科研之友
微信
新浪微博
Facebook
分享链接
摘要
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-healing 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. ? 2023 Cailiao Daobaoshe/ Materials Review.
- 单位
