Recyclable and Self-healable Polydimethylsiloxane Elastomers Based on Knoevenagel Condensation  

作　　者：Yao-Wei Zhu Tong-Tong Man Ming-Ming Zhao Jia-Yi Chen Yu Yan Xiao-Nong Zhang Li Chen Chun-Sheng Xiao 

机构地区：[1]Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun,130022,China [2]Department of Chemistry,Northeast Normal University,Changchun,130024,China

出　　处：《Chinese Journal of Polymer Science》2025年第1期53-60,I0007,共9页高分子科学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.51973025 and 52222307);Jilin Science and Technology Bureau(Nos.20220204107YY and 20230204086YY);Changchun Science and Technology Bureau(No.21ZGY06);Jilin Province Development and Reform Commission(No.2023C028-4).

摘　　要：Elastomers are widely used in various fields owing to their excellent tensile properties.Recyclable and self-healing properties are key to extending the service life of elastomers.Accumulating evidence indicates that dynamic covalent chemistry has emerged as a powerful tool for constructing recyclable and self-healing materials.In this work,we demonstrate the preparation of a recyclable and self-healable polydimethylsiloxane(PDMS)elastomer based on the Knoevenagel condensation(KC)reaction.This PDMS elastomer was prepared by the KC reaction catalyzed by 4-dimethylaminopyridine(DMAP).The obtained PDMS elastomer exhibited an elongation at break of 266%,a tensile strength of 0.57 MPa,and a good thermal stability(Td=357℃).In addition,because of the presence of dynamic C=C bonds formed by the KC reaction and low glass transition temperature(Tg=-117℃).This PDMS exhibited good self-healing and recycling properties at room temperature and could be reprocessed by hot pressing.In addition,the PDMS elastomer exhibits good application prospects in the fields of adhesives and flexible electronic devices.

关 键 词：Dynamic covalent chemistry ELASTOMER Knoevenagel condensation reaction POLYDIMETHYLSILOXANE RECYCLABLE SELF-HEALING 

分 类 号：TQ334[化学工程—橡胶工业]