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Appl. Sci. 2018, 8(9), 1587;

Synthesis of Thermally Stable Reactive Polyurethane and Its Physical Effects in Epoxy Composites

Center for Chemical Industry Development, Korea Research Institute of Chemical Technology, 45, Jongga-ro, Yugok-dong, Jung-gu, Ulsan 44412, Korea
School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Korea
Authors to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 16 August 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Selected Papers from IUMRS-ICEM 2018)
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A flame retardant polyol (EP-DOPO) with epoxy functional groups was synthesized by reacting a 1,6-hexanediol glycidyl ether with a flame retardant 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phospha-phenanthrene-10-oxide (DOPO). The polyurethane (EPPU) with enhanced heat resistance was prepared by the reaction of a polyol blend of EP-DOPO and polytetrahydrofuran (PolyTHF) at a ratio of 1:1 with isophorone diisocyanate. EPPU useful for the preparation of cables or coatings showed higher thermal decomposition temperature rather than that of reference polyurethane synthesized by the reaction between pure PolyTHF and isophorone diisocyanate by thermogravimetric analysis. Further study of the polyurethane as a toughening agent for epoxy polymers was carried out. Epoxy compositions consisting of bisphenol A epoxy resin and dicyandiamide as a hardener have a brittle property allowing crack propagation after cure. Polyurethane plays an important role as an impact modifier to prevent from cracks of epoxy polymers. Various contents of EPPU were added into epoxy compositions to measure the physical property changes of epoxy polymers. The tensile and flexural strengths of the cured specimen were compared with those of epoxy compositions including reference polyurethane. Furthermore, the crosslink density of the cured epoxy compositions was compared. View Full-Text
Keywords: polyurethane; flame retardant; epoxy; crosslink density; impact resistance polyurethane; flame retardant; epoxy; crosslink density; impact resistance

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kim, J.H.; Lee, W.; Kim, T.; Kim, H.-G.; Seo, B.; Lim, C.-S.; Cheong, I.W. Synthesis of Thermally Stable Reactive Polyurethane and Its Physical Effects in Epoxy Composites. Appl. Sci. 2018, 8, 1587.

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