液晶微囊化制备及光学性能的研究

Preparation of Liquid Crystal Microencapsulation and the Optical Properties

为解决液晶分子在应用时封