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|標題:||Facile Preparation of Novel Epoxy Curing Agents and Their High-Performance Thermosets||作者:||Lin, C.H.
|關鍵字:||curing agents;curing of polymers;flame-retardance;high performance;polymers;high T(g);thermosets;phosphorus-containing epoxy;glass-transition temperatures;flame-retardant;diglycidyl ether;phosphine oxide;containing polymers;bisphenol-a;resins;polyimides;spiroorthoester||Project:||Journal of Polymer Science Part a-Polymer Chemistry||期刊/報告no：:||Journal of Polymer Science Part a-Polymer Chemistry, Volume 46, Issue 23, Page(s) 7898-7912.||摘要:||
Two flame-retardant epoxy curing agents, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-tris(4-hydroxyphenyl)methane (1) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl- (4-aminophenyl)-bis(4-hydroxyphenyl)methane (2), were prepared by a facile, economic, one-pot procedure. The structures of the curing agents were confirmed by IR, high-resolution mass, 1-D, and 2-D NMR spectra. A reaction mechanism was proposed for the preparation, and the effect of electron withdrawing/donating effects on the stabilization of the carbocation was discussed. (1-2) served as curing agents for diglycidyl ether of bisphenol A (DGEBA), dicyclopentadiene epoxy (HP-7200), and cresol novolac epoxy (CNE). Properties such as glass transition temperature, coefficient of thermal expansion, thermal decomposition temperature, and flame retardancy of the resulting epoxy thermosets were evaluated. The resulting epoxy thermosets show high T(g) low thermal expansion, moderate thermostability, and excellent flame retardancy. The bulky biphenylene phosphinate pendant makes polymer chains difficult to rotate, explaining the high T, and low thermal expansion characteristic. (C) 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7898-7912, 2008
|Appears in Collections:||化學工程學系所|
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