How Polydispersity of Network Polymers Influences Strain-induced Crystal Nucleation in a Rubber  

作　　者：Miao-miao Zhang Li-yun Zha Huan-huan Gao Yi-jing Nie 胡文兵 

机构地区：[1]Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University

出　　处：《Chinese Journal of Polymer Science》2014年第9期1218-1223,共6页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.20825415 and 21274061);National Basic Research Program of China(No.2011CB606100);Program for Changjiang Scholars and Innovative Research Teams in Universities

摘　　要：Network polymers in a rubber or a gel often contain non-uniform chain lengths. By means of dynamic Monte Carlo simulations of polymer mixtures with various compositions of two chain lengths, we investigated how the factor of polydispersity influences their strain-induced crystal nucleation. Under a high temperature and a high strain rate, the stretching of both polymers revealed that crystal nucleation is mainly accelerated by the presence of short-chain polymers; nevertheless, both polymers join together in the nucleation process. Further analysis proved that crystal nucleation is initiated from those highly stretched short segments, which are rich on the short-chain polymers.Network polymers in a rubber or a gel often contain non-uniform chain lengths. By means of dynamic Monte Carlo simulations of polymer mixtures with various compositions of two chain lengths, we investigated how the factor of polydispersity influences their strain-induced crystal nucleation. Under a high temperature and a high strain rate, the stretching of both polymers revealed that crystal nucleation is mainly accelerated by the presence of short-chain polymers; nevertheless, both polymers join together in the nucleation process. Further analysis proved that crystal nucleation is initiated from those highly stretched short segments, which are rich on the short-chain polymers.

关 键 词：CRYSTALLIZATION RUBBER POLYDISPERSITY Molecular simulation. 

分 类 号：O631.12[理学—高分子化学]