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Relevant bibliographies by topics / Polyurethane reaction

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Academic literature on the topic 'Polyurethane reaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Journal articles on the topic "Polyurethane reaction"

1

Schmidt and Eschig. "Hydrophobilization of Furan-Containing Polyurethanes via Diels–Alder Reaction with Fatty Maleimides." Polymers 11, no. 8 (July 31, 2019): 1274. http://dx.doi.org/10.3390/polym11081274.

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We describe new hydrophobic functionalized linear polyurethane resins by combining N-alkyl maleimides via the Diels–Alder reaction with linear furan-modified polyurethanes. This procedure provides the opportunity for the post-polymerization-functionalizing of polyurethanes. Access to furan-bearing polyurethanes is achieved via the reaction of a furan-containing diol, polyethylenglycol (PEG), and different diisocyanates. The furan-containing diol is obtained from the reaction of furfurylamine and two equivalents of hydroxyalkyl acrylate. The resulting furan-bearing polyurethanes are reacted with fatty amine-based N-alkyl maleimides. The maleimide and furan functionalities undergo a Diels–Alder reaction, which allows for the covalent bonding of the hydrophobic side chains to the polyurethane backbone. The covalent bonding of the hydrophobic maleimides to the polyurethane backbone is proven by means of NMR. The influence of the functionalization on the surface properties of the resulting polyurethane films is analyzed via the determination of surface energy via the sessile drop method.

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2

Bjelovic, Zoran, Ivan Ristic, Jaroslava Budinski-Simendic, Mirjana Jovicic, Jelena Pavlicevic, Branka Pilic, and Suzana Cakic. "The investigation reaction kinetic for polyurethanes based on different types of diisocyanate and castor oil." Chemical Industry 66, no. 6 (2012): 841–51. http://dx.doi.org/10.2298/hemind111216014b.

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The formation of polyurethanes based on vegetable oils is very complex and thus for industrial production of this materials it is important to determine the optimal temperature for polymerisation and finally to obtain materials with the proper mechanical properties. The goal of this work was to assess the kinetic of catalysed and noncatalysed reactions for polyurethanes based on castor oil as the polyol component and different types of diisocyanates. Due to the presences of hydroxyl groups on ricinoleic acid, castor oil is suitable for polyurethane preparation. The differential scanning calorimetry has been employed to study the polyurethane formation reaction using Ozawa isoconversion method. It was estimated that the catalyst addition decreases the activation energy. The highest reduction of activation energy was observed for the reactive systems with hexamethylene diisocyanate. Validity of obtained kinetic model was examined by FTIR spectroscopy following the apsorption of reactive groups. Obtained results of mechanical characteristics of the polyuretahane networks (with different NCO/OH ratio) confirmed that applied method could be used for prediction of optimal reaction condition in polyurethane networks synthesis.

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3

Correia, Cristina Borges, and João C. Bordado. "Synthesis and Characterization of New Polyurethane Adhesives." Materials Science Forum 514-516 (May 2006): 843–47. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.843.

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Polyurethane adhesives provide excellent flexibility, impact resistance and durability. Polyurethanes are formed through the reaction of an isocyanate component with polyether or polyester polyols or other active hydrogen compounds. This paper refers to polyurethane adhesives made from polyester polyols with long aliphatic chains (up to 36 carbon atoms) and MDI (diphenylmethane-4,4’-diisocyanate). The polyester polyols have been made from dimer acids obtained from renewable sources and short chain diols. The polyols that were used presented different degrees of unsaturation. The influence of the different raw materials in the adhesives performance is studied. The polyurethanes were produced by reaction between quasi-stoichiometric quantities of polyol and MDI, at several temperatures. The reaction was carried under inert atmosphere and at temperatures below 100°C. Performance of the adhesives was tested by carrying adhesion, hardness and water absorption tests. Characterization of both the polyester polyols and polyurethane adhesives was carried by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Magnetic Nuclear Resonance (NMR), X-Ray Diffraction (WAXD), Scanning RMN Imaging of 1H of Stray- Field b (MRI) and Brookfield viscometry.

