Abstract:

Urea-formaldehyde microcapsule was produced by means of one step in-site polymerization.Optical microscope, scanning electron microscope and laser scanning confocal microscope (fluorescence tagged microcapsule shell) were used to analyze the size, shell thickness and structure of the microcapsule.The mechanical properties of the microcapsule was tested and analyzed by nano indentation test.The results showed that the dispersed and integrated microcapsules of 100 μm in diameter and 10 μm in shell thickness were produced with 45% core content.Young’s modulus of the microcapsule was a little lower than that of epoxy resin.When damage occurred in the epoxy resin matrix, the crack could rupture the microcapsule and release the repairing agent.

Key words:

微胶囊, 自修复, 微纳力学性能

摘要： 采用一步原位聚合法制备了自修复微胶囊。应用光学显微镜、扫描电子显微镜和激光共聚焦显微镜对微胶囊壁厚、微结构进行了分析和表征。借助纳米探针对微胶囊及其壳材进行压痕实验测试其力学性能。结果表明，自修复微胶囊包裹完整，表面粗糙，微胶囊平均粒径为100μm，平均壁厚为10μm，微胶囊修复剂芯材含量约为75%；纳米压痕分析显示微胶囊的弹性模量比环氧树脂的略小，说明了当环氧树脂基体内裂纹扩展时，裂纹更易于向微胶囊扩展，证明了环氧树脂微裂纹打开微胶囊释放修复剂的可行性。

关键词:

微胶囊, 自修复, 微纳力学性能