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Synthesis of Diels‐Alder Reaction‐Based Remendable Epoxy Matrix and Corresponding Self‐healing Efficiency to Fibrous Composites
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-08-11 , DOI: 10.1002/mame.202000359
Pan Wu 1 , Ling Liu 1 , Zhanjun Wu 2
Affiliation  

A Diels‐Alder (DA) thermo‐reversible compound consisting of a furan (FA) and a bismaleimide (BMI) is synthesized and grafted to a general low‐viscosity epoxy to prepare a self‐healable epoxy matrix system. Results prove that the synthesized epoxy can completely self‐heal its own cracks and the interlaminar shear cracks of a fiber reinforced plastic (FRP) due to the dissociation and reassociation of DA thermo‐reversible covalent bonds under proper thermal excitations. Self‐healing efficiencies of 108.5% for the first healing and 130.5% for the second healing are obtained to the mode II interlaminar fracture toughness (GIIC) of the FRP. Moreover, the obtained first and second healing efficiencies of interlaminar shear strength (ILSS) can also reach 105.8 and 102.4%, respectively. Most importantly, the obtained original mechanical properties, with GIIC of 0.82 kJ m−2 and ILSS of 41.6 MPa, of the FRP are much closer to those of traditional structural FRPs. Therefore, this study reveals that the synthesized epoxy system can be used to prepare structural FRPs possessing high self‐healing capability.

中文翻译:

基于Diels-Alder反应的可调节环氧基质的合成及其对纤维复合材料的自愈效率

合成了由呋喃(FA)和双马来酰亚胺(BMI)组成的Diels-Alder(DA)热可逆化合物,并将其接枝到一般的低粘度环氧树脂上,以制备可自我修复的环氧基质体系。结果证明,在适当的热激发下,由于DA热可逆共价键的解离和重新结合,合成的环氧树脂可以完全自我修复其自身的裂纹和纤维增强塑料(FRP)的层间剪切裂纹。II型层间断裂韧度(G IIC)的第一次愈合的自愈效率为108.5%,第二次愈合为130.5%)。而且,获得的层间剪切强度(ILSS)的第一和第二愈合效率也分别可以达到105.8%和102.4%。最重要的是,FRP的原始机械性能(G IIC为0.82 kJ m -2,ILSS为41.6 MPa)与传统结构FRP更加接近。因此,本研究表明合成的环氧体系可用于制备具有高自修复能力的结构玻璃钢。
更新日期:2020-10-12
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