Academic literature on the topic 'Urethanes'

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Journal articles on the topic "Urethanes"

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Trankina, E. S., A. Yu Kazantseva, D. A. Khanin, et al. "Non-Isocyanate Poly(Siloxane-Urethanes) Based on Oligodimethylsiloxanes Containing Aminopropyl and Ethoxy Substituents." Высокомолекулярные соединения С 65, no. 2 (2023): 164–73. http://dx.doi.org/10.31857/s2308114723700437.

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Environmentally friendly method for the synthesis of crosslinked poly(siloxane-urethanes) avoiding the use of toxic isocyanates has been presented. The synthesis has been performed in two stages: at the first stage, non-isocyanate poly(siloxane-urethanes) have been synthesized via aminolysis of cyclocarbonates (differing in the structure and functionality) with oligomer dimethylsiloxanes bearing aminopropyl and ethoxy substituents, and crosslinked non-isocyanate poly(siloxane-urethanes) have been obtained via hydrolysis of the ethoxy groups with air moisture. According to the TGA data, process
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Tennebroek, R., J. Geurts, A. Overbeek, and A. Harmsen. "Self crosslinkable urethanes and urethane-acrylics." Surface Coatings International 83, no. 1 (2000): 13–19. http://dx.doi.org/10.1007/bf02692682.

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Jalali, Shakeeba. "APPLICATION OF DYNAMIC MECHANICAL ANALYSIS FOR UV-CURED COATINGS." Chemistry & Material Sciences Research Journal 2, no. 2 (2020): 55–59. http://dx.doi.org/10.51594/cmsrj.v2i2.138.

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The present study is about soya epoxy ester which was made by epoxy resin and fatty acid. Oleochemical polyols were prepared after the soya epoxy ester reacted with various hydroxyl and cellulose based derivatives. These oleochemical polyols were changed to urethanes prepolymers by reacting NCO groups of TDI and IPDI. By utilizing the reaction of NCO end group of urethane with HEMA, these urethanes were transformed in to urethane acrylate oligomer. By mixing the oligomers with various reactive diluents, UV curable coating compositions were derived. The methodology was based on dynamic mechanic
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Endo, Takeshi, and Atsushi Sudo. "Well-Defined Construction of Functional Macromolecular Architectures Based on Polymerization of Amino Acid Urethanes." Biomedicines 8, no. 9 (2020): 317. http://dx.doi.org/10.3390/biomedicines8090317.

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Polypeptide synthesis was accomplished using the urethane derivatives of amino acids as monomers, which can be easily prepared, purified, and stored at ambient temperature without the requirement for special precautions. The urethanes of amino acids are readily synthesized by the N-carbamoylation of onium salts of amino acids using diphenyl carbonate (DPC). The prepared urethanes are then efficiently cyclized to produce amino acid N-carboxyanhydrides (NCAs). Thereafter, in the presence of primary amines, the ring-opening polymerization (ROP) of NCAs is initiated using the amines, to yield poly
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More, Ganesh Sunil, and Rajendra Srivastava. "Synthesis of amino alcohols, cyclic urea, urethanes, and cyclic carbonates and tandem one-pot conversion of an epoxide to urethanes using a Zn–Zr bimetallic oxide catalyst." Sustainable Energy & Fuels 5, no. 5 (2021): 1498–510. http://dx.doi.org/10.1039/d0se01912g.

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The one-pot tandem synthesis of urethanes directly from an epoxide, with urea in solvent-free condition using Zn<sub>2</sub>ZrOx is demonstrated. The catalyst exhibits excellent activity in cyclic urea, urethane, and cyclic carbonate production in neat conditions.
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Tanzi, Maria Cristina, Diego Mantovani, Paola Petrini, Robert Guidoin, and Ga�tan Laroche. "Chemical stability of polyether urethanes versus polycarbonate urethanes." Journal of Biomedical Materials Research 36, no. 4 (1997): 550–59. http://dx.doi.org/10.1002/(sici)1097-4636(19970915)36:4<550::aid-jbm14>3.0.co;2-e.

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Wang, Hai Yan, Yu Wen Liu, Ji Feng Tian, Bin Sun, and Shi Jie Huang. "FT-IR Analysis of Molecular Structure Evolvement of Poly(Ether urethanes) in Ozone Atmosphere." Advanced Materials Research 742 (August 2013): 215–19. http://dx.doi.org/10.4028/www.scientific.net/amr.742.215.

