Covalently Cross-Linked and Mechanochemiluminescent Polyolefins Capable of Self-Healing and Self-Reporting  

作　　者：Yakui Deng Yuan Yuan Yulan Chen 

机构地区：[1]Tianjin Key Laboratory of MolecularOptoelectronic Science,Department of Chemistry,Tianjin University,Tianjin 300354

出　　处：《CCS Chemistry》2021年第5期1316-1324,共9页中国化学会会刊（英文）

基　　金：This research was made possible as a result of a generous grant from the National Key Research and Development Program of China(grant nos.2017YFA0207800 and 2017YFA0204503);the National Natural Science Foundation of China(grant nos.21975178 and 21734006).

摘　　要：Compared with non-cross-linked and dynamically covalent polymers,covalently cross-linked networks are irreplaceableinmany areas;however,they aredifficult to repair once fractured,due to limited polymer chain diffusion after cross-linking.Herein,the authors have reported a newkind of permanently cross-linked polyolefin,which when attached with amide side groups,yieldmechanically robust yet readily repairablematerials.A key is to use low cross-linking density,which enables satisfactory elasticity and chain mobility for thermodynamically favored healing.Another key is to incorporate dense hydrogen bonds that can undergo reversible associations.These factors jointly promise polyolefin networks with good mechanical properties and self-healing performance(recovered spontaneously up to 96%of its original tensile strength).More importantly,by means of mechanochemiluminescence from 1,2-dioxetane,which serves as the cross-linker and built-in self-reporting stress probe,a microscopic evaluation of how the chain entanglement proceeds upon healing and how failure occurs in the network can be obtained.

关 键 词：SELF-HEALING SELF-REPORTING POLYOLEFINS covalently cross-linked mechanochemiluminescence 

分 类 号：O63[理学—高分子化学]