Self-Healable Epoxy Vitrimer Crosslinked With Dual-Networks
Keywords:
Epoxy vitrimer, Self-healing, Stress relaxationAbstract
Epoxy is a widely used coating for protecting metal materials, but epoxy coatings are generally not self-healing when there are cracks or scratches on the coating layer. To solve these problems, new kind of epoxy has been developed. Epoxy vitrimer has various smart functions such as self-healing, reprocessing, self-welding has been used for various applications. In this research, the epoxy vitrimer containing dual networks is studied. Two curing agents viz, cashew nut shell liquid (CNSL) and 4-aminophenyl disulfide (AFD) were used for preparation of epoxy vitrimer. The effect of AFD content on self-healing ability and other properties were investigated. The epoxy vitrimer cured with CNSL and AFD showed two-stages curing process at temperature of 161 - 170 °C and 195 - 200 °C. The stress relaxation time of epoxy vitrimer decreased with increasing AFD content. The highest self-healing efficiency was found to be 96% for epoxy vitrimer containing AFD 30 wt%. The self-healable epoxy vitrimer could be applied for smart applications such as coating.
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