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Preparation and performance of self-healing epoxy resin matrix composites using microcapsules |
School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The self-healing epoxy resin microcapsules were synthesized by in-situ polymerization with urea-formaldehyde resin as shell material and E-51 epoxy resin as core material. The morphology of microcapsules was observed by scanning electron microscope(SEM), and the size and distribution were measured by metallurgical microscopy. The chemical structure of microcapsules was characterized by Fourier transform infrared spectroscope(FTIR), and the thermal degradation characteristics were determined by thermogravimeter (TGA). Microencapsulated E-51 epoxy resin healing agent and phthalic anhydride latent curing agent were embedded into E-44 epoxy matrix to prepare self-healing epoxy composites. The impact strength and the self-healing efficiency of composites were measured by Charpy impact tester. The results show that the microcapsules are uniform sphere with high core content and good thermal stability. The fracture of pure epoxy shows brittle performance with mirror fracture surface, while the fracture of composites with microcapsules exhibits hackle marking. In the case of 8.0% microcapsules and 3.0% latent hardener, the optimum self-healing efficiency reaches 81.5%.
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Received: 17 October 2016
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