Academic literature on the topic 'UV curable composites'

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Journal articles on the topic "UV curable composites"

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Kozakiewicz, Janusz, Jarosław Przybylski, Bartosz Hamankiewicz, et al. "UV-Cured Poly(Siloxane-Urethane)-Based Polymer Composite Materials for Lithium Ion Batteries—The Effect of Modification with Ionic Liquids." Materials 13, no. 21 (2020): 4978. http://dx.doi.org/10.3390/ma13214978.

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The results of studies on the synthesis and characterization of conductive polymer composite materials designed as potential separators for lithium ion batteries are presented. The conductive polymer composites were prepared from UV-cured poly(siloxane-urethanes)s (PSURs) containing poly(ethylene oxide) (PEO) segments and modified with lithium salts and ionic liquids (ILs). The most encouraging results in terms of specific conductivity and mechanical properties of the composite were obtained when part of UV-curable PSUR prepolymer was replaced with a reactive UV-curable IL. Morphology of the composites modified with ILs or containing a standard ethylene carbonate/dimethyl carbonate mixture (EC/DMC) as solvent was compared. It was found that the composites showed a two-phase structure that did not change when non-reactive ILs were applied instead of EC/DMC but was much affected when reactive UV-curable ILs were used. The selected IL-modified UV-cured PSUR composite that did not contain flammable EC/DMC solvent was preliminarily tested as gel polymer electrolyte and separator for lithium ion batteries.
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Pérez-de-Eulate, Natalia Gutiérrez, Patricia Ares Elejoste, Garazi Goenaga, et al. "On the Influence of Flame-Retardant Additives on UV-Curable Thermosetting Glass Fiber-Reinforced Composites." Polymers 15, no. 1 (2023): 240. http://dx.doi.org/10.3390/polym15010240.

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One of the main advantages of fiber-reinforced polymer (FRP) composites is the ability to reduce their weight while they exhibit exceptional properties such as high strength, stiffness, and resistance to corrosion, and reduction in their lifetime maintenance when they are compared to the metallic components. These features led fiber-reinforced polymer composites to have applications in the mechanical, construction, aerospace, automotive, medical, marine, and other manufacturing industries. However, the use of this type of material is not possible in all of these applications since, in certain sectors, the fire resistance property that the material must present is one of the key factors. For this reason, a thermosetting resin composed of ultraviolet (UV)-curable acrylic monomers has been used as a matrix, where transparent aluminum trihydrate (ATH) flame-retardant fillers were incorporated for manufacturing flame-retarded UV-curable composites. The composite parts were produced by using glass fiber-reinforced UV-curable prepregs. An exhaustive study of different types of ATH-based flame-retardant additives and the possible cooperation between them to improve the fire properties of the UV-curable composite was carried out. Additionally, the most suitable additive percentage to meet the railway sector requirements was also evaluated, as well as the evolution in the viscosity of the matrix and its processing capacity during the manufacture of the prepregs at 60 °C. The compatibility between the fillers and the matrix was assessed using a dielectric analysis (DEA). The fire properties of both the matrix and the final composite were established.
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Fu, Yijia, Wendong Li, Man Xu, Chao Wang, Liyuan Zhang, and Guanjun Zhang. "Dielectric Properties and 3D-Printing Feasibility of UV-Curable Resin/Micron Ceramic Filler Composites." Advances in Polymer Technology 2022 (February 27, 2022): 1–14. http://dx.doi.org/10.1155/2022/9483642.

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To prepare high-permittivity composite materials for dielectrically functional gradient materials (d-FGMs) by the stereolithographic 3D-printing technique, three ceramic powders (i.e., alumina, barium titanate, and strontium titanate) are selected as functional fillers for a UV-curable resin matrix. The viscosity and UV curing depth of the uncured slurry are tested for feasibility of 3D printing. Comprehensive electrical properties, including volume resistivity, permittivity, dielectric loss, and breakdown strength of the cured composites are measured. The effects of the filler types, morphologies, particle sizes, and volume fractions on the UV curing characteristics of the slurry and dielectric properties of cured composites are systematically analyzed. The experimental results show that spherical fillers with large particle sizes, smooth surfaces, and high permittivity are conducive for reducing the slurry viscosity, increasing curing depth and adjusting the composite’s permittivity over a wide range. We believe that the proposed strategy for material system establishment can improve the 3D printability of high-permittivity composites and promote other applications of the d-FGMs by the stereolithography technique.
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Mohan, Denesh, Mohd Shaiful Sajab, Hatika Kaco, Saiful Bahari Bakarudin, and An’amt Mohamed Noor. "3D Printing of UV-Curable Polyurethane Incorporated with Surface-Grafted Nanocellulose." Nanomaterials 9, no. 12 (2019): 1726. http://dx.doi.org/10.3390/nano9121726.

