Elongational Flow-induced Crystallization of Poly(L-lactic acid)Telechelic Ionomers  

作　　者：Fan Liu Shao-Yong Huang Jian Tang Quan Chen 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China

出　　处：《Chinese Journal of Polymer Science》2024年第12期1957-1965,I0010,共10页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.22173095).

摘　　要：In this study,we prepared unentangled and slightly entangled poly(L-lactic acid)telechelic ionomer samples(Mn=5 and 16 kg/mol)based on sodium sulfonate groups.The telechelic samples exhibit extremely slow crystallization kinetics below the melting temperature T_(m) and above the glass transition temperature T_(g),which enables us to examine the linear viscoelasticity of the ionomer melt samples therein.The application of either the shear flow(at 85℃)or elongational flow(between 70 and 90℃)strongly accelerates the crystallization,leading to strong strain hardening and formation of highly orientedαcrystals.Depending on the relative average rates of the strain-induced dissociation and strain-induced crystallization,the stress evolution can be classified into two cases,and the critical work for strain-induced crystallization is higher in case where the strain-induced dissociation occurs earlier than the strain-induced crystallization.

关 键 词：Polylactides telechelic ionomers Flow-induced crystallization Strain-induced dissociation 

分 类 号：TQ317[化学工程—高聚物工业] TQ026.5