Abstract: Low temperature reversible thermochromic microencapsules were prepared by interfacial polymerization method with CoCl2 as the capsule core and poly(vinyl alcohol) as wall material. The effects of emulsifier dosage, water-oil ratio, stirring speed and adding method of inner emulsion on the particle size of microcapsules were investigated. The structure and surface morphology of microcapsules were characterized by FT-IR, polarization microscope and SEM, respectively. The results show that the uniform particle size and good dispersion of microcapsules at average 12 mm in diameter are obtained with the mass fraction of 5% emulsifier (Span-80 and Tween-80) dosage, volume ratio of water to oil 0.2, stirring speed 1200 r/min and gradual dropwise addition method.

Key words: microcapsule, reversible thermochromism, particle size, interfacial polymerization

摘要： 采用界面聚合法制备了以CoCl2为芯材、聚乙烯醇为壁材的可逆热敏示温微胶囊，系统研究了乳化剂用量、内水相与油相用量比、搅拌速度、内乳液加入方式对微胶囊粒径的影响，并对微胶囊的结构和形貌进行了表征. 结果表明，当Span-80/Tween-80含量为5%(w)、水油体积比为0.2、转速为1200 r/min、内乳液采用逐步滴加方式加入外水相中时，制备的微胶囊粒径均一，平均粒径为12 mm，分散性好.

关键词: 微胶囊, 可逆热敏示温, 粒径, 界面聚合