文献类型：期刊文献

英文题名：Non-Phosgene Polycondensation and Molecular Structure Regulation of Polycarbonate-Polydimethylsiloxane Copolymers

作者：Wang, Hui[1];Zhang, Jie[1];Wang, Xinyu[1];Wang, Jinsen[1];Wu, Guozhang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai, Peoples R China

年份：2025

卷号：63

期号：18

起止页码：3661

外文期刊名：JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20252618696837);WOS:【SCI-EXPANDED(收录号:WOS:001516524500001)】；

基金：This research was supported by the National Natural Science Foundation of China (51873063).

语种：英文

外文关键词：molecular structure; PDMS sequence; polycarbonate; polydimethylsiloxane; transesterification

摘要：Polycarbonate-polydimethylsiloxane (PC-PDMS) copolymers were synthesized via a melt transesterification process, and the effects of PDMS chain length, end-group, and polymerization degree on molecular structure and optical clarity were systematically investigated. The results demonstrate that the formation of the PDMS-PDMS sequence, which causes optical opacity of the copolymer, is synergistically governed by thermodynamic compatibility between PC and PDMS blocks and the dynamic covalent nature of carbonate groups. A shorter PDMS chain length or longer polyether-modified termini enhances the compatibility among monomers and oligomers, thus suppressing PDMS-PDMS accumulation during the polymerization. We found that the formation of the PDMS-PDMS sequence is triggered at the polycondensation stage. Furthermore, reactive blending of a PDMS-PDMS-free PC-PDMS copolymer with alkali metal catalysts derives high amounts of PDMS-PDMS segments, accompanying a gradual transition from optical transparency to opacity. AFM imaging revealed that PDMS blocks aggregate into large domains as PDMS-PDMS content increases. We further confirmed that the PDMS-PDMS content is saturated at a given ratio that is independent of the total PDMS loading and catalyst activity.