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Preparation of dual-chamber microcapsule by Pickering emulsion for self-healing application with ultra-high healing efficiency.

Abstract：

:This work presented a new concept for designing dual-chamber self-healing microcapsules, which encapsulated both healing and curing species within a single microcapsule via Pickering emulsion photopolymerization. In our strategy, robust SiO2 spheres encapsulating curing agent were firstly synthesized and used as Pickering emulsifiers to prepare emulsions loaded with self-healing agent and photo-curable monomer. Upon exposure to UV light, the photo-curable monomer underwent photo-crosslinking and converted into microcapsules wall. In the meanwhile, the SiO2 spheres encapsulating curing agent were trapped in the microcapsule wall. The dual-chamber microcapsule which loaded the healing agent in its core and curing agent within its shell, was thus prepared. The presence of both the encapsulated healing and curing agent within a single capsule was demonstrated by infrared spectrometry and thermogravimetric analysis. Upon fracture, the healing agent and curing agent are released simultaneously from the dual-chamber microcapsule, which facilitates the interaction of the two agents, and enhances the healing efficiency. Up to 85% healing efficiency of the epoxy resin was achieved in 1 h, which was much higher than that of the traditional double microcapsules self-healing system (65%), demonstrating the excellent self-healing performance of the dual-chamber microcapsules. It has been demonstrated that the coating based on dual-chamber microcapsule presented reliable and outstanding self-healing anti-corrosion efficiency. By changing the species of healing agent, curing agent and wall substances (photo-curable monomer), the as-prepared dual-chamber microcapsules can meet different requirements of versatile self-healing system.

journal_name

J Colloid Interface Sci

journal_title

Journal of colloid and interface science

authors

Wu K,Chen Y,Luo J,Liu R,Sun G,Liu X

doi

10.1016/j.jcis.2021.05.066

keywords:

["Dual-chamber microcapsule","Pickering emulsion","Self-healing"]

subject

Has Abstract

pub_date

2021-10-15 00:00:00

pages

660-669

eissn

0021-9797

issn

1095-7103

pii

S0021-9797(21)00739-6

journal_volume

600

pub_type

杂志文章

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Preparation of dual-chamber microcapsule by Pickering emulsion for self-healing application with ultra-high healing efficiency.