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The failure behavior of Poly (ether urethanes) in ozone atmosphere was investigated by FTIR, UV-Vis spectra and SEM analysis. It is found that some oxygen-containing groups such as the hydroxyl group and the carbonyl group increase first and then slightly decrease with the ozone oxidation time and the carbohydryl and ether bonds decrease slowly. After oxidation by ozone, the polyurethane molecule chains break on C-O in ether and urethane groups instead of chain crosslinking. In addition, ozone oxidization increases the color difference and lowers the UV light transparence of polyurethane.
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Hicks, D. A., M. Krommenhoek, D. J. Soderberg, and J. F. G. Hopper. "Polyurethanes Recycling and Waste Management." Cellular Polymers 13, no. 4 (1994): 259–76. http://dx.doi.org/10.1177/026248939401300401.

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Almost everybody in the urethanes industry is by now familiar with the different options for the recycling of urethane-based materials. Physical recycling (fillers in the polyol), chemical recycling (glycolysis, hydrolysis) and energy recovery are the main options under development. The actual process, however, is only a part of the equation. Disassembly, logistics, applications for recycled materials and market size are other vital elements for success. In this paper, progress is presented on the different recycling options, in conjunction with a cost model which has been developed especially
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Sysoev, Vladislav A., Renat R. Nazmutdinov, Alfiya R. Garifullina, Tamara T. Zinkicheva, and Marina N. Kalukova. "THERMODYNAMIC ASPECTS OF AMINOLYSIS PROCESSES OF UNSYMMETRIC ALKYLENE CARBONATES." Technologies & Quality 66, no. 4 (2024): 42–46. https://doi.org/10.34216/2587-6147-2024-4-66-42-46.

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The article analyzes the peculiarity of the reaction of urethane formation of alkylene carbonate – amine. Using quantum chemical calculations using the B3LYP hybrid functional embedded in the Gaussian-16 software package, the authors evaluated the thermodynamic feasibility of the presented reactions. The results obtained under the specified standard conditions showed that the interaction of asymmetric alkylene carbonates with amines leads to the formation of a mixture of isomeric urethane alcohols containing primary and secondary hydroxyls. Moreover, the ratio of isomers and the thermodynamic
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Kalukova, Marina N., Vladislav A. Sysoev, and Alfiya R. Garifullina. "THE EFFECT OF HYDROXYL-CONTAINING LOW-MOLECULAR URETHANES ON HYGIENIC CHARACTERISTICS OF CLOTHING LEATHER." Technologies & Quality 59, no. 1 (2023): 16–19. http://dx.doi.org/10.34216/2587-6147-2023-1-59-16-19.

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In this paper, the main hygienic properties of clothing leather made from sheepskin treated with solutions of hydroxyl-containing non-isocyanate urethanes are investigated in order to reduce the use of chromium compounds. The article presents the values of vapour permeability, wetness, hygroscopicity, mois- ture loss, porosimetry data. It has been established that as a result of processing a semi-finished product of clothing leather from sheepskin with synthesised urethanes, the welding temperature increased by 5…9 °C. Indicators of hygroscopicity and moisture loss do not differ significantly
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Dissertations / Theses on the topic "Urethanes"

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Xiong, Cher. "A study of two-component clear casting urethanes, urethane catalysts, and related processes." Online version, 1998. http://www.uwstout.edu/lib/thesis/1998/1998xiongc.pdf.

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Pierce, Benjamin Franklin Ashby Valerie. "Thermally-responsive polyester urethanes." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1982.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.
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Cane-Honeysett, Daniel John. "1,2,4-dithiazolidine-3,5-diones in solid-phase chemistry : (a new approach to isocyanates)." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251161.

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Clayton, Anthony Brian. "Photopolymerised urethane acrylates /." Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phc622.pdf.

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Tang, Yi-wen. "Effect of microdomain structures on the enzyme induced hydrolytic degradation of polycarbonate-urethanes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/NQ53716.pdf.

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Phiasivongsa, Pasit. "Synthesis of saccharomimetic fucopyranosyl -substituted urethanes and ureas from glycopyranosyl nitromethanes and cyanides." Scholarly Commons, 2002. https://scholarlycommons.pacific.edu/uop_etds/2699.

