Abstract
Up to now, very few papers already published for the discussion of the relation between operational conditions and the characteristics of produced capsules systematically. The microencapsulation mechanism of in-situ polymerization method also has not been investigated in detail. In this paper, the encapsulation by in-situ polymerization method was focused, and respective effects of operating factors in the encapsulation process on the microcapsules with solid and liquid core were investigated systematically to understand the encapsulation mechanism. Silica particles with narrow size distribution and mono-dispersed kerosene droplets prepared by SPG membrane emulsification method were used as solid and liquid cores, respectively in order to prevent the complicated effect of core size distribution on microencapsulation. They were microencapsulated by in-situ polymerization method under various operating conditions where polymerization temperature, core size, stirring rate and addition time of core material were changed, and the membrane growth and the surface of microcapsules were examined. The relations between the membrane thickness and the circularity of formed capsules and each operational factors were discussed. The microcapsules obtained on solid and liquid cores were also compared.
