文献类型：期刊文献

英文题名：Reactive blending and transesterification-induced degradation of isosorbide-based polycarbonate blends

作者：Lai, Wenqin[1];Wu, Guozhang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2019

卷号：162

起止页码：201

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20190906566189);WOS:【SCI-EXPANDED(收录号:WOS:000465055500023)】；

基金：This research was supported by the"973"project (grant number 2013CB035505) and the National Natural Science Foundation of China (grant number 51373053).

语种：英文

外文关键词：Transesterification; Degradation; Isosorbide-based polycarbonate; Reactive blending

摘要：We report the reaction of bio-renewable isosorbide-based polycarbonate (IcC-PC) with poly(bisphenol A carbonate) (BPA-PC) by melt-blending in the presence of dibutyltin dilaurate (DBTDL). The blends formed copolymers and transformed into transparent alloys with a single T-g after melt-blending. A remarkable reduction in molecular weight was observed in the reactively blended products. H-1 NMR and C-13 NMR results showed that the carbonate group of IcC-PC is less vulnerable to nucleophilic attack than that of BPA-PC and that transesterification is initiated by the exchange reaction between the laurate ligands of DBTDL and the carbonate groups of BPA-PC. Tin-containing BPA-PC chains were proposed to react with the carbonate group of IcC-PC via a coordination-insertion mechanism to produce the (IcC-PC)-(BPA-PC) copolymer. The hydroxyl end-groups of IcC-PC were also involved in transesterification under the catalysis of dibutyltin compounds and converted into low-reactive phenolic end-groups of BPA-PC. Degradation in the IcC-PC/BPA-PC blends after adding DBTDL was mainly caused by the exchange reaction between DBTDL and BPA-PC, hydrolysis, and phenolysis of IcC-PC and BPA-PC under the catalysis of dibutyltin compounds. Among these reactions, hydrolysis played the major role and occurred mostly at the BPA-PC chains. (C) 2019 Elsevier Ltd. All rights reserved.