The Influence of Entanglements of Net Chains on Phase Transition Temperature of Sensitive Hydrogels in Chemo-Mechanical Coupled Fields  

作　　者：Tao Li Qingsheng Yang Lianhua Ma Xiaojun Zhang 

机构地区：[1]Department of Engineering Mechanics,Beijing University of Technology,Beijing,100124,China [2]College of Civil Engineering and Architecture,Hebei University,Baoding,071002,China

出　　处：《Computer Modeling in Engineering & Sciences》2020年第6期995-1014,共20页工程与科学中的计算机建模（英文）

基　　金：support from the National Natural Science Foundation of China(Grant Nos.11520007,11572109 and 11632005);the Hebei Natural Science Foundation of China(Grant No.A2016201198);technology research in Colleges and Universities of Hebei Province(Grant No.ZD2017006)are gratefully acknowledged。

摘　　要：Phase transition of hydrogel,which is polymerized by polymer network,can be regarded as the transition of polymer network stability.The stability of the polymer network might be changed when the external environment changed.This change will lead to the transformation of sensitive hydrogels stability,thus phase transition of hydrogel take place.Here,we present a new free density energy function,which considers the non-gaussianity of the polymer network,chains entanglement and functionality of junctions through adding Gent hyplastic model and Edwards-Vilgis slip-link model to Flory-Huggins theory.A program to calculate the phase transition temperature was written based on new free energy function.Taking PNIPAM hydrogel as an example,the effects of network entanglement on the phase transition temperature of hydrogel were studied by analyzing the microstructure parameters of the hydrogel networks.Analytical results suggest a significant relationship between phase transition temperature and entanglement network.

关 键 词：Sensitive hydrogel ENTANGLEMENTS phase transition chemo-mechanical coupling fields. 

分 类 号：O63[理学—高分子化学]