In Situ Self-growing of Thermoplastics into Strong and Tough Thermosets Based on Dynamic Imidazole-urea Moiety  

作　　者：Jian-Ye Zhang Xin-Yu Xu Qiao Sun Ling Liu Zeng-He Liu Yu-Tian Zhu 

机构地区：[1]College of Material,Chemistry and Chemical Engineering,Key Laboratory of Organosilicon Chemistry and Material Technology,Ministry of Education,Hangzhou Normal University,Hangzhou 311121,China

出　　处：《Chinese Journal of Polymer Science》2025年第3期488-494,共7页高分子科学(英文版)

基　　金：financially supported by the Natural Science Foundation of Zhejiang Province(No.LQ24B040004)。

摘　　要：Thermosets are indispensable to our daily life,but their crosslinked structures make them unable to be processed by the melt processing like thermoplastics,which greatly limits their shape designs and applications.Herein,we address this challenge via an in situ self-growing strategy,i.e.utilizing the dynamic imidazole-urea moiety to suck up and integrate epoxy into the materials and making the thermoplastics grow in situ into thermosets.With this strategy,thermosets can be readily processed via hot-melt extrusion molding,including melt spinning and fused deposition modeling 3D printing.More importantly,this strategy simultaneously integrates the flexibility of polyurethane and the robustness of epoxy resin into the resulting thermosets,yielding a mechanical-reinforcing effect to make the material not only strong but also tough(toughness:99.3 MJ·m^(-3),tensile strength:38.8 MPa).Moreover,the crosslinking density and modulus of the as-prepared thermosets(from 34.1 MPa to613.7 MPa)can be readily tuned on demand by changing the growth index.Furthermore,these thermosets exhibited excellent thermal stability and chemical resistance.

关 键 词：Dynamic bond Self-growing Imidazole-urea THERMOSET 

分 类 号：TG1[金属学及工艺—金属学]