Controllable preparation of isophorone diisocyanate microcapsules with silica/polyurea hybrid shells and application in self-healing epoxy coatings

聚脲 异佛尔酮二异氰酸酯 材料科学 热稳定性 复合材料 环氧树脂 界面聚合 傅里叶变换红外光谱 聚合 扫描电子显微镜 聚氨酯 化学工程 聚合物 单体 工程类
作者
Xudong Li,Xiaoyun Li,Yuhua Zhao,Qifeng Li,Junwei Wang,Maoqing Kang
出处
期刊:Progress in Organic Coatings [Elsevier BV]
卷期号:163: 106638-106638 被引量:16
标识
DOI:10.1016/j.porgcoat.2021.106638
摘要

Isophorone diisocyanate (IPDI) microcapsules with silica/polyurea hybrid shells were successfully synthesized via interfacial polymerization and in situ polymerization in an oil/water emulsification system. The micromorphology and surface silicon species-modified microcapsules were studied by scanning electron microscopy and X-ray photoelectron spectroscopy. The components of the microcapsules were analysed by Fourier transform infrared spectroscopy. The resultant microcapsules have diameters of 76.5 ± 16.5 μm, shell thicknesses of approximately 2.3 μm, and core fractions of 76.5 wt%. Meanwhile, the thermal stability, storage stability and solvent resistance of the microcapsules were evaluated. The results showed that silica/polyurea microcapsules had excellent thermal stability with the initial decomposition temperature, increasing by approximately 92 °C compared with that of polyurea microcapsules. More than 65.0 wt% active core fraction of silica-modified microcapsules was reserved after six months in air or 40 days in water. The microcapsules were incorporated into epoxy resin coatings. The scratch and self-healing test of the coatings proved that the silica-modified microcapsules healed the scratch successfully.
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