Flexible Self-healing Cross-linked Polyamides Synthesized Through Bulk Michael Addition,Polycondensation,and Diels-Alder Reaction  

作　　者：YANG Shengqing ZHAO Jinnan CHEN Shuo ZHAO Jingbo 

机构地区：[1]Key Laboratory of Carbon Fiber and Functional Polymers,Ministry of Education,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing,100029,P.R.China

出　　处：《Chemical Research in Chinese Universities》2022年第4期968-973,共6页高等学校化学研究（英文版）

基　　金：supported by the Beijing Natural Science Foundation,China(No.2182056).

摘　　要：Three new thermally responsive self-healing cross-linked polyamides(cPA-FU-DAs)with good tensile strength and toughness were synthesized through bulk Michael addition,polycondensation,and Diels-Alder reaction.Unlike common stable polymers,cPA-FU-DAs can seal cracks by mere heating.First,the Michael addition of methyl acrylate and furfurylamine was conducted,and a furfurylamine-diester(FU-DE)was prepared.FU-DE was transformed into polyamide prepolymers that contained furfuryl pendant groups(PA-FUs)through bulk polycondensation with a poly(propylene glycol)(PPG)diamine and a PPG triamine.PA-FUs were crosslinked by bismaleimide,and cPA-FU-DAs were prepared.The Michael addition was monitored by Fourier transform infrared spectroscopy and electrospray ionization mass spectroscopy.The reverse DA reaction of the cPA-FU-DAs was demonstrated by differential scanning calorimetry and dissolution property.Their thermally self-healing properties were verified by polarizing optical microscopy and tensile test.The cPA-FU-DAs exhibited good mechanical properties and high self-healing efficiency.They self-healed at 130°C.The tensile strength after repairing was up to 19 MPa with self-healing efficiency reaching 92%.

关 键 词：SELF-HEALING Cross-linked polyamide Michael addition Diels-Alder reaction POLYCONDENSATION 

分 类 号：O63[理学—高分子化学]