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4

Briz-López, Eva Marina, Rodrigo Navarro, Héctor Martínez-Hernández, Lucía Téllez-Jurado, and Ángel Marcos-Fernández. "Design and Synthesis of Bio-Inspired Polyurethane Films with High Performance." Polymers 12, no. 11 (November 17, 2020): 2727. http://dx.doi.org/10.3390/polym12112727.

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In the present work, the synthesis of segmented polyurethanes functionalized with catechol moieties within the hard or the soft segment is presented. For this purpose, a synthetic route of a new catechol diol was designed. The direct insertion of this catechol-free derivative into the rigid phase led to segmented polyurethanes with low performance (σmax ≈ 4.5 MPa). Nevertheless, when the derivative was formally located within the soft segment, the mechanical properties of the corresponding functionalized polyurethane improved considerably (σmax ≈ 16.3 MPa), owing to a significant increase in the degree of polymerization. It is proposed that this difference in reactivity could probably be attributed to a hampering effect of this catecholic ring during the polyaddition reaction. To corroborate this hypothesis, a protection of the aromatic ring was carried out, blocking the hampering effect and avoiding secondary reactions. The polyurethane bearing the protected catechol showed the highest molecular weight and the highest stress at break described to date (σmax ≈ 66.1 MPa) for these kind of catechol-functionalized polyurethanes. Therefore, this new approach allows for the obtention of high-performance polyurethane films and can be applied in different sectors, benefiting from the molecular adhesion introduced by the catechol ring.

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5

Jiang, Lin, Filippo Berto, and Dan Zhang. "Pyrolysis Kinetics and Flammability Evaluation of Rigid Polyurethane with Different Isocyanate Content." Molecules 26, no. 8 (April 20, 2021): 2386. http://dx.doi.org/10.3390/molecules26082386.

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Polyurethane (PU) is a typical product of the reaction between isocyanate and polyol, whose ratio would greatly influence material properties. In this paper, to investigate the influence of isocyanate on PU thermal stability and flammability, three kinds of rigid polyurethanes (RPUs) with different isocyanate ratio (1.05, 1.1, and 2.0) were manufactured in a laboratory and employed to have a series of TG (thermogravimetry), DSC (differential scanning calorimetry), and cone calorimetry tests. Kissinger’s method was used to calculate the activation energy and judge their stabilities. However, for such a complex degradation which consists of five reactions, it does not make sense by Kissinger method to obtain only two peak active energies. Considering complexity of PU degradation in air, genetic algorithm (GA) was employed to calculate kinetic triplets of five sub-reactions. The effects of isocyanate contents on each sub-reaction stability were obtained and then analyzed. By cone calorimeter testing, we found that great differences in heat release rate data. However, DSC analysis showed a complete opposite changed trend. Such difference is caused by DSC and calorimeter’s sample morphology, the former using grinded polyurethane powders but the latter polyurethane foam block.

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6

Yang, Zhe, Yan Bin Zhu, Fang Peng, and Chang Qing Fu. "Preparation and Application of Undecylenate Based Diol for Bio-Based Waterborne Polyurethane Dispersion." Advanced Materials Research 955-959 (June 2014): 88–91. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.88.

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The undecylenate based diol (UAD) has been synthesized from undecylenate by esterification and thiol-ene click reaction sequently, and then it was used as a diol to prepare bio-based waterborne polyurethane (WPU) reacting with isophorone diisocyanate (IPDI) and castor oil-based carboxyl hydrophilic chain extender. The structure of undecylenate based diol was verified by hydrogen proton nuclear magnetic resonance (1H NMR). Fourier transform infrared spectroscopy (FT-IR) was used to characterize the structure of WPU film. Furthermore, particle size and viscosity were used to character apparent properties of the bio-based waterborne polyurethane dispersion. The result shows that: bio-based waterborne polyurethane dispersion is transparent and very stable under room temperature. This work provides a simple and efficient method for the preparation of fatty acids based polyols and bio-based waterborne polyurethanes.

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Oprea, Stefan. "Synthesis and Properties of Unsaturated Poly(Urethane-Imide)s." High Performance Polymers 15, no. 3 (September 2003): 291–99. http://dx.doi.org/10.1177/0954008303015003006.

