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Preparation of dual-chamber microcapsule by Pickering emulsion for self-healing application with ultra-high healing efficiency
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2021-05-18 , DOI: 10.1016/j.jcis.2021.05.066
Kaiyun Wu 1 , Yaxin Chen 1 , Jing Luo 1 , Ren Liu 1 , Guanqing Sun 1 , Xiaoya Liu 1
Affiliation  

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.



中文翻译:

皮克林乳液自愈应用制备双室微胶囊,具有超高的愈合效率

这项工作提出了一种设计双腔自愈微胶囊的新概念,该微胶囊通过Pickering乳液光聚合作用将愈合和固化物种封装在单个微胶囊中。在我们的策略中,首先合成了坚固的SiO 2球形封装固化剂,并将其用作Pickering乳化剂来制备载有自修复剂和光固化单体的乳液。在暴露于紫外线下,光固化单体进行光交联并转化为微胶囊壁。同时,SiO 2封装固化剂的球被捕获在微囊壁中。由此制备了在其芯中装载了治疗剂并且在其壳中装载了固化剂的双室微胶囊。通过红外光谱法和热重分析法证明了单个胶囊中包封的愈合剂和固化剂的存在。骨折时,愈合剂和固化剂同时从双腔微囊中释放出来,这促进了两种试剂的相互作用,并提高了愈合效率。环氧树脂在1 h内达到高达85%的愈合效率,远高于传统的双微胶囊自愈系统(65%),证明了双腔微胶囊的优异自愈性能。已经证明,基于双室微胶囊的涂层表现出可靠且优异的自修复防腐性能。通过改变固化剂,固化剂和壁物质(光固化单体)的种类,所制备的双室微胶囊可满足多功能自愈系统的不同要求。

更新日期:2021-05-25
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