Glass transition behaviors of a polyurethane hard segment based on 4,4'-diisocyanatodiphenylmethane and 1,4-butanediol and the calculation of microdomain composition

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Title:	Glass transition behaviors of a polyurethane hard segment based on 4,4'-diisocyanatodiphenylmethane and 1,4-butanediol and the calculation of microdomain composition
Authors:	Chen,TK;Chui,JY;Shieh,TS
Contributors:	化學工程與材料工程學系
Keywords:	BLOCK COPOLYMERS;PHASE-SEPARATION;POLYMER MIXTURES;TEMPERATURES;POLYOLEFIN;LENGTH
Date:	1997
Issue Date:	2010-06-29 17:30:54 (UTC+8)
Publisher:	中央大學
Abstract:	The long-term confusing glass transition temperature, T-g, and specific heat capacity, Delta C-p, of the 4,4'-diisocyanatodiphenylmethane (MDI) and 1,4-butanediol (ED) hard segment in segment polyurethanes have been clearly evidenced by using a new series of completely phase-mixed polyurethanes while being extrapolated to 100% hard segment content. The hard segment T-g and Delta C-p, thus obtained are 108 degrees C and 0.38 J/g degrees C, respectively, which are equivalent to the reported Tg and Delta C-p of a high molecular weight MDI-BD homopolymer. In addition, if a single homogeneous phase is present, the observed Delta C-p and T-g are found to be given by the linear weighted combination of the pure constituent values. This provides a simple relationship to access the composition of the individual microdomain in segment polyurethanes, providing that the phase-separate morphology does not affect the microdomain glass transition behavior.
Relation:	MACROMOLECULES
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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