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Unsaturated poly(urethane-imide)s were prepared by the reaction of unsaturated polyurethane prepolymers with maleic anhydride. The polyurethane prepolymers were synthesized by the reaction of 4,4′-methylene diphenyl diisocyanate (MDI) with unsaturated polyesters having a molecular weight of about 500 or with a mixture of unsaturated and saturated polyesters having a molecular weight of about 2000. The unsaturated polyurethane prepolymers reacted with maleic anhydride until the evolution of carbon dioxide ceased to yield unsaturated poly(urethane-imide)s. These polymers exhibited improved solubility in organic solvents and formed flexible films showing fairly good stress-strain properties. Compared to conventional polyurethanes based on MDI and poly(ethylene glycol adipate) these polymers exhibited better thermal stabilities due to the presence of the imide groups.

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Datta, J., and J. T. Haponiuk. "Influence of Glycols on the Glycolysis Process and the Structure and Properties of Polyurethane Elastomers." Journal of Elastomers & Plastics 43, no. 6 (September 2, 2011): 529–41. http://dx.doi.org/10.1177/0095244311413447.

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In this work, the influence of glycols on the glycolysis process and the properties of obtained polyurethanes were investigated. The glycolysates were produced via glycolysis of waste polyurethane foam in the reaction with one of the following glycols: 1,3-propanediol, 1,5-pentanediol, and 1,6-hexanediol.The reactions were carried out for different mass ratios of polyurethane wastes to glycolysis agent, i.e. 6:1, 8:1, and 10:1. Polyurethanes were synthesized from the obtained intermediates by a one-step method of mixing polymeric di-isocyanate and the glycolysis products with molecular masses ranging from 700 to 1000, while a polyol (Poles 55/20) was used as a chain elongation agent. The influence of glycolysates on tensile strength and elongation at break of polyurethanes was investigated using a Zwick universal tensile tester. Thermal decomposition of the obtained glycolysates and polyurethanes was investigated by thermogravimetry coupled with Fourier transform infrared spectroscopy. It has been found that of all used glycols, 1,6-hexanediol gives the best improvement in the thermal stability of polyurethanes during the glycolysis process. The mean hardness of polyurethanes decreases but rebound resilience increases with chain length of the glycol used for obtaining glycolysates.

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Chen, Lijun, and Wei Jiang. "Modification of polyurethane with novel blocking agent." Pigment & Resin Technology 43, no. 2 (February 25, 2014): 97–103. http://dx.doi.org/10.1108/prt-04-2013-0030.

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Purpose – Fluorinated polyurethane combines some virtues of polyurethane and fluorinated polymer, such as low water absorption, attractive surface properties, good wearability and high weatherability. Fluorocarbon chains have been incorporated into polyurethanes by fluorinated diisocyanates, chain extenders, polyether glycols, polyester glycols and end-cappers. However, the fluorinated polyurethane, which is prepared with monohydric fluorocarbon alcohol, is seldom reported. The purpose of this research is to prepare and apply the novel fluorocarbon alcohols with side chain to modify polyurethane as the blocking agent. Design/methodology/approach – The novel fluorocarbon alcohol with side chain 2-methoxy-3-nonene perfluorinated oxygen propanol (MNPOP) can be prepared via alcoholysis reaction of methanol and 2,3-epoxypropyl perfluorinated nonene ether (EPPNE), which was prepared with etherification of hexafluoropropene trimer (HFPT) and 2,3-glycidol. Structures of EPPNE and MNPOP are confirmed with FTIR and NMR. The polyurethane can be modified when MNPOP is used as blocking agent. Findings – In comparison with the conventional polyurethane, the hydrophobic property of fluorinated polyurethane is improved. However, the increase of tensile strength of modified polyurethane is not obvious because MNPOP belongs to monohydric alcohol. And the function of MNPOP in the modified polyurethane is the blocking agent. The thermal stability of conventional and modified polyurethane is almost the same because MNPOP is de-blocked and fluorocarbon chains have not been incorporated into polyurethanes when the temperature is more than 150°C. Originality/value – The polyurethane is modified with the novel fluorocarbon alcohols with side chain, which functions as the blocking agent. The hydrophobic property of fluorinated polyurethane is improved.

