Two types of microcapsules were prepared by in situ polymerization with poly(urea-formaldehyde) (PUF) as the shell material. The core materials of the microcapsules contained Sylgard 184A gum (labeled as capsule I) and hydrogen silicone oil (labeled as capsule II). Capsule types I and II were characterized by optical microscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Capsule types I and II were incorporated into silicone rubber polydimethylsiloxane (PDMS) at an appropriate proportion to construct a self-healing system. The healing efficiency initially increases and then decreases with the increased proportion and addition of the two capsules. The maximum self-healing efficiency is obtained with a value of 70.5% by the incorporation of 10 wt% miscellaneous microcapsules when the weight proportion of capsule types II and I is 0.6. Cracks in the PDMS/capsule composites almost disappear with an increased healing time of up to 24 h at room temperature, indicating improved healing properties with a prolonged healing time.

中文翻译：

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使用双胶囊室温愈合系统改善聚二甲基硅氧烷弹性体的自愈合性能和抗裂纹扩展性

以聚脲甲醛（PUF）为壳材料，通过原位聚合制备了两种类型的微胶囊。微胶囊的核心材料包含Sylgard 184A胶（标记为胶囊I）和氢硅油（标记为胶囊II）。I 型和 II 型胶囊通过光学显微镜、傅里叶变换红外 (FTIR) 光谱、扫描电子显微镜 (SEM) 和热重分析 (TGA) 进行表征。胶囊类型 I 和 II 以适当的比例掺入硅橡胶聚二甲基硅氧烷 (PDMS) 中，以构建自愈系统。愈合效率随着两种胶囊的比例和添加量的增加而先升高后降低。值为 70 时获得最大自愈效率。当II型和I型胶囊的重量比例为0.6时，通过掺入10wt%的杂微胶囊而得到5%。PDMS/胶囊复合材料中的裂缝在室温下随着愈合时间的增加而几乎消失，最长可达 24 小时，表明愈合时间延长后愈合性能得到改善。