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The recognition of nanocellulose has been prominent in recent years as prospect materials, yet the ineffectiveness of nanocellulose to disperse in an organic solvent has restricted its utilization, especially as a reinforcement in polymer nanocomposite. In this study, cellulose has been isolated and defibrillated as cellulose nanofibrils (CNF) from oil palm empty fruit bunch (EFB) fibers. Subsequently, to enhance its compatibility with UV-curable polyurethane (PU)-based resin, the surface hydrophilicity of CNF has been tailored with polyethylene glycol (PEG), as well as reduced graphene oxide (rGO). The dispersibility of reinforced modified CNF in UV-curable PU was examined through the transmittance interruption of resin, chemical, and mechanical properties of the composite printed using the stereolithographic technique. Evidently, the enhanced compatibility of modified CNF and UV-curable PU was shown to improve the tensile strength and hardness of the composites by 37% and 129%, respectively.
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Czech, Zbigniew, Janina Kabatc, Marcin Bartkowiak, Karolina Mozelewska, and Dominika Kwiatkowska. "Influence of an Alkoxylation Grade of Acrylates on Shrinkage of UV-Curable Compositions." Polymers 12, no. 11 (2020): 2617. http://dx.doi.org/10.3390/polym12112617.

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Commercially available UV curable restorative materials are composed of inorganic filler hydroxyapatite, multifunctional methacrylate, photoinitiator and alkoxylated acrylate. Especially, the application of alkoxylated monomers with different alkoxylation grade allows the reduction of polymerization shrinkage which plays the major role by application of low shrinkage composites as high quality restorative dental materials or other adhesive materials in the form of UV-polymerized self-adhesive acrylics layers (films). There are several ways to reduce polymerization shrinkage of restorative compositions, for example, by adjusting different alkoxylated acrylic monomers, which are integral part of investigated UV curable restorative composites. This article is focused on the studies of contraction-stress measured as shrinkage during UV-initiated curing of restorative composites containing various commercially available alkoxylated acrylates. Moreover, studies with experimental restorative materials and recent developments typical for UV curing technology using special photoreactive monomers are described.
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Patil, Renuka Subhash, Jomin Thomas, Mahesh Patil, and Jacob John. "To Shed Light on the UV Curable Coating Technology: Current State of the Art and Perspectives." Journal of Composites Science 7, no. 12 (2023): 513. http://dx.doi.org/10.3390/jcs7120513.

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The industrial application of UV curable coatings is being widely commercialized at a rapid pace with very diversified product markets. UV curing has existed for many years now, but the new commercial opportunities emerging for sustainable, and climate friendly technologies have driven demand for photo-curable coating systems. It is primarily attributed to its environmentally friendly solvent-free and energy-efficient method. Precedented UV light curable coatings are being commercialized and numerous lamp sources are being extensively studied. In such an era of predominant research evolving the UV curing technology horizon, we attempt to outline the state of the art, opportunities, and challenges. This contribution attempts to highlight, in a comprehensive way, sustainable UV coating on the basis of recent research advancements, existing challenges and prospective scope in this field. With a set of prerequisite foundational knowledge into UV curable coatings and mechanisms, the review has meticulously looked at the recent research advancements. This review contribution attempts to focus on three aspects: the known science behind UV curing coatings, coupled with the recent advancements, and future opportunities.
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Datta, Samali, Maung Htet, and Dean C. Webster. "Cationic UV-Curable Conductive Composites from Exfoliated Graphite." Macromolecular Materials and Engineering 296, no. 1 (2010): 70–82. http://dx.doi.org/10.1002/mame.201000240.

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Nur, Munirah Abdullah, Z. M. Rus A., F. L. Abdullah M., and Abd Wahab Hanani. "Electrical profile of ultra violet (UV) curable renewable polymer graphite (PG) composites." International Journal of Power Electronics and Drive System (IJPEDS) 11, no. 1 (2020): 459–65. https://doi.org/10.11591/ijpeds.v11.i1.pp459-465.

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The electrical profiles of the renewable polymer graphite (PG) composites upon ultra violet (UV) curing were investigated. Renewable PG films were prepared by mixing with varying weight percent of graphite (with an increment of 5 wt. % of prepared graphite) up to 30 wt.% and crosslinker. Then, the composites solution was slip casted and cured upon stimulated UV irradiation (UV accelerated weathering tester) at different time exposure (up to 1000 hours) was applied. Small changes on the functional groups of the composites were observed due to UV exposure time by Fourier Transform Infrared Spectroscopy (FTIR). Suggesting that chemical crosslink and chain scissions occurred within renewable polymer graphite composites. Further electrical profile through two point probe and four point probe method recorded visibly fluctuating values for both resistivity and conductivity within its composites range. Proposed here that the removal of organic contaminants and weak materials form both renewable polymer and graphite particles through the UV curing may have an effect on the formation of conductive network stability.
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Kim, Ryung Il, Ju Ho Shin, Jong Suk Lee, Jung-Hyun Lee, Albert S. Lee, and Seung Sang Hwang. "Tunable Crystalline Phases in UV-Curable PEG-Grafted Ladder-Structured Silsesquioxane/Polyimide Composites." Materials 13, no. 10 (2020): 2295. http://dx.doi.org/10.3390/ma13102295.

