Spinodal dynamics of metastable glass transition domains in amorphous polymer towards thermomechanically tailorable shape memory effect  

作　　者：LIU JingYun LU HaiBao FU Yong-Qing 

机构地区：[1]Science and Technology on Advanced Composites in Special Environments Laboratory,Harbin Institute of Technology,Harbin 150080,China [2]Faculty of Engineering and Environment,Northumbria University,Newcastle upon Tyne,NE18ST,UK

出　　处：《Science China(Technological Sciences)》2023年第8期2432-2440,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11725208,12172107);the International Exchange Grant(Grant No.201078)。

摘　　要：Glass transition plays a critical role to determine the dynamic behaviors of amorphous shape memory polymers(SMPs).However,the fundamental relationships between shape memory effect(SME)and dynamic glass transition have not been well understood,even though this topic has been studied for decades.In this study,we apply a mean-square displacement function of Adam-Gibbs(AG)domain size model to explore metastable glass transition between normal glass state and rubbery state of amorphous SMPs,based on both mode-coupling theory and mean-field model.A statistic viscosity equation is formulated to study the dynamic glass transition of metastable AG domains in an amorphous SMP.A dynamically spinodal model is also developed to connect dynamic glass transitions to thermomechanical processes,based on statistic viscosity equation and phase transition model.Furthermore,using the spinodal models,multiple shape memory behaviors have been predicted for amorphous SMPs with dual-,triple-and quadruple-SMEs,resulted from their different routes of themomechanical evolutions.Finally,the proposed models are verified using the experimental data reported in literature.

关 键 词：shape memory polymer glass transition DYNAMICS METASTABLE 

分 类 号：TQ317[化学工程—高聚物工业]