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10

Lee, Jong Baek, Kwang Hyun Lee, Byung Chul Kang, Byung Won Kang, Sang Ll Lee, and Jin Kyung Lee. "Thermal Properties of a Liquid-Crystalline Polyurethanes Containing Biphenyl Mesogen." Key Engineering Materials 321-323 (October 2006): 1385–88. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1385.

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A new type of thermotropic main-chain liquid crystalline polyurethanes containing biphenyl units was synthesized by polyaddition reaction of diisocyanates such as 2,6-tolylene diisocyanate, 2,5-tolylene diisocyanate, 2,4-tolylene diisocyanate, and 1,4-phenylene diisocyanate, with 4,4′-Bis(11-hydroxyundeyloxy)biphenyl (BP11). The structure of the monomer and the corresponding polymers were confirmed FT-IR and 1H NMR spectroscopic methods. BP11 exhibited a smectic type mesophase, however, nematic phase was found for all synthesized liquid crystalline polyurethanes except for 1,4-phenylene diisocyanate/BP11 based polyurethane. For example, polyurethane 2,5-TDI/BP11 exhibited monotropic liquid crystallinity in the temperature ranges from 173 to 156 °C on the cooling stage.

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Dissertations / Theses on the topic "Polyurethane reaction"

1

Ota, Toshimasa 1956. "Microcellular polyurethane foaming by modified reaction injection molding." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11495.

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2

Alminderej, Fahad Mohammad. "SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE DENDRIMERS SUBSEQUENT CLICK REACTION." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1469447068.

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3

Gerry, Neil Leslie. "Mathematical modelling of the reaction and flow of polyurethane foams." Thesis, University of Exeter, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293996.

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4

Lu, Shiying. "Processing of highly filled polyurethane elastomers by reaction injection moulding." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/28224.

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This study is to investigate the fabrication of filled polyurethane elastomer tiles by the reaction injection moulding (RIM) process. The base matrix is composed of a crosslinked polyurethane elastomer formed by the reaction between a diisocyanate (MDI) and a polyol (polytetramethylene glycol) and crosslinked by trimethylol propane (TMP). The two fillers investigated were barium sulphate and Expancel which were used to dissipate and scatter sonic waves in acoustic damping applications.

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5

Poudel, Dhruba P. "Late-Stage Modification of Polyurethane Dendrimers Using Click Chemistry." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1627490978861964.

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6

Zhang, Xiang. "One-pot catalytic reaction of crude glycerin for biopolyols and polyurethane foam production." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306458447.

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7

Callison, June. "The investigation of a side reaction leading to colour formation in a polyurethane production chain." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2498/.

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In the industrial synthesis of 4,4’-methylene diphenyl diisocyanate (MDI), an unwanted side reaction between the product and the starting material, 4,4’-methylene dianiline, can lead to the formation of ureas. It has been postulated these ureas undergo further reaction with phosgene to produce a precursor to chlorine radicals, which could then attack the MDI backbone forming conjugated systems that would promote colour in the final products. To investigate this process model compounds including 4-benzylaniline (4-BA) and 1,3-diphenylurea were used as starting materials. The reactions carried out showed the phosgenation of the urea forms a chloroformamidine-N-carbonyl chloride (CCC) which upon heating > 303 K can break down to form an isocyanide dichloride (ID). Conventional synthesis routes were used to gain high yields of p-tolyl and phenyl isocyanide dichlorides in order to analyse the compounds. It was found that upon heating to 453 K or irradiating the isocyanide dichlorides in the process solvent (chlorobenzene) coloured solutions were formed; with the presence of MDI and oxygen increasing the intensity of the colouration. Electron paramagnetic resonance spectroscopy was used to gain information on the use of isocyanide dichlorides as a source of chlorine radicals. Using N-tert-butyl--phenylnitrone (PBN) as a spin trap, an 8 line spectra relating to the chlorine adduct was measured confirming the production of Cl•. Throughout the project side reactions involving the formation of carbodiimide from CCC and a secondary route for the phosgenation of the urea to the isocyanate have been investigated and are presented within a global reaction scheme. It was also found the ureas were only partially soluble in the process solvent leading to research into the structure of three different urea molecules and the proposal of a modified reaction scheme.