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A series of UV-curable hybrid composite blends containing a carboxylic acid functionalized polyimidewith varying amounts of high molecular weight (~1 K) PEG-grafted ladder-structured polysilsesquioxanes copolymerized with methacryl groups were fabricated and their structural, thermal, mechanical, and surface properties characterized. At a composite weight ratio of polyimide above 50 wt.%, a stark shift from amorphous to crystalline polyethylene glycol (PEG) phases were observed, accompanied by a drastic increase in both surface moduli and brittleness index. Moreover, fabricated composites were shown to have a wide range water contact angle, 9.8°–73.8°, attesting to the tunable surface properties of these amphiphilic hybrid polymer composites. The enhanced mechanical properties, combined with the utility of tunable surface hydrophilicity allows for the possible use of these hybrid polymer composites to be utilized as photosensitive polyimide negative photoresists for a myriad of semiconductor patterning processes.
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Chartier, T., C. Hinczewski, and S. Corbel. "UV Curable Systems for Tape Casting." Journal of the European Ceramic Society 19, no. 1 (1999): 67–74. http://dx.doi.org/10.1016/s0955-2219(98)00177-0.

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Dissertations / Theses on the topic "UV curable composites"

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STRONGONE, VALENTINA. "Preparation and characterization of UV-LED curable composite systems based on carbon fillers." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2875751.

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Yang, Ping-Lin, and 楊秉霖. "UV-curable Organic / Inorganic composites PU Resin on Water-repellent Material Surface Treatment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8mqjz4.

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碩士<br>淡江大學<br>化學學系碩士班<br>103<br>A low surface energy and hydrophobic material, Polydimethylsiloxane (PDMS) has been selected to react with isophorone diisocyanate (IPDI) and forming a NCO-terminated PDMS-containing Polyurethane (PU) prepolymer, it then reacts further with 2-hydroxyethyl methacrylate (HEMA) and results in a formation of acrylate-terminated PDMS-containing PU oligomer. It is compounded with hydrophobic long-chain hydrocarbon (its carbon number more than 16 and that is similar to wax) acrylate (monomer) and becomes UV-curable hydrophobic PU coating material. Nano-particles are generated from a sol-gel process by mixing tetra-ethyl siloxane (TEOS) and 3-(trimethyyloxysilyl)propyl methacrylate (TESPMA) that creates even rough surface and that increases water-resistance on the coated hydrophobic textile surface after UV-curing process. Hydrophobic textile treatment: A refined PET textile (treated with diluted NaOH solution and cleaned with de-ionized water) is treated with UV-curable hydrophobic PU oligomers and cured with UV-radiation or heating. The results of hydrophobic treated textiles are evaluated by AATCC testing methods.
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Chang, Yu-Hao, and 張育豪. "UV-Curable Hydrophilic Aqueous-base PU Nano-composites for wettable PET Textile Treatment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/58592121644632604382.

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碩士<br>淡江大學<br>化學學系碩士班<br>103<br>Hydrophilic NCO-terminated PU oligomer is obtained from hydrophilic polyethylene glycols-2000(PEG-2000)and dimethylolpropanic acid(DMPA) with isophorone diisocyanate(IPDI). It is reacted further with 3-acryloloxy -2-hydropropyl methacrylate (AHM) and forming UV-curable hydrophilic PU oligomer. DMPA offers COOH hydrophilic center.SiO2/TiO2 hybrids can be formulated within hydrophilic PU oligomers (in situ) before water dispersion. It is dispersed into water phase after neutralized with triethyl amine (TEA) as an aqueous-based dispersion UV-curable hydrophilic PU. This aqueous-based PU includes both thermal curing agent (TMPTA-AZ for ring-opening reaction) and UV-curing recipes (photo-initiator and reactive diluents). Hydrophobic PET textile is treated with aqueous-based dispersion of UV-curable resin and UV-cured with after dry.There are two different curing reactions with this hydrophilic PU coating material taking place: 1. COOH reacts withTMPTA-AZvia a ring-opening reaction.2.UV-curing of acrylated terminal groups PU and reactive diluents.The final cured hydrophilic PU forms inter-penetrating networks (IPN) with PET textile and it results water washing durable hydrophilic textile treatments after 30 washing cycles according to AATCC-135 method. The hydrophilic textile treated with this prepared PU resin,it demonstrate a quick and efficient method to improve the long lasting textile hyrophilicity by thermal and UV-curing dual processes.
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Chang, Chun-Chen, and 張鈞誠. "Preparation and Characterization of UV-curable Polysiloxane-containing PU Composites with Reactive Nano-Silica." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/79707571184480681654.