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Part I . Mechanistic intermediates were discovered in the Henry condensations of partially and non-protected pyranoses with a free anomeric hemiacetal function with nitromethane in various solvents for the syntheses of C-glycopyranosides in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/molecular sieves catalyst system. Part II . Syntheses of glycosyl cyanides were optimized with a new catalyst system. Mechanism of cyanation with trimethylsilyl cyanide (TMS-CN) in the presence of the mild and recyclable Lewis acid HgBr 2 in nitromethane were proposed for the syntheses of 1,2-trans pe
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Soto, Hernández Marc. "Proton-coupled electron transfer activation of acidic weak nucleophiles. Highly fluorinated urethanes and polyurethanes from polyfluorinated alcohols." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/284389.

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Els materials polifluorats mostren unes propietats molt interessants com per exemple alta estabilitat tèrmica i química. Per altra banda, els poliuretans (policarbamats) són uns dels materials més versàtils i utilitzats avui en dia. Per això, aquesta tesi s’ha centrat en la reacció d’isocianats aromàtics amb alcohols polifluorats amb l’objectiu principal de desenvolupar una metodologia per preparar carbamats i poliuretans fluorats. No obstant, el major obstacle per aquesta reacció és la baixa nucleofília dels alcohols polifluorats, que no reaccionen amb isocianats en condicions estàndard. Uti
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Tatu, Rigwed R. "Effects of Aqueous Chlorhexidine Gluconate Exposure on Thermal, Mechanical and Chromatographic Properties of Polycarbonate and Polyether Urethanes." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1407408200.

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Kaiser, Ricky L. "Synthesis and Characterization of ABA Block Polyurethanes and Block Poly(Ether Urethanes) Containing Pendant-Functionalized DIol Monomers." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1418317693.

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Nelsen, Tyler. "Performance of concrete bridge deck surface treatments /." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd810.pdf.

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Books on the topic "Urethanes"

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G, Salmon Andrew, and Zeise Lauren, eds. Risks of carcinogenesis from urethane exposure. CRC Press, 1991.

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Woods, George. The ICI Polyurethanes book. 2nd ed. Published jointly by ICI Polyurethanes and Wiley, 1990.

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Company, Technomic Publishing, ed. Advances in urethanes: Elastomers, coating, adhesives, sealants. Technomic Pub. Co., 1985.

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Yuan, Yao, and Turner-Fairbank Highway Research Center, eds. Laboratory and test-site testing of moisture-cured urethanes on steel in salt-rich environment. U.S. Dept. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2000.

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Yuan, Yao, and Turner-Fairbank Highway Research Center, eds. Laboratory and test-site testing of moisture-cured urethanes on steel in salt-rich environment. U.S. Dept. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2000.

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Chong, Shuang-Ling. Laboratory and test-site testing of moisture-cured urethanes on steel in salt-rich environment. U.S. Department of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2000.

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Yuan, Yao, and Turner-Fairbank Highway Research Center, eds. Laboratory and test-site testing of moisture-cured urethanes on steel in salt-rich environment. U.S. Dept. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2000.

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F, Jacobson Michael, ред. Tainted booze: The consumerʼs guide to urethane in alcoholic beverages. Center for Science in the Public Interest, 1987.

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Timko, Robert J. Laboratory evaluation of spray-applied rigid urethane foams. U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Naylor, Steven. Microphase separation in segmented poly(ether-urethane)s. UMIST, 1995.

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Book chapters on the topic "Urethanes"

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Gooch, Jan W. "Rigid Thermoplastic Urethanes." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10059.

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GIRGIS, MIKHAIL M. "Fiberglass Reinforcements in RIM Urethanes." In ACS Symposium Series. American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0270.ch015.

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Barrera-Rivera, Karla A., Ángel Marcos-Fernández, and Antonio Martínez-Richa. "Chemo-Enzymatic Syntheses of Polyester-Urethanes." In ACS Symposium Series. American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1043.ch016.

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Thoma, R. J., T. Q. Hung, E. Nyilas, A. D. Haubold, and R. E. Phillips. "Metal Ion Complexation of Poly(Ether)Urethanes." In Advances in Biomedical Polymers. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1829-3_15.

