文献类型：期刊文献

英文题名：STRUCTURAL STABILIZATION OF PHASE-SEPARATING PC POLYESTER BLENDS THROUGH INTERFACIAL MODIFICATION BY TRANSESTERIFICATION REACTION

作者：YOON, H; FENG, Y; QIU, Y; HAN, CC

机构：[1]E CHINA UNIV CHEM TECHNOL,DEPT POLYMER SCI & ENGN,SHANGHAI,PEOPLES R CHINA

年份：1994

卷号：32

期号：8

起止页码：1485

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

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1994NM08100020)】；

语种：英文

外文关键词：POLYMER BLEND; PHASE SEPARATION; TRANSESTERIFICATION; INTERFACIAL STRUCTURE

摘要：Competition between phase separation and transesterification in immiscible polymer blends of polycarbonate (PC) and a copolyester (PET) is studied as a function of time and temperature by differential scanning calorimetry (DSC) and small-angle neutron scattering (SANS). We found that (1) Global structure coarsens at T less-than-or-equal-to 200-degrees-C due to the dominance of phase separation over transesterification and melts at T greater-than-or-equal-to 220-degrees-C due to the dominance of transesterification at the domain interface. However, transesterification is slow but still significant even at T less-than-or-equal-to 200-degrees-C. (2) An intricate balance of transesterification and phase separation rates controls global and interfacial structures. (3) Interfacial structures become measurable under certain conditions, and the interfacial thickness between PC or PET and the copolymers generated by transesterification increases with time. (4) DSC results are consistent with results obtained by SANS, but the latter is more sensitive than the former and differentiates the structural change at different length scales caused by phase separation and transesterification. (C) 1994 John Wiley & Sons, Inc.