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碩士<br>淡江大學<br>化學學系碩士班<br>98<br>In this article, two series organic -inorganic nano composites were invetigated and compared with each other. Hybridization of UV-curable Polysiloxane-containg PU composite with surface modified nano-silica particles via glycidyl methacrylate (GMA). A PDMS-containing PU oligomer that is obtained from NCO-terminated PU prepolymer with 2-hydroxyethyl methacrylate. The physical properties (such as gel content, water-uptake, enthanol-uprtake, ect.), the thermal properties (thermalgravimentric analysis and dynamic mechanical analysis), the UV/vis spectra transmittance, and scanning electron microscope (SEM) of the orangic-inorangic nanocomposites were evaluated in this article.
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Hwang, Jing-Zhong, and 黃景忠. "UV-Curable PU / Silica Nano Composite for Surface Coatings." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/84136576410531190223.

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碩士<br>淡江大學<br>化學學系碩士班<br>95<br>In this article, the modification of the aqueous-based polyurethane (PU) is the main target. Firstly, the NCO-terminated aqueous-based PU prepolymer was synthesized from the poly-addition reaction of the diisocyanate (e.g. isophorone diisocyanate, IPDI), polypropylene glycol (PPG) and 2,2’-dimethylolpropanoic acid (DMPA). Following, the 2-hydroxyethyl methacrylate (2-HEMA) was used to react with the NCO-terminated functional groups of the prepolymer to modify it and the UV-curable aqueous-based PU was obtained. The various dosages of nano-Silica (MA-ST, nano-silica with 15 nm diameter and 30 w/w % dispersed in methanol) were hybridized with the UV-curable aqueous-based PU and cured by the UV irradiation to obtain the series of organic/inorganic nano-composites. The physical (such as gel content, water-uptake, solvent resistance, contact angle and etc.), mechanical (such as tensile strength and elongation, Shore-a hardness et al.) and thermal (such as thermogravimetric analysis and dynamic mechanical analysis) properties were evaluated in this article. In addition, the discussion of phase separation was investigated by the scanning electronic microscopy and UV transmittance, in this study.
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王宇洋. "Preparation and Property Characterizations of UV-curable Nano-composite Sealing Resins for OLED Packaging." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/47364522978167414698.

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博士<br>國立交通大學<br>材料科學與工程系所<br>95<br>Preparation and characterizations of the photo-curable organic/inorganic nano-hybrids for OLED packaging are carried out in this study. The experimental works can be classified into two portions: the first is relating to the polymer/clays nanocomposite resins. After clays-modification with synthesized surfactants, the modified clays, or called the acrylateclays were respectively added into photo-curable co-polyacrylate and epoxide resin matrices. The applicability to OLED packaging of epoxide/acrylateclays nanocomposite resin was evaluated by characterizing the lifetime of devices. The second part studies the preparation and characterizations of photo-curable co-polyacrylate/SiO2 nanocomposite material by in-situ sol-gel process. Reliability of OLEDs encapsulated by the co-polyacrylate/SiO2 was also investigated in this part of study so as to evaluate its applicability to OLED packaging. Experimental results revealed that the surfactant synthesis generated five different products. The products containing nitrogen atoms can be acidified and serve as the surfactants to intercalate into clay galleries. It was found that the synthesized surfactants may replace 71.4% of cations in clay lamellas and consequently form the acrylateclays. They effectively enlarged the d-spacing of clay lamellas from 13.6 to 33.2Å according to XRD analysis. The DTG analysis showed that the methylacrylate groups in the synthesized surfactants may react with acrylate/methylacrylate groups in monomers via photo-polymerization process. The photo-crosslinking subsequently promoted the compatibility between organic/inorganic portions. Such an effect led to the formation of nano-scale clay segments with thickness about 60 to 80 nm in co-polyacrylate/acrylateclays resin sample and an intercalated clay structure in epoxide/acrylateclays resin sample, as revealed by the TEM observation. The 5% weight loss temperature (Td) of co-polyacrylate/acrylateclays nanocomposite material was increased up to 16�aC when 5 wt.% of clay was added. The average optical transmittance of co-polyacrylate/acrylateclays resin sample reduced from 88.7% to 76.6% in visible-light wavelength range and the moisture absorption decreased from 3.44% to 1.31%. For epoxide/acrylateclays nanocomposite resin containing 5 wt.% intercalated segments, the Td increased from 149 to 213�aC, the coefficient of thermal expansion (CTE) reduced from 228.9 ppm/�aC to 80.5 ppm/�aC, the average optical transmittance slightly reduced from 86.0% to 83.7%, the moisture absorption decreased from 12.70% to 6.12% and the adhesion strength remained 43.8 kgf/cm2. For the epoxide/acrylateclays nanocomposite applied to OLED packaging, the lifetime of nanocomposite-sealed OLED is two-fold higher than that of acrylate resin-sealed OLEDs. The intercalated clay structure could sufficiently increase the permeation path of moisture, subsequently retarded the degradation of OLEDs. For the photo-curable co-polyacrylate/silica nanocomposite resin containing 10 wt.% nano-sized silica particles, the glass transition temperature (Tg) ascended from 86�aC to 107�aC, the CTE decreased from 99.2 ppm/�aC to 30.6 ppm/�aC, the Td remained 180�aC, the moisture permeability reduced from 13.59 g/m2��24 hrs to 10.41 g/m2��24 hrs, the Young’s modules increased from 9.5 GPa to 265.8 GPa, the adhesion strength improved from 20.2 kgf/cm2 to 42.8 kgf/cm2 and the average optical transmittance changed from 82.3% to 82.0%; besides, at 10 kV/cm its leakage current density greatly diminished from 235 nA/cm2 to 1.3 nA/cm2, the dielectric constant was as low as 3.93 and the tangent loss was 0.0472. By applying co-polyacrylate/silica nanocomposite resin to direct encapsulation of bottom-emitted OLEDs, it found that the curing process did not affect the luminance of encapsulated devices and the device driving voltage decreased from 6.77V to 6.09V due to improved insulation property. Moreover, the lifetime of nanocomposite-encapsulated OLED increased from 178 hrs for resin-encapsulated OLED to 350 hrs for nanocomposite-encapsulated OLED. Experimental analyses indicated that excess UV irradiation may degrade the physical properties of nanocomposite resin such as insulation property and thermal resistance so as to deteriorate the lifetime of devices. Finally, above studies indicate that the dispersion of inorganic fillers and adhesion properties of nanocomposite sealing resins played important roles on the reliability of OLEDs.
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Yu, Hsin-Kai, and 俞欣愷. "Beads-Milling of Waste Si Sawdust into Microflakes and Applied for UV-curable Polystyrene Anticorrosion Composite Coatings." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/784947.

