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Self Healing Materials for Low Temperature Applications

Mohammad Asgar-Khan, Suong Van Hoa

Abstract


This work investigates the feasibility of structural self-healing of Fiber reinforced Polymer Composites (FRPC) using microencapsulated monomer/catalyst system for low temperature applications. Microcapsule containing liquid 5E2N monomer in poly melamine urea formaldehyde (PMUF) shells have been synthesized following the insitu emulsion polymerization technique. Free flowing microcapsules of average size ranging from 200 μm down to 20 μm have been successfully produced. Healing agents (catalyst particles and microcapsules) are dispersed into the resin using vacuum centrifugation technique. Feasibility of self-healing of cracks in cured resin samples containing the healing agents is demonstrated by visually observing the flow of monomer filling and healing the cracks. Methods are developed to evaluate the quality of self-healing in FRPC samples containing initial mid layer flaw. Healing agents dispersed in resin are applied between the mid layers of dry carbon fabric to manufacture FRPC laminate using hand lay-up method in autoclave. The load-unloadheal- load steps within the ASTM test protocol has been employed to study the healing effects of FRPC. Composite samples containing different average sizes and weight percentage of microcapsules are tested to understand their effect on self-healing performance. Test results are compared between no healing (without healing agents) and healing (with healing agents) specimens.

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