Preparation and development of functional microcapsules consisting of porous polymer as shell material

点击翻译按钮获取中文摘要

(1)Preparation and development of extraction microcapsules The functional microcapsules extracting propionic acid in aqueous solution were prepared by in situ polymerization processing under the condition of monomer concentration = 1.85 - 3.55M,, divinylbenzene/styrene ratio = 0.1 - 0.4 and stirring speed = 400 - 1200rpm. Core solution is n-dodecane of tri-n-octyl amine.The microcapsules containing tri-n-octyl amine effectively extracted propionic acid in aqueous solution. Furthermore, extraction equilibria in the microcapsule system agreed with the results in the liquid-liquid system. The rate-determining step was the pore diffusion through the porous membrane of microcapsules. The extraction rate was variable by changing monomer concentration, divinylbenzene/styrene ratio and average diameter of microcapsules.(2)Preparation and development of microcapsule tonerThe research has been carried out to clarify the following two points. The first is that microcapsule toner having monodispersed diameter is prepared by SPG membrane emulsification method. The last is that leakage of core solution through microcapsule membrane is prevent by the formation of interfacial polymerization membrane after in situ polymerization. As the results of the study mentioned above, monodispersed microcapsule toner which diameter is 5 to 10mum could be prepared by SPG membrane emulsification method. Microcapsule toner having double membrane by interfacial polymerization and in situ polymerization is seemed to prevent the leakage of core solution. Moreover, it is clarified that polyamide membrane by interfacial polymerization is better electrostatic capacity than polyester membrane by interfacial polymerization.