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碩士<br>中原大學<br>化學研究所<br>106<br>This dissertation is mainly focused on the study of polymer composites containing beads milled waste sawdust and applied in anticorrosion application. First of all, the sawdust obtained from cutting of commercially available solar panels was processed by beads-milled procedure by Zr beads of ~ 5 mm in diameter. Subsequently, the photo-polymerization of styrene monomer in the presence of suitable amount of beads-milled sawdust was performed under UV radiation of exposed wavelength of 365 nm, exposed time of 4 hours, exposed distance of 10 cm. The as-prepared polystyrene (PS)/Si sawdust composites were characterized by Fourier transformation infrared (FTIR) spectroscopy. Morphological dispersion of sawdust in PS was studied by scanning electron microscopy (SEM) and EDX. It should be noted that the PS/Si sawdust composites were found to exhibit better anticorrosion performance as compared to that of neat PS based on a series of electrochemical corrosion measurements in saline conditions. According to the test results, the addition of the micro-slice structure of the Si sawdust can effectively improve the corrosion resistance of polystyrene. The polystyrene added with the Si sawdust has increased from the original corrosion protection efficiency from 58.81% to 93.57%, confirming the addition. Si sawdust can prolong the diffusion path of corrosion factor to achieve anti-corrosion effect. The O2 gas permeability of composite membranes was found to lower than that of neat PS membrane, after adding Si sawdust the penetration rate of polystyrene to oxygen decreased from the original 23.64 g/m2-h to 11.55 g/m2-h, which supports the corresponding data of anticorrosion performance of coatings.
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Chang, Ruey-Shiun, and 張瑞勳. "A Study of Formation Conditions and Electro-Optic Properties for UV-Curable Polymer-Ferroelectric Liquid Crystal Composite Films." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/04958200284094079575.

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Chih-Chun, Chenn, and 陳執群. "The study on Formation Conditions and Electrooptical Properties of Dye Guest-Host Ferroelectric Liquid Crystal and the Composite Films of UV Curable Polymer Dispersed-Dye Guest-Host FLC." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/76493723267390250541.

