Preparation and Performance of Self-Healing Epoxy Composites by Microcapsulated Approach

Abstract:

Microencapsulated E-51 epoxy resin healing agent and phthalic anhydride latent curing agent were incorporated into E-44 epoxy matrix to prepare self-healing epoxy composites. When cracks were initiated or propagated in the composites, the microcapsules would be damaged and the healing agent released. As a result, the crack plane was healed through curing reaction of the released epoxy latent curing agent. In the paper, PUF/E-51 microcapsules were prepared by in-situ polymerization. The mechanical properties of the epoxy composites filled with the self-healing system were evaluated. The impact strength and self-healing efficiency of the composites are measured using a Charpy Impact Tester. Both the virgin and healed impact strength depends strongly on the concentration of microcapsules added into the epoxy matrix. Fracture of the neat epoxy is brittle, exhibiting a mirror fracture surface. Addition of PUF/E-51 microcapsules decreases the impact strength and induces a change in the fracture plane morphology to hackle markings. In the case of 8.0 wt% microcapsules and 3.0 wt% latent hardener, the self-healing epoxy exhibited 81.5% recovery of its original fracture toughness.

• Periodical: Key Engineering Materials (Volume 636)
• Pages: 73-77
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.636.73
• Online since: December 2014
• Authors: Xin Hua Yuan*, Qiu Su, Li Yin Han, Qian Zhang, Yan Qiu Chen, Yong Qiang Liu, Tian Tian Liu, Lei Gao
• Keywords: Epoxy Composites, Microcapsules, Self-Healing, Self-Healing Efficiency

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