treatments. All of these methods generate hazardous waste, are labor intensive, and consume resources. Chemical stripping is one of the most effective methods of coating removal, especially on large assets, yet it remains the most hazardous to individuals due to the potential for dermal and inhalation exposure of toxic chemicals. Additionally, none of these methods can selectively remove the topcoat from the underlying non-metallic substrate (e.g., anti-corrosive epoxy primer, carbon-fiber reinforced composite) without damaging or completely removing the substrate. At the Naval Research Laboratory (NRL), we have develop stimuli-responsive silyl-containing topcoats that demonstrate similar thermal, mechanical, and performance properties (e.g., weatherability) as the high-performance polyurethane topcoats used on the exterior of Navy aircraft and support equipment, respectively. Unlike current DoD topcoats, these silyl-containing coatings can be selectively degraded and removed (i.e., stripped) from an underlying and strongly adhered non-metallic substrate, such as an anti-corrosive epoxy primer, using an environmentally friendly fluoride salt composition and without damaging the chemical structure of the substrate.
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Nava, Hildeberto, and Nelson Douglass. "High Strength One Component Hybrid Urethane Resin System for Infrastructure Applications." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05511.
Full textAbstract:
Abstract In recent years Urethane Hybrid systems have become very important in the growth of the thermosetting plastics industry. Their practical economical and technical advantages have made it easier for their implementation in conventional molding practices. Their adaptability to common formulations where unsaturated polyester or urethanes are used, provide simple systems that can be processed with fast reaction times and high filler loadings. The resultant products can be designed to have excellent toughness and elongation compared to common unsaturated polyesters. Typically, Polyurethane systems are based on a two part component – a polyol and an isocyanate- that have to be mixed at the time of processing. The challenge however, remains on preparing urethane hybrids that can be formulated as one component system with long storage stability and excellent reactivity. This paper describes a novel one component hybrid urethane system that provides high reactivity and excellent impact strength and toughness. This new approach eliminates the problem of mixing the two components – polyol and isocyanate- that leads to short pot-life due to viscosity build up. In conventional open bath system for pultrusion, the viscosity builds to a point where the pull force exceeds the equipment’s capabilities preventing further processing of the materials. The new system is designed for pultrusion and close molding applications that demand enhanced mechanical properties. The resin is formulated to provide finished products with smooth low-profile like surface which exhibit unique fiber hiding capability. The material combines features required for processing that includes low viscosity, excellent fiber wetting and high reactivity.
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Fleming, Simon, Maryanne Large, and Alessio Stefani. "Polyurethane Optical Fiber Sensors." In Optical Sensors. OSA, 2019. http://dx.doi.org/10.1364/sensors.2019.sth5a.1.
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Runge, Antoine F. J., Alessio Stefani, Richard Lwin, and Simon C. Fleming. "Wearable polyurethane optical fiber based sensor for breathing monitoring." In Optical Fiber Sensors. OSA, 2018. http://dx.doi.org/10.1364/ofs.2018.the75.
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Kaysir, Md Rejvi, Alessio Stefani, Richard Lwin, and Simon Fleming. "Flexible optical fiber sensor based on polyurethane." In 2017 Conference on Lasers and Electro-Optics - Pacific Rim (CLEO-PR). IEEE, 2017. http://dx.doi.org/10.1109/cleopr.2017.8118780.
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Engelbrecht, R., K. Rostan, J. Weiland, M. Luber, A. Schiebahn, and U. Reisgen. "Modal Distribution in Polymer Optical Fibers as Sensor for Load Monitoring in Semi-Structural Adhesive Bonds." In Optical Fiber Sensors. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofs.2022.w2.3.
Full textAbstract:
PMMA polymer optical fibers embedded in semi-structural polyurethane adhesive bonds serve as economical load sensor for structural health monitoring by evaluating load-dependent optical transmission as well as modal distribution measured by a far-field camera. Scaling of sensor quantities by the sensitive fiber length is shown.
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Rahman, Mosfequr, F. N. U. Aktaruzzaman, Saheem Absar, Aniruddha Mitra, and Awlad Hossain. "Finite Element Analysis of Polyurethane Based Composite Shafts Under Different Boundary Conditions." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37753.