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Elliott, Peter T., Linlin Xing, Wylie H. Wetzel, and J. Edward Glass. "Behavior of Branched-Terminal, Hydrophobe-Modified, Ethoxylated Urethanes." In ACS Symposium Series. American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0765.ch010.

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Shi, F. Y., L. F. Wang, E. Tashev, and K. W. Leong. "Synthesis and Characterization of Hydrolytically Labile Poly(phosphoester—urethanes)." In ACS Symposium Series. American Chemical Society, 1991. http://dx.doi.org/10.1021/bk-1991-0469.ch014.

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Riley, Dennis, William D. McGhee, and Thomas Waldman. "Generation of Urethanes and Isocyanates from Amines and Carbon Dioxide." In Benign by Design. American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0577.ch010.

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Bamford, C. H., I. P. Middleton, Y. Satake, and K. G. Al-Lamee. "Grafting and Attachment of Antiplatelet Agents to Poly(Ether-Urethanes)." In Advances in Polymer Synthesis. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2121-7_15.

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Ma, Zeying, and J. Edward Glass. "Complexations of Beta-Cyclodextrin with Surfactants and Hydrophobically Modified Ethoxylated Urethanes." In ACS Symposium Series. American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0765.ch015.

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Barrera-Rivera, Karla A., Ángel Marcos-Fernández, and Antonio Martínez Richa. "Chemoenzymatic Synthesis and Characterization of Polyester-Urethanes Bearing Amino-Acids Moieties." In ACS Symposium Series. American Chemical Society, 2015. http://dx.doi.org/10.1021/bk-2015-1192.ch003.

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Conference papers on the topic "Urethanes"

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Capino, Liza. "Fluoro-Urethanes Coatings with Extreme Exterior Durability." In Paint and Coatings Expo (PACE) 2007. SSPC, 2007. https://doi.org/10.5006/s2007-00017.

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Abstract Performance properties of solvent-based urethane topcoats formulated with fluorinated polymers are reviewed. Fluoro-urethanes offer outstanding gloss and color retention, good chemical resistance, and excellent adhesion. The long coating service life of fluoro-urethanes reduces the frequency of maintenance work and subsequent downtime interruption.
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Wood, Timothy G. "Self-Crosslinking Acrylic Polymers for Industrial Finishes: Waterborne Alternatives to Solventborne Urethanes." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94595.

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Abstract Solventborne coatings, such as those based on two-pack urethanes, have found extensive use in high performance industrial finishing applications. These coatings offer excellent gloss, weatherability and resistance properties, due to their ability to crosslink after application. Recently, one-pack, waterborne, self-crosslinking acrylic polymers, which offer many of the properties associated with urethanes, have been developed. These systems represent environmental-and user-friendly alternatives to the urethane coatings.
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Schall, Donald C. "New High Solids Acrylic Technologies for High Performance Topcoats: Alternatives to Acrylic Urethane Coatings." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90553.

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Abstract Acrylic urethanes have set a standard for high performance topcoats by virtue of their long lasting resistance and appearance properties. Such a high level of performance has made acrylic urethanes attractive to an ever increasing share of various coatings markets, including maintenance coatings. Naturally, this technology is not without its shortcomings, not the least of which are the health concerns associated with the isocyanate resins (HDI prepolymers) used in these coatings. These urethane paint vapors and mists can irritate the respiratory tract and repeated overexposure can lea
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Ford, Jerry V. "Applications for 100% Solids Urethane Elastomers." In CORROSION 1989. NACE International, 1989. https://doi.org/10.5006/c1989-89086.

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Abstract From their development in the pre World War II era as a synthetic rubber, urethane elastomers have been extensively utilized as a cast rubber like material. Only in the past fifteen years or so has the plural component spray technology been used to pump, meter, mix, atomize and apply 100% solids urethane elastomers. The key to application is their ability to be applied in thick coats. 100% solids urethanes are chemically curing as opposed to traditional carrier evaporation paints and coatings. This chemical cure time can be varied by adding catalyst to one of the components. Fast reac
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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.

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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
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Capino, Liza A. "Moisture Curing Urethanes Meeting the Needs of the Bridge and Highway Market." In SSPC 2000. SSPC, 2000. https://doi.org/10.5006/s2000-00006.

