Synthesis of Diels‐Alder Reaction‐Based Remendable Epoxy Matrix and Corresponding Self‐healing Efficiency to Fibrous Composites
Synthesis of Diels‐Alder Reaction‐Based Remendable Epoxy Matrix and Corresponding Self‐healing Efficiency to Fibrous Composites
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DOI：
10.1002/mame.202000359
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
Pan Wu;Ling-Ling Liu-Ling;Zhanjun Wu
中科院分区：
文献类型：
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作者：
Pan Wu;Ling-Ling Liu-Ling;Zhanjun Wu
合成了由呋喃（FA）和双马来酰亚胺（BMI）组成的Diels-桤木（DA）热可逆化合物，并将其接枝到普通低粘度环氧树脂上，以制备自愈合环氧树脂基体体系。结果表明，在适当的热激励下，由于DA热可逆共价键的离解和再缔合，合成的环氧树脂能够完全自愈合其自身的裂纹和纤维增强塑料（FRP）的层间剪切裂纹。对于FRP的II型层间断裂韧性（GIIC），第一次愈合的自愈效率为108.5%，第二次愈合的自愈效率为130.5%。此外，获得的层间剪切强度（ILSS）的第一和第二愈合效率也可以分别达到105.8%和102.4%。最重要的是，获得的原始力学性能，GIIC为0.82 kJ m− 2和ILSS为41.6 MPa，FRP更接近传统结构FRP。因此，本研究表明，合成的环氧树脂体系可用于制备具有高自修复能力的结构FRP。
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, withGIICof 0.82 kJ m−2and 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.