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碩士<br>國立臺灣科技大學<br>纖維及高分子研究所<br>86<br>This study concerns a novel process to disperse blue dichroic dyes (M483)in varying concentrations of ferroelectric liquid crystal (CS-1024) to manufature the display device of Dye Guest-Host Ferroelectric Liquid Crystals(DGHFLC)and produce the new type of Dye Guest-Host Polymer DispersedFerroelectric Liquid Crystals (DGHPDFLC) with a single polarizer. The anisotropic absorption effect of the dichroic dye and the characteristics of low threshold voltage, fast switch speed and wide viewingangle of ferroelectric liquid crystals combined with the processibility of thepolymer were used to investigate the performance and the influence of formationconditions on the cure degree of a polymer matrix and the electro-opticproperties of the Polymer/DGHFLC composite film. Formation conditions includedthe intensity of the UV light and the content of the the prepolymer(NOA65). Our main objective was to resolve the problems of traditional FLC and PDFLCliquid crystal displays, such as low brightness, narrow viewing angle and so on.We used the following equipment: polarizing microscope, polarizingmicro-spectrometer, He-Ne laser, arbitrary waveform generator and digitaloscilloscope to study the physical properties of DGHFLC and DGHPDFLC. The results show that both the addition of dye and the content of thepolymer increase the rotational viscosity of the whole mixed system and lowerresponse time. In addition, it rises the bistability and memory effect of DGHFLCand DGHPDFLC much more than those of ferroelectric liquid crystals. For bothcontrast ratio and the rate of transmitted light the DGHPDFLC is better thanDGHFLC. During the measurement of physical properties, the ferroelectric phasetransition temperature tended to go down after the addition of dye during theexperiment. The results could be attributed to the phase equilibrium of thetwo mixed compounds of dye and liquid crystal which induces little change in theliquid crystal phase transition temperature.
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(9178199), Monique McClain. "ADDITIVE MANUFACTURING OF VISCOUS MATERIALS: DEVELOPMENT AND CHARACTERIZATION OF 3D PRINTED ENERGETIC STRUCTURES." Thesis, 2020.

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<p>The performance of solid rocket motors (SRMs) is extremely dependent on propellant formulation, operating pressure, and initial grain geometry. Traditionally, propellant grains are cast into molds, but it is difficult to remove the grains without damage if the geometry is too complex. Cracks or voids in propellant can lead to erratic burning that can break the grain apart and/or potentially overpressurize the motor. Not only is this dangerous, but the payload could be destroyed or lost. Some geometries (i.e. internal voids or intricate structures) cannot be cast and there is no consistent nor economical way to functionally grade grains made of multiple propellant formulations at fines scales (~ mm) without the risk of delamination between layers or the use of adhesives, which significantly lower performance. If one could manufacture grains in such a way, then one would have more control and flexibility over the design and performance of a SRM. However, new manufacturing techniques are required to enable innovation of new propellant grains and new analysis techniques are necessary to understand the driving forces behind the combustion of non-traditionally manufactured propellant.</p> <p>Additive manufacturing (AM) has been used in many industries to enable rapid prototyping and the construction of complex hierarchal structures. AM of propellant is an emerging research area, but it is still in its infancy since there are some large challenges to overcome. Namely, high performance propellant requires a minimum solids loading in order to combust properly and this translates into mixtures with high viscosities that are difficult to 3D print. In addition, it is important to be able to manufacture realistic propellant formulations into grains that do not deform and can be precisely functionally graded without the presence of defects from the printing process. The research presented in this dissertation identifies the effect of a specific AM process called Vibration Assisted Printing (VAP) on the combustion of propellant, as well as the development of binders that enable UV-curing to improve the final resolution of 3D printed structures. In addition, the combustion dynamics of additively manufactured layered propellant is studied with computational and experimental methods. The work presented in this dissertation lays the foundation for progress in the developing research area of additively manufactured energetic materials. </p> <p>The appendices of this dissertation presents some additional data that could also be useful for researchers. A more detailed description of the methods necessary to support the VAP process, additional viscosity measurements and micro-CT images of propellant, the combustion of Al/PVDF filament in windowed propellant at pressure, and microexplosions of propellant with an Al/Zr additive are all provided in this section. </p>
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Book chapters on the topic "UV curable composites"

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Mantelli, Andrea, Alessia Romani, Raffaella Suriano, Marinella Levi, and Stefano Turri. "Additive Manufacturing of Recycled Composites." In Systemic Circular Economy Solutions for Fiber Reinforced Composites. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-22352-5_8.

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AbstractAn additive remanufacturing process for mechanically recycled glass fibers and thermally recycled carbon fibers was developed. The main purpose was to demonstrate the feasibility of an additive remanufacturing process starting from recycled glass and carbon fibers to obtain a new photo- and thermally-curable composite. 3D printable and UV-curable inks were developed and characterized for new ad-hoc UV-assisted 3D printing apparatus. Rheological behavior was investigated and optimized considering the 3D printing process, the recyclate content, and the level of dispersion in the matrix. Some requirements for the new formulations were defined. Moreover, new printing apparatuses were designed and modified to improve the remanufacturing process. Different models and geometries were defined with different printable ink formulations to test material mechanical properties and overall process quality on the final pieces. To sum up, 3D printable inks with different percentages of recycled glass fiber and carbon fiber reinforced polymers were successfully 3D printed.
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Mitkus, Rytis. "UV Light Curable Piezoelectric 0-3 Composites with Different Piezoceramics." In Mechanics and Adaptronics. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56946-3_5.

