Reversible switching of polymeric gel structure and property by solvent exchange  

通过溶剂置换可逆切换高分子凝胶的结构与性能

作　　者：Liju Xu Dong Qiu 徐礼桔;邱东(Beijing National Laboratory for Molecular Sciences,Laboratory of Polymer Physics and Chemistry,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Beijing National Laboratory for Molecular Sciences,Laboratory of Polymer Physics and Chemistry,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Materials》2022年第2期547-552,共6页中国科学（材料科学（英文版）

基　　金：supported by the National Basic Research Program(2017YFC1103300);the National Natural Science Foundation of China(51773209)。

摘　　要：The distinctive attributes of the dynamic polymeric gels,such as configurable mechanical behavior[1-6],external stimuliresponsiveness[7-13]and self-healing ability[14-17],underlie their extensive applications in materials science,ranging from tissue-adaptive biomaterials[18-20]through high-efficient energy materials[21-23]to intelligent information materials[24-26].For instance,stiffness-changing trait(e.g.,rigid-to-soft transition)is especially desired in medical devices,since the rigid state allows for the easy insertion,while the soft state favors biocompatibility with surrounding tissues[19,27].动态自适应高分子凝胶具备可逆转变的特性,如可切换的力学状态,因而具有更多样化的功能及应用,受到广泛关注.然而,大多数现有材料的可切换状态或可逆转变能力有限.本文利用高分子-高分子间相互作用与高分子-溶剂间相互作用的竞争,发展了一种溶剂置换策略来可逆切换动态凝胶的交联网络结构及其力学性能.当高分子-高分子间相互作用优于高分子-溶剂间相互作用时,高分子网络由松散的交联模式转变为密集的交联模式,此时,凝胶从软弱的状态转变为强韧的状态.这种转变可以通过恢复高分子-溶剂间相互作用而逆转.此外,该力学性能可调的高分子凝胶在极端条件下还表现出不干燥和抗冻的性质.这项工作提出了一种简单而高效的可逆调控高分子凝胶结构与性能的策略,并为设计开发智能和适应性凝胶材料提供了理论基础.

关 键 词：高分子凝胶 凝胶材料 交联网络结构 分子间相互作用 力学状态 溶剂置换 极端条件 高分子网络 

分 类 号：O648.17[理学—物理化学]