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8

Brunson, Kennard. "POLYURETHANE-BASED POLYMER SURFACE MODIFIERS WITH ALKYL AMMONIUM CO-POLYOXETANE SOFT BLOCKS: REACTION ENGINEERING, SURFACE MORPHOLOGY AND ANTIMICROBIAL BEHAVIOR." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2258.

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Concentrating quaternary (positive) charge at polymer surfaces is important for applications including layer-by-layer polyelectrolyte deposition and antimicrobial coatings. Prior techniques to introduce quaternary charge to the surface involve grafting of quaternary ammonium moieties to a substrate or using polyurethanes with modified hard segments however there are impracticalities involved with these techniques. In the case of the materials discussed, the quaternary charge is introduced via polyurethane based polymer surface modifiers (PSMs) with quaternized soft segments. The particular advantage to this method is that it utilizes the intrinsic phase separation between the hard and soft segments of polyurethanes. This phase separation results in the surface concentration of the soft segments. Another advantage is that unlike grafting, where modification has to take place after device fabrication, these PSMs can be incorporated with the matrix material during device fabrication. The soft segments of these quaternized polyurethanes are produced via ring opening copolymerization of oxetane monomers which possess either a trifluoroethoxy (3FOx) side chains or a quaternary ammonium side chain (C12). These soft segments are subsequently reacted with 4,4’-(methylene bis (p-cyclohexyl isocyanate)), HMDI and butanediol (BD) to form the PSM. It was initially intended to increase the concentration of quaternary ammonium charge by increasing PSM soft segment molecular weight. Unexpectedly, produced blends with surface microscale phase separation. This observation prompted further investigation of the effect of PSM soft segment molecular weight on phase separation in PSM-base polyurethane blends and the subsequent effects of this phase separation on the biocidal activity. Analysis of the surface morphology via tapping mode atomic force microscopy (TMAFM) and scanning electron microscopy (SEM) revealed varying complexities in surface morphology as a function of the PSM soft segment molecular weight and initial annealing temperature. Many of these features include what are described as nanodots (100-300 nm), micropits (0.5-2 um) and micropeaks (1-10 um). It was also observed that surface morphology continued to coarsen with time and that the larger features were typically observed in blends containing PSMs with low molecular weight soft segments. This appearance of surface morphological feature correlates with decreased biocidal activity of the PSM blends, that is, the PSM blends exhibit little to no activity upon development of phase separated features. A model has been developed for phase separation and concomitant reduction of surface quaternary charge. This model points the way to future work that will stabilize surface charge and provide durability of surface modification.

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Tremblay-Parrado, Khantutta-Kim. "Synthesis by click chemistry of biobased polyurethane networks with advanced properties." Thesis, Strasbourg, 2020. https://publication-theses.unistra.fr/restreint/theses_doctorat/2020/TREMBLAY-PARRADO_Khantutta-Kim_2020_ED182.pdf.

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Notre époque a connu une révolution avec l'émergence des matières plastiques qui ont désormais une importance inégalée dans notre vie quotidienne. Cependant, ce fort développement entraine de trop nombreux déchets dans l’environnement avec de forts impacts environnementaux et ceci de façon croissante. Pour répondre à cela, l’élaboration de polymères durables avec l'utilisation de ressources renouvelables et des propriétés avancées pour gérer la fin de vie des matériaux est attendue. Le développement de réseaux covalents adaptables (RCA) est apparu comme une alternative intéressante pour répondre à ces attentes en développant des applications dans le domaine des polyuréthanes (PUs) biosourcées. Dans ces travaux, nous utilisons la réaction de Diels-Alder thermoréversible avec un couplage furanne-maléimide pour la synthèse de PUs dérivés d'huiles végétales et des points de réticulation thermoréversibles. Deux nouveaux synthons dérivés de l'huile de tournesol, portant des groupes furane et maléimide, ont été obtenus et incorporés dans des réseaux PU biosourcées. Les réseaux obtenus donnent des résultats prometteurs en termes de propriétés, de recyclabilité thermique et d'autoréparation thermo-induite. Les réseaux PU synthétisés et analysés constituent un tremplin dans le développement de RCA biosourcées à plus faible impact environnemental
The modern era was revolutionized by the invention of plastics and as such have gained prevalence in most aspects of our daily lives, causing an increasing appearance in landfills and oceans. For this reason, sustainable polymer design should not only require the use of renewable resources, but also factor in advanced properties to manage the end-of-life materials for the reduction of energy use, resources and waste. Developing covalent adaptable networks (CANs) has emerged as an interesting alternative to address this problematic, but with little to no application in the domain of biobased polyurethanes. In this work, we utilize the thermoreversible Diels-Alder reaction of the furan-maleimide coupling for the synthesis of vegetable oil derived polyurethanes (PUs) with thermo-reversible cross-linking points. Two new building blocks derived from sunflower oil, bearing furan and maleimide moieties, were obtained and incorporated into the synthesis of biobased PU networks. The obtained PU networks yield promising results in terms of polymer properties, thermal recyclability and heat-induced self-healing. The synthesized PU networks provide a stepping-stone in the development of biobased CANs

