Abstract: Towards the self-healing of polymer material，chooses dicyclopentadiene（DCPD）as core，adopts melamine-urea-formaldehyderesin as wall meterial，to fabricate the microcapsules. The properties of microcapsules，including the particle size，the surface morphology，the thermal properties and the chemical structure，are analysed by using laser particle size analyzer，optical-photographic microscope（OM），microcomputer differential thermal balance and Fourier transform infrared spectroscopy（FT-IR），respectively. Meanwhile，the effects of the feed capacity of core material，emulsifier content and emulsifying speed on the preparation of microcapsules are discussed. Experimental results indicate that the highest core content of the resultant microcapsules is about 90wt.% and the average diameter in volume of the microcapsules is in the range of 50～70 μm，which can be adjusted by changing processing parameters.

Key words: self-healing, dicyclopentadiene（DCPD）, microcapsule, melamine-urea-formaldehyderesin