文献类型：期刊文献

英文题名：Phase separation in segmented poly(urethane urea) copolymers during reaction injection molding (RIM) polymerization

作者：Luo, N; Wang, DN; Ying, SK

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

年份：1997

卷号：35

期号：6

起止页码：865

外文期刊名：JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1997WQ33000001)】；

语种：英文

外文关键词：poly(urethane urea); phase separation; FTIR spectroscopy; reaction injection molding; domain size

摘要：In situ experiments were performed with a portable RIM(reaction injection molding) minimachine interfaced to an FTIR spectrophotometer to follow the reaction chemistry and monitor phase separation of copoly(urethane urea)s during RIM polymerization. The PUU copolymers were based on ethylene oxide-capped poly(propylene oxide) polyether diol, 3,5-diethyltoluenediamine (DETDA), and uretonimine liquefied 4,4'-diphenylmethane diisocyanate. The effect of catalyst concentration on the degree of phase separation in the as-molded RIM PUU copolymers was investigated by using differential scanning calorimetery and scanning electron microscopy as supplementary methods. The results suggested that an increase of degree of phase separation and a decrease of the size of hard-segment-rich domains take place with a rise of catalyst concentration. The morphological feature was a consequence in combination with the increase in relative rate of urethane formation and the ordering of hydrogen bonding through urea groups. (C) 1997 John Wiley & Sons.