Preparation and Properties of Self-Healing Microcapsules

Self-healing microcapsules were synthesized by in-situ polymerization with urea-formaldehyde resin as shell material and dicyclopentadiene as core material,respectively.The encapsulation process of microcapsules was observed by using optical microscopy.The effect of different emulsifiers on the morphology of microcapsules was studied by SEM.The chemical structure and particle size distribution of microcapsules were analyzed by FT-IR and laser particle size analyzer.The effects of different emulsifier concentrations and emulsifying rotation speed on the particle size distribution of microcapsules were investigated.The effects of different concentrations of NaCl solution on encapsulation ratio of microcapsules were discussed as well.The experimental results show that microcapsules were prepared with smooth surface by adding DBS of 5.0% as emulsifier with the rotation speed of 6000 r·min-1.Encapsulation ratio of microcapsules can be increased from 73.0% to 89.2% by adding 4.0% NaCl solution.