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Mitkus, Rytis. "UV Light Curable Piezoelectric 0-3 Composites, Photopolymer Suitability and 3D Printing." In Mechanics and Adaptronics. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-56946-3_4.

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Kumar, Sidhant, Harshit Gupta, and Subhrajit Roy. "3D-Printed UV–Thermal Dual Curable Bio-composite for Carbon–Neutral Building Construction Applications." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7150-9_10.

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Bastani, Saeed, and Masoume Kaviani Darani. "Carbon Nanotube-Based UV-Curable Nanocomposite Coatings." In Carbon Nanotubes - Current Progress of their Polymer Composites. InTech, 2016. http://dx.doi.org/10.5772/62507.

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Uhl, Fawn M., Siva Prashanth Davuluri, Shing-Chung Wong, and Dean C. Webster. "Nanoclay Reinforced UV Curable High-barrier Coatings." In Composite Technologies for 2020. Elsevier, 2004. http://dx.doi.org/10.1016/b978-1-85573-831-7.50122-x.

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Conference papers on the topic "UV curable composites"

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Wang, Hangqian, Zuqiang Wang, Jialin Zhang, Xialei Lv, and Jinhui Li. "Synthesis and Properties Study of Low Dielectric UV Curable Epoxy Resin/Fluorocarbon Composites." In 2024 25th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2024. http://dx.doi.org/10.1109/icept63120.2024.10668565.

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Shaw, J., and T. Wang. "Uv-Led Curable Glass Fiber Composites and their Properties." In CAMX 2022. NA SAMPE, 2022. http://dx.doi.org/10.33599/nasampe/c.22.0168.

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Li, Wen-Dong, Li-Yuan Zhang, Chao Wang, Xiao-Ran Li, Man Xu, and Guan-Jun Zhang. "Dielectric Properties and 3D Printing Fesibility of UV Curable Polymer Composites." In 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8642258.

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Wang, Michael R., Kai Shen, Sarfaraz Baig, Young-hun Paik, Sung Jin Kim, and Guomin Jiang. "Broadband infrared light emitting waveguides based on UV curable PbS quantum dot composites." In Optical Interconnects XVIII, edited by Henning Schröder and Ray T. Chen. SPIE, 2018. http://dx.doi.org/10.1117/12.2287464.

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Sandell, Peter, Christopher Billings, and Yingtao Liu. "Mechanical and Material Characterization of 3d Printed Continuous Fiber Reinforced Photopolymer Matrix Composites." In ASME 2023 Aerospace Structures, Structural Dynamics, and Materials Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ssdm2023-106951.

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Abstract Continuous fiber-reinforced thermoset matrix composite structures play an important role in modern aerospace design due to their extremely high attainable strength-to-weight ratio, but manufacturing processes are often prohibitively expensive for prototyping and small-scale production. This paper presents an additive manufacturing solution based on direct-ink-write technology using UV-curable thermosets to produce in-situ cured continuous fiber composite parts. In-situ UV cure gives this process potential for rapid prototyping in open-air settings, and the direct-ink-write method means it is simple enough to use in small-scale, low-cost applications. Thermosets and carbon fiber are used to show further potential to produce composites using aerospace-grade materials. The manufacturing process is capable of printing geometrically complex parts, like honeycombs, with no tool-up or specialty equipment. Tensile testing analyses of early samples show ultimate tensile strengths of 117 MPa and elastic moduli up to 15 GPa. Further analyses show printed parts having fiber volume fractions in the range of 8.3%. Higher strengths and fiber volume fractions are expected to be feasible as the process matures.
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DOJAN, CARTER, MORTEZA ZIAEE, and MOSTAFA YOURDKHANI. "RAPID AND SCALABLE ADDITIVE MANUFACTURING OF THERMOSET POLYMER COMPOSITES." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36457.

