文献类型：期刊文献

英文题名：Glass transition and scratch resistance of bisphenol C-modified polycarbonates

作者：Zhang, Jie[1];Wang, Hui[1];Wang, Jinsen[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：2025

卷号：336

外文期刊名：POLYMER

收录：;EI(收录号：20253118901820);WOS:【SCI-EXPANDED(收录号:WOS:001545454500002)】；

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

语种：英文

外文关键词：Bisphenol C; Polycarbonate; Scratch resistance; Glass transition; Fragility

摘要：This study prepared copolycarbonates with varying bisphenol A (BPA)/bisphenol C (BPC) molar ratios via melt transesterification. Increasing BPC content reduces both Tg and dynamic fragility (m) of PC. A more pronounced decrease in m was observed, causing m/Tg to significantly decline from 0.42 to 0.25, which indicates BPC enhances molecular chain packing efficiency of PC during glass transition. By measuring density, characterizing /3 relaxation behavior and quantifying the /3 relaxation activation energy, we demonstrated the formation of more densely packed chains in glassy copolycarbonates. On the other side, the incorporation of BPC units substantially increased compressive yield strength with only a slight decline in the strain hardening modulus, resulting in significantly enhanced scratch resistance. Fundamentally, the enhanced scratch resistance of the copolycarbonates originates from BPC segments promoting molecular efficient packing during glass transition, thereby enhancing the compressive yield strength.