Full textAbstract:
Depending on the type of matrix materials, composites can be broadly divided into three different major classifications: Organic-matrix composites (OMC), metal-matrix composites (MMC), and ceramic-matrix composites (CMC). OMC can be further sub-classified into polymer-matrix composites (PMC) and carbon-matrix composites or carbon-carbon composites. In this paper the main objective is to focus on polyurethane based PMC composites. Polyurethane is one of the widely used polymer matrix materials. It has diversified applications, easily available and cheap. In this computational study a composite shaft with a core made of matrix material completely wrapped around by a woven fiber cloth with a very strong bonding between core and fibers is considered. Three different types of woven fibers: fiber glass, Kevlar 49, and carbon fibers, are considered. A woven fabric is the interlocking or weaving of two unidirectional fibers. This configuration is often used to produce curve surfaces because of the ease with which it could be placed on and conform to curved surfaces. Authors had fabricated these three composites in their in-house laboratory. They had also experimentally measured the mechanical properties of these composites using 3-point bending test which already been published. In this current study finite element analyses has been performed for the modeling of the static response of these three different polyurethane based composite shafts as fiber glass reinforced polyurethane epoxy, carbon fiber reinforced polyurethane epoxy, and Kevlar fibers reinforced polyurethane epoxy for three different boundary conditions. These three boundary conditions are simply supported, cantilever, both end fixed types with bending loads applied at the middle for simply supported case and distributed load along the length of the shaft for the last two types of boundary conditions. A three dimensional model of the composite beam has been implemented in this study using SolidWorks. A finite element commercial software ANSYS is used to investigate the stress response and deformation behavior of the model geometry for these three polyurethane based composite shafts for these three boundary conditions. A twenty node three dimensional element has been implemented for the finite element formulation of the modeled geometry such that it is applicable for the analysis of a layered composite structure, while providing support for linear, large rotation, and large strain nonlinear loading conditions. Convergence has also been ensured for various mash configurations in this work.
Reports on the topic "Polyurethane fiber"
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Dippold, Marcel, Makrina A. Chairopoulou, Maximilian Drexler,, Michael Scheiber, and Holger Ruckdäschel. From vibrating molecules to a running shoe: connecting dielectric properties with process feedback in radio-frequency welding of TPU bead foams. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.pfm.1.
Full textAbstract:
Besides new material solutions, innovative processing technologies are key for working towards a more sustainable future for bead foam products. Compared to standard steam chest molding, innovative radio frequency (RF) welding shows great potential based on its direct energy input, which results in reduced energy consumption. Thus, the present study provides fundamental insights into the correlation of dielectric properties of expanded thermoplastic polyurethane (ETPU) bead foams with the processing behavior. Impedance spectroscopy is used to analyze the complex relative permittivity 𝜀𝜀!∗ of both polymer and respective beads. The dielectric properties of polymers are dictated by their molecular structure and hence resulting dipoles. Thus, significant dependency on temperature and frequency is observed due to changes in chain flexibility and therefore alignment with the oscillating electromagnetic field. As cellular structures, the introduction of a second air phase leads to generally attenuated values at equal trends. Within the RF process, changes, predominantly in the imaginary part of 𝜀𝜀!∗ from initial starting temperatures up to welding, are directly reflected in the power curve as process feedback. Furthermore, temperature evolution and derived heating rate within the bead foams demonstrate excellent conformity with previous results with minor deviations due to the thermal inertia of the fiber optic temperature sensor.
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Noise Absorption Behavior of Aluminum Honeycomb Composite. SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0453.
Full textAbstract:
Natural fibers are one of the major ways to improve environmental pollution. In this study experimental investigation and simulation of honeycomb filled with cotton fabric, wood dust and polyurethane were carried out. This study determines the potential use of cotton fabric, wood dust as good sound absorbers. Automotive industries are looking forward to materials that have good acoustic properties, lightweight, strong and economical. This study provides a better understanding of sound-absorbing material with other mechanical properties. With simulation and experimental results, validation of works provides a wider industrial application for the interior of automotive industries including marine, aviation, railway industry and many more.