环氧树脂微胶囊与潜伏性固化剂自修复体系断裂韧性的研究

STUDY ON FRACTURE TOUGHNESS OF SELF-HEALING POLYMERIC MATERIALS WITH EPOXY-CONTAINING MICROCAPSULES AND LATENT CURING AGENT

微胶囊二元自修复系统对聚合物基复合材料在使用中产生的微小裂纹具有修复作用,但微胶囊和固化剂的加入会对基体材料的断裂韧性产生影响。本文研究了环氧树脂微胶囊和咪唑类潜伏性固化剂对聚合物基复合材料基体材料的断裂韧性的影响。采用环氧树脂E-51作为基体材料,三乙烯四胺为常温固化剂,咪唑类衍生物2MZ-Azine和实验室自制的包含环氧树脂芯材的微胶囊为材料制作断裂韧性拉伸试样。实验结果表明,当微胶囊的含量达到一定比例之前,基体材料的断裂韧性随着微胶囊含量的增加而增强,当微胶囊含量超过此比例后,基体材料的断裂韧性随着微胶囊含量的增加而减小,潜伏性固化剂的加入会增大基体材料的断裂韧性。这与环氧树脂材料增韧理论相符合。

Self-healing polymeric materials have attracted more and more attention because of their advanced application in the field of astronautics and aviation. Microcracks generated during the use of polymer-based composites can be repaired by binary self-healing system consisting of mierocapsules and latent hardener. But microcapsules and latent hardener in the matrix greatly influence on the fracture toughness of substrate material. The effect of weight ratio of microcapsules and latent hardener on the fracture toughness of composite was investigated in this paper. Tensile samples were fabricated using epoxy resin as substrate material, using triethylenetetramine as room temperature curing agent, and using imidazoline derivatives latent hardener and epoxy-containing microcapsules as materials. The results shows that fracture toughness enhances with the increase of weight ratio in a range of certain proportion. However, the fracture toughness of composite will reduce while the content of microcapsules continues increasing. Moreover, the fracture toughness increases with the enhancement of weight ratio of latent hardener. This conforms to the toughening theory of the epoxy resin.