Self-healing in polymers and polymer composites
To provide epoxy based composites with self-healing ability, two-component healing system consisting of urea-formaldehyde walled microcapsules containing epoxy (30-701am in diameter) and CuBr2(2-Melm)4 (the complex of CuBr2 and 2-methylimidazole) latent hardener was synthesized.When cracks were initiated or propagated in the composites, the neighbor micro-encapsulated epoxy would be damaged and released. As the latent hardener is soluble in epoxy, it can be well dispersed in epoxy composites during composites manufacturing, and hence activate the released epoxy wherever it is. As a result, repair of the cracked sites is completed through curing of the released epoxy. The present work studied the preparation of epoxy loaded microcapsules by amino resins and the influencing factors. Then, mechanical properties of the epoxy filled with the healing system were evaluated. It was found that incorporation of the two-component healing system nearly did not change the fracture toughness of the neat epoxy. In the case of 10wt％ microcapsules and 2wt％ latent hardener, the self-healing epoxy exhibited a 111％ recovery of its original fracture toughness. Besides, the results of double-cantilever beam testing showed that the plain weave glass fabric laminates using the above self-healing epoxy as the matrix can also be provided with self-healing capability.
Ming Qiu Zhang
Materials Science Institute,Zhongshan University,Guangzhou 510275,China
国际会议
5th International Symposium on High-Tech Polymer Materials(HTPM-V)(第五届国际高技术高分子材料学术会议)
北京
英文
30
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）