Mechanical Properties and Self-healing Behavior of Thermo-reversible Polyurethane-modified Self-healing Epoxy Resins
YE Jiaofeng1, WANG Fei1, ZHANG Junxiang1, ZUO Yang1, FENG Libang1,*, LUO Xiaoxiao2
1 School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China
Abstract: A thermo-reversible polyurethane-modified self-healing epoxy resin was manufactured successfully through introducing thermo-reversible polyurethane into Diels-Alder reaction-based self-healing epoxy resin. The bending behavior, impact toughness and self-healing performance of self-healing epoxy resin were reinforced prominently when thermo-reversible polyurethane was introduced. The thermo-reversible polyurethane-modified self-healing epoxy resin material exhibited the optimal performance when the introduced amount of thermo-reversible polyurethane was 20%. Cracks could be renovated by heat-treating at 130 ℃ for 12 min and 85 ℃ for 24 h once thermo-reversible polyurethane-modified self-hea-ling epoxy resin was damaged on account of external factors and cracks appeared. Moreover, the repair could be repeated. Results revealed that the repeated self-healing behavior was implemented by reason of synergistic effect of thermo-reversible Diels-Alder reaction, dissociation and regeneration of hydrogen bonds as well as thermal movement of molecular chains. The results had significant instruction for fabricating epoxy resin materials with both strong impact toughness and self-healing for micro-damages efficiently.
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