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Additive manufacturing (AM) has recently been transformed into a robust manufacturing paradigm for rapid, cost-effective, and reliable manufacturing of fiberreinforced thermoset polymer composites. Among various AM techniques, direct ink writing (DIW) technique offers exceptional ability for constructing scalable 3D composite structures with a high resolution and rapid production rates. In the conventional DIW technique, composite parts are created by thermal post-curing of a thermoset resin ink in an oven at elevated temperatures to obtain a highly crosslinked polymer network. The long and energy-intensive curing processes often required for curing the monomer limits the applications of this approach to layer-by-layer printing of simple 2D geometries. In addition, the conventional approach is not suited to creating large structures, as the uncured material in the earliest deposited layers reaches a flow state, resulting in loss of print fidelity or even the collapse of printed parts. Alternative in-situ curing approaches during the printing process are promising for highrate and scalable AM of thermoset polymer composites. To date, a handful of AM techniques based on in-situ curing have been developed using UV-curable thermoset resins. However, these techniques are not yet applicable for creating structural components due to the poor mechanical performance of the matrix, as well as incomplete curing of the resin in the presence of light absorbing reinforcements. In this work, we present a novel technique that can realize fast and energy-efficient fabrication of high-performance polymer composites using a thermoresponsive thermoset resin system. Our technique involves feeding resinous inks filled with discontinuous carbon fiber (CF) reinforcements from the nozzle of a printing robot and directing thermal stimulus toward the extruded material. The thermal stimulus is configured to rapidly and locally heat the composite material and instantaneously rigidize the extruded material. Using our novel printing technique, we demonstrate AM of tall composite structures using conventional layer-by-layer printing, which is difficult to achieve using existing techniques. In addition, instantaneous and localized curing of the thermoset matrix resin allows for the manufacturing of freeform structures (in-air printing), eliminating the need for support materials and tooling. We have shown that we can manufacture fully cured, void-free, and high-performance composites with printing speeds up to 1.5 m/min without requiring post‐treatment or post‐curing steps.
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Zheng, Baoluo, Fuxin Qi, Jing Yang, et al. "Fabrication of Er:YAG/Yb:YAG nanopowder-derived Er:Yb co-doped silica fibers from UV–curable composites and their application in 1550-nm fiber lasers." In Fiber Lasers XIX: Technology and Systems, edited by César Jáuregui-Misas and V. R. Supradeepa. SPIE, 2022. http://dx.doi.org/10.1117/12.2614271.

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Warner, Matthew, Tucker McKenzie, Christopher Chamberlain, and Olivia Niitsoo. "DEVELOPMENT OF A COMMERICAL AIRCRAFT CO-CUREABLE SURFACING FILM WITH IMPROVED UVA-RESISTANCE." In SAMPE 2025 Indianapolis. Society for the Advancement of Material and Process Engineering, 2025. https://doi.org/10.33599/nasampe/s.25.0259.

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Some commercial aircrafts employ a co-curable surfacing film that protects the underlying composite materials from UV-degradation during aircraft manufacturing. However, current state-of-the-art surfacing films are prone to UV-damage, resulting in discoloration, potential paint adhesion failure, and the need for time-consuming sanding or other rework process steps to remove the observable damage. The undesirable discoloration, typically yellowing, can be caused by UV degradation of aromatic components found within the surfacing film and the primary structure resins. Hexcel is currently developing a surfacing film for aircraft composite structures that can address this UV-damage in addition to other market needs. Several surfacing film formulations co-cured with primary structure carbon fiber prepreg were fabricated to obtain composite laminates. These UV-protected co-cured laminates were tested to determine their UV resistance by measuring color changes via colorimetry at different UVA exposure doses. One modification to improve UV-resistance improved it by potentially enough to mitigate rework before the paint application process. Additionally, these surfacing film formulations possess excellent chemical resistance before and after UVA exposure, which is a critical aspect of performance. Eliminating surface preparation operations with UVA-durable and chemically resistant surfacing film supports increasing composite aircraft manufacturing rates for more sustainable air transport.
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Wang, Hui, Zheqin Liu, Suibin Luo, Rong Sun, Baojin Chu, and Shuhui Yu. "Preparation and properties of UV curable SiO2/Epoxy resin composite." In 2022 23rd International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2022. http://dx.doi.org/10.1109/icept56209.2022.9872589.

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Marnot, Alexandra, Jaehyun Cho, and Blair Brettmann. "Print Speed Optimization for UV-Assisted 3D Printing of Lunar Regolith Simulants Composite Inks." In ASME 2023 18th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/msec2023-102275.

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Abstract Direct-ink-write (DIW) 3D printing of dense composite inks is an attractive method of additive manufacturing for Lunar missions using in-situ derived resources. DIW offers a wide degree of freedom for formulation design with multiple methods for solidifying the inks post-extrusion. The use of UV-curing, however, poses certain complications when the loading of particles in the ink reaches levels above 50 vol% due to light scattering, absorption, and reflection. Herein, we investigate the curability of two Lunar regolith simulants, compared against a model system of glass microspheres, as particles in UV-curable inks. Photo-DSC is utilized to assess the degree of cure of the inks at a range of timescales. These results are tied to depth of cure experiments following the ISO 4049 method to verify cure depths meeting a target print layer height and to optimize the speed of printing while maintaining structural integrity. The extent of cure is verified both qualitatively through print shape fidelity and quantitatively through ATR-FTIR. This work not only highlights the importance of particle mineralogy for achievable UV-assisted solidification post-extrusion, but also presents test methods easily adapted to a design of experiment framework that require very little sample volume to identify successful formulations and printing parameters.
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