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10

Verhoeven, Vincent Wilhelmus Andreas. "The reactive extrusion of thermoplastic polyurethane." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2006. http://irs.ub.rug.nl/ppn/292374224.

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Books on the topic "Polyurethane reaction"

1

Linham, Mike. Reaction moulded polyurethane: Module 32. Rossendale: Footwear OPEN TECH Unit, 1986.

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Lu, Shiying. Processing of highly filled polyurethane elastomers by reaction injection molding. 1999.

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3

Polyurethanes: RIM: reaction injection molding : RRIM: reinforced reaction injection molding. Hergiswil: A.A. De Schrijver, 1985.

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4

(Editor), Henri Ulrich, ed. Reaction Polymers: Polyurethanes, Epoxies, Unsaturated Polyesters, Phenolics, Special Monomers and Additives : Chemistry, Technology, Applications,. Hanser Gardner Publications, 1992.

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5

F, Gum Wilson, Riese Wolfram, and Ulrich Henri 1925-, eds. Reaction polymers: Polyurethanes, epoxies, unsaturated polyesters, phenolics, special monomers, and additives : chemistry, technology, applications, markets. Munich: Hanser Publishers, 1992.

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Ulrich, Henri, etc. (Ed.), ed. Reaction Polymers: Polyurethanes, Epoxies, Unsaturated Polyesters, Phenolics, Special Monomers and Additives - Chemistry, Properties, Applications, Markets. C.Hanser,Germany, 1991.

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Gum. Reaction Polymers: Polyurethanes, Epoxies, Unsaturated Polyesters, Phenolics, Special Monomers, and Additives Chemistry, Technology, Applications, Markets (Hanser Publishers). Oxford University Press, USA, 1992.

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Book chapters on the topic "Polyurethane reaction"

1

Hepburn, C. "Reaction Rates, Catalysis and Surfactants." In Polyurethane Elastomers, 107–21. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2924-4_4.

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Hepburn, C. "Reaction Injection Moulding (Liquid Injection Moulding)." In Polyurethane Elastomers, 174–98. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2924-4_6.

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3

Huang, Yunlong, Zhigang Hu, Ying Chen, Xiaoyu Li, and Haiqiao Wang. "Effect of Ketone and Hydrazine Self-Crosslinking Reaction on Polyurethane Emulsion." In Lecture Notes in Electrical Engineering, 917–24. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3530-2_113.

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Budinski-Simendić, J., M. Ilavsky, Jan Šomvarsky, M. Špírková, Lj Korugić-Karasz, R. Radičević, T. Dikić, and K. Dušek. "Rubber Elasticity Study of Polyurethane Networks Prepared by Cyclotrimerisation Crosslinking Reaction of Isocyanate Groups." In Materials Science Forum, 491–96. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-441-3.491.

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Gunes, I. Sedat, Changdo Jung, and Sadhan C. Jana. "Evolution of Nonlinear Rheology and Network Formation during Thermoplastic Polyurethane Polymerization and Its Relationship to Reaction Kinetics, Phase Separation, and Mixing." In Nonlinear Dynamics with Polymers, 21–44. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527632602.ch3.

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Farrissey, William J., Roy E. Morgan, Rick L. Tabor, and Melissa Zawisza. "Recycling of Reaction Injection Molded Polyurethanes." In ACS Symposium Series, 272–95. Washington, DC: American Chemical Society, 1992. http://dx.doi.org/10.1021/bk-1992-0513.ch022.

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Akbari, Morteza, and Reza Najjar. "Reactive and Functional Polyesters and Polyurethanes." In Reactive and Functional Polymers Volume One, 157–94. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43403-8_8.

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Malavašič, Tatjana, Irena Anžur, and Uči Osredkar. "Study of the Polyurethane Reactions by Differential Scanning Calorimetry." In Integration of Fundamental Polymer Science and Technology—4, 75–79. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0767-6_11.

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Li, Hongwei, Zhongshun Yuan, Yongsheng Zhang, Chun Chang, and Chunbao (Charles) Xu. "Synthesis of Biobased Polyurethane Foams From Agricultural and Forestry Wastes." In Reactive and Functional Polymers Volume One, 137–56. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43403-8_7.

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Navarro-Baena, Ivan, Marina P. Arrieta, Alicia Mujica-Garcia, Valentina Sessini, Daniel Lopez, José M. Kenny, and Laura Peponi. "Thermal Degradation Effects on Polyurethanes and Their Nanocomposites." In Reactions and Mechanisms in Thermal Analysis of Advanced Materials, 165–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119117711.ch7.

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Conference papers on the topic "Polyurethane reaction"

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Livorness, John. "Polyurethane Reaction Injection Moulded (R.I.M.) Modular Windows." In 4th International Pacific Conference on Automotive Engineering. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1987. http://dx.doi.org/10.4271/871297.

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Berg, James W. "Lightweight Reaction Injection Molded Polyurethane for Automotive Fascia." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/950552.

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Magerstädt, Michael, Holger Schmidt, Gunther Blitz, Ralf Dopieralla, and Frank Schellbach. "Novel High Performance Elastomers: New, Recyclable Materials for Oil and Gas From In-Line Inspection to Pipe Coating." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90185.

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Starting out from the need for polyurethanes with higher abrasion and tear resistance for pipeline inspection, an entire class of new high performance elastomers were developed. Within a few years materials were synthesized which did not only extend the mechanical properties of polyurethane elastomers, but also led to the development of completely new products. Applications range from intelligent plastic solutions combining elastomers and electronics via highly abrasion resistant pipe coatings to a new process for recycling and reuse of crosslinked polyurethanes. Fundamental to these successful developments is the “building-block” chemistry of polyurethanes. A very high number of permutations of the up to 7 components used in the synthesis of a polyurethane elastomer is possible. By choosing the right combinations and the right reaction conditions, specific material properties can be designed. Materials exhibiting the following material properties, hitherto not found in polyurethanes, were developed: • An operating temperature range from −50 to +135°C. • Chemical resistance to highly acidic and alkaline media, e.g., pure ammonia. • Significantly higher abrasion and tear resistance than standard polyurethanes. • Exactly adjustable visco-elastic damping (rebound resilience). • Adhesion to steel higher than reported with any other polyurethane elastomer. • A novel polyurethane elastomer with more than 90% share of recycled material reaching mechanical properties in the same range as virgin material. This presentation will detail the materials and their properties and give application examples from pipeline cleaning, pipe protection, and pipe coating to mechanical protection devices made from recycled polyurethane elastomer.

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Li, Jie, Shiu-Wing Tam, and Yung Y. Liu. "Burn Behavior of a Polyurethane Foam Impact Limiter." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77261.

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We recently studied the burn behavior of a polyurethane (PU) foam-filled impact limiter — a design for both the Mixed-Oxide Fresh Fuel Package and the Hanford Unirradiated Fuel Package (HUFP) that have been certified for shipment of their authorized contents by the U.S. Nuclear Regulatory Commission and the U.S. Department of Energy, respectively. In this paper, we examined the mechanisms of thermal degradation of PU foam by reaction type and flame temperature. Evidence suggests that, for an air-tight impact limiter, the pyrolysis reaction dominates initially in the limiter enclosure. The pyrolysis generates a large amount of highly flammable gases, creating the conditions necessary for a subsequent combustion reaction near the vent holes where air is abundant. The coupled heat release from the combustion of these flammable gases and oxygen drives the jet flames to burn at a very high temperature. The three-dimensional finite-element analysis code, ANSYS Mechanical, was used to model the HUFP package (with the PU foam-filled impact limiters) and compute the temperatures near the seal region of the containment boundary of the package. We examined the effects of various parameters — including fire duration, chimney flow, foam thickness loss, and jet flame temperature — on the thermal performance of the package. The results indicate that, under the simulated conditions, the O-ring seal temperature near the packaging containment boundary rose to varying degrees, but it did not exceed the seal temperature limit of 400°F (204°C). The remaining foam thickness is critical to maintain package safety.

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Mohan, Sriram, Anandh Balakrishnan, and Mrinal C. Saha. "Cure Kinetics of Neat and Nanophased Polyurethane Foams." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68063.

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In this work, the isothermal cure behavior of a two part polyurethane foam system has been evaluated at temperatures between 25°C–80°C via a rheokinetic method. An ATD CSS 1000-Advanced Polymer Analyzer (APA) rheometer operating in torsion mode was used for this purpose. In the first phase of our work, neat polyurethane foams were investigated and the effects of cure temperature on the final cure modulus and density were documented. The testing procedure consisted of measuring G* as a function of time. The data obtained was fit to a generalized cure kinetics model to evaluate various parameters such as rate constants, reaction orders and activation energies. The rate constants as a function of temperature exhibited a straight line Arrhenius relationship. In the second phase of the work, 1% by weight of cloisite-15A nanoclay was used to manufacture nanocomposite foams. Isothermal cure tests were performed on the nanocomposite foam sample at 25°C. A preliminary investigation of the effect of nanoclay infusion on the final cure properties revealed no significant change. However the nanoclay foam sample exhibited higher reaction rates than its neat counterpart at the same temperature. The cell structures of these foams were studied using a JEOL 960 Scanning Electron Microscope. The micrographs supported the observations that neat foam samples showed an increased density and modulus at lower temperatures than at higher temperatures. The nanoclay sample also showed a higher density relative to its neat counterpart.

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Triwulandari, Evi, Mohammad Kemilau Ramadhan, and Muhammad Ghozali. "Influence of reaction condition on viscosity of polyurethane modified epoxy based on glycerol monooleate." In INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY (ISAC) 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4973180.

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Chudinov, Vyacheslav, Igor Shardakov, Valery Litvinov, Yaroslav Ivanov, Sergey Solodnikov, and Alexey Kondyurin. "To Avoid A Foreign Body Reaction For Polyurethane Implants Modified By High-Energy Ions." In 2021 IEEE Ural-Siberian Conference on Computational Technologies in Cognitive Science, Genomics and Biomedicine (CSGB). IEEE, 2021. http://dx.doi.org/10.1109/csgb53040.2021.9496028.

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Triwulandari, Evi, Mohammad Kemilau Ramadhan, and Muhammad Ghozali. "Effect of reaction time and polyethylene glycol monooleate-isocyanate composition on the properties of polyurethane-polysiloxane modified epoxy." In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2017. Author(s), 2017. http://dx.doi.org/10.1063/1.5011903.

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Bloß, P., A. Böhme, J. Müller, P. Krajewsky, and J. Michaelis. "Adhesion strength between thermoplastics and its polyurethane coating made by using the technology combination of injection molding and reaction injection molding." In PROCEEDINGS OF PPS-29: The 29th International Conference of the Polymer Processing Society - Conference Papers. American Institute of Physics, 2014. http://dx.doi.org/10.1063/1.4873868.

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ASAHI, N., K. SAKAI, N. KUMAGAI, T. NAKANISHI, K. HATA, S. KATOH, and T. MORIYOSHI. "DECOMPOSITION STUDY OF COMMERCIALLY AVAILABLE POLYURETHANE FOAM BY SUB- AND SUPERCRITICAL METHANOL." In Proceedings of the Seventh International Symposium on Hydrothermal Reactions. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705228_0023.

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