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Abstract Moisture curing urethane technology offers a unique blend of heavy duty corrosion protection, surface tolerance, low temperature cure capability and exterior gloss and color durability. These properties make them ideal candidates for the Bridge and Highway Market.
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Boova, A. A. "Decorative Protective Flooring Systems." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90346.

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Abstract Today's flooring systems are decorative as well as protective and are available in a multitude of colors, textures and thicknesses. Concrete sealers, hi-build compounds, monolithic toppings, polymer concretes, brick and tile will be presented. Many of these systems are formulated from such resins as acrylics, epoxies, furans, polyesters, urethanes and vinyl esters. Various attributes of the respective systems are presented.
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Tinsley, R. G. "Isocyanate Free Urethanes; a New Class of Coating System for Corrosion Resistant Finishes." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94600.

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Abstract As part of an ongoing effort to develop lower toxicity, more environmentally benign coatings binder systems, a series of polymers using a novel Michael Addition reaction cure mechanism, has been developed. For the cross-linking system, a number of lower molecular weight polymers with acceptor sites have been developed. They include in the polymer chain a significant amount of prereacted polyurethane, thereby giving the cured coating the familiar properties of a high quality standard polyurethane system. The chemistry of the cure mechanism is discussed pointing out the similarities and
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Langhals, Tom, Gene Heitmeyer, Ryan Smith, and Chad Sellman. "Decision Making Process for Applying Military Coatings (Carc-Chemical Agent Resistant Coating, Epoxies, Urethanes, and Others)." In SSPC 2011. SSPC, 2011. https://doi.org/10.5006/s2011-00031.

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This a basic profile to help in making a decision if getting into the Military coating business is good for you. Its purpose is to enhance ones thought process and learning techniques regarding some of the following considerations before taking that leap: Are you already applying liquid paint and/or powder coatings?The experience of your personnel.Is documentation and written procedures part of your norm?Do you have a quality system in place (ISO or TS certified)?Are you aware of your areas environmental regulations?Type of equipment needed.Do you have abrasive and/or chemical cleaning availab
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Langhals, Tom, Gene Heitmeyer, Ryan Smith, and Chad Sellman. "Decision Making Process for Applying Military Coatings (CARC-Chemical Agent Resistant Coating, Epoxies, Urethanes, and Others." In Paint and Coatings Expo (PACE) 2010. SSPC, 2010. https://doi.org/10.5006/s2010-00026.

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This a basic profile to help in making a decision if getting into the Military coating business is good for you. Its purpose is to enhance ones thought process and learning techniques regarding some of the following considerations before taking that leap: Are you already applying liquid paint and/or powder coatings?The experience of your personnel.Is documentation and written procedures part of your norm?Do you have a quality system in place (ISO or TS certified)?Are you aware of your areas environmental regulations?Type of equipment needed.Do you have abrasive and/or chemical cleaning availab
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Reports on the topic "Urethanes"

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Beck Tan, Nora C., Eugene Napadensky, James M. Sloan, Sharon Ma, and Stuart L. Cooper. Transparent Barrier Urethanes Based on Polyethylene Soft Segments. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada382417.

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McGee, William W. Chemical Hazards Associated with the Handling of Urethanes: A Literature Search. Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada265904.

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Watson, D. R. Urethane foam process improvements. Final report. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/41306.

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Edgar, Alexander S. Degradation Mechanisms of Poly(ester urethane) Elastomer. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1411335.

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Beitelman, Alfred D. Laboratory Evaluation of Moisture Cure Urethane Coatings. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada418758.

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Lafreniere, Robert A., and Roger Tryon. Dynamic Measurements of Three Urethane Hose Materials. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada640492.

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Feuer, Henry O., Touchet Jr., and Paul. Failure Mechanism of Urethane Elastomer Coated Fabric Collapsible Fuel Tanks. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada221033.

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DelCul, Guillermo D., C. M. Simmons, Alan S. Icenhour, and D. Singh. Radiolytic Degradation of Urethane Foam Used for Encapsulation of Contaminated Componets. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/1096986.

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Casem, Daniel T., and Alex J. Hsieh. Plate-Impact Measurements of a Select Model Poly(urethane urea) Elastomer. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada585929.

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L. Domeier, P. Keifer, and M. Hunter. Urethane Elastomers: Development of TDI-Free Replacement Materials for EN-7. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/766630.

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