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Novel Repeated Self-Healing Epoxy Composite with Alginate Multicore Microcapsules

Abstract

Epoxy (diglycidyl ether of bisphenol A) and hardener (mercaptan/tertiary amine) are encapsulated within alginate biopolymer to form self-healing multicore microcapsules. Electrospraying method produces dry microcapsules with diameter in the range of (300 – 400 µm), associated with core content of 74 % and 59 % for epoxy and hardener microcapsules, respectively. Both microcapsules are equipped with rough surface and multicore internal structures. The shell wall of both microcapsules varies around 3 – 6 µm. Thermogravimetric analysis (TGA) showed that these microcapsules can withstand up to 200 °C. Two types of self-healing system are fabricated, dual-capsule and capsule-catalyst self-healing systems where Scandium (III) triflate is used as the catalyst. Both self-healing systems are assessed through Charpy impact test. Healing is initiated at capsule loading of 20 wt% and above for both healing systems. Dual-capsule self-healing system shows up to 4 healing cycles with the healing efficiency in the range of 68 – 85 %. Furthermore, capsule-catalyst self-healing system achieves 2 – 3 healing cycle with the healing efficiency in the range of 66 - 89 %. The multiple healing is contributed by the capsules multicore internal structure which can control the release of healing agents. For the first time, we show that alginate self-healing multicore microcapsules are able to provide multiple healing cycles to capsule-based self-healing composites.

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Publication details

The article was received on 23 Feb 2018, accepted on 02 Apr 2018 and first published on 03 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01783B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Novel Repeated Self-Healing Epoxy Composite with Alginate Multicore Microcapsules

    I. L. Hia, E. S. Chan, S. Chai and P. Pasbakhsh, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01783B

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