文献类型：期刊文献

英文题名：Crystallinity and hydrogen bonding of hard segments in segmented poly(urethane urea) copolymers

作者：Luo, N.[1]; Wang, D.-N.[1]; Ying, Sh.-K.[1]

机构：[1]E CHINA UNIV CHEM TECHNOL,INST MAT & SCI & ENGN,SHANGHAI 200237,PEOPLES R CHINA

年份：1996

卷号：37

期号：16

起止页码：3577

外文期刊名：POLYMER

收录：;EI(收录号：1996443331048);WOS:【SCI-EXPANDED(收录号:WOS:A1996VA99300012)】；

语种：英文

外文关键词：poly(urethane urea); hydrogen bonding; crystallite

摘要：Polyurea hard segment model compounds and a series of segmented poly(urethane urea) (SPUU) copolymers, with hard segment content ranging from 18.8-91.0%, were synthesized based on 4,4'-diphenylmethane diisocyanate (MDI), 3,5-diethyltoluenediamine (DETDA), and ethylene-oxide-capped poly(propylene oxide) polyether diol (PPO). By analysis of model compounds, crystallization of DETDA-MDI hard segments was confirmed and relationships between urea hydrogen bonding with morphological changes were suggested. The crystallization, however, was not complete in the copolymers even when the hard segment content was high. New spectral evidence for phase inversion is presented. Fourier transform infra-red analysis suggested that the equilibrium of urea hydrogen bonding between crystalline region and amorphous regions was affected mainly by morphological changes (phase inversion) and was almost independent of chemical composition of the SPUU copolymers under certain morphological conditions both before and after phase inversion. Copyright (C) 1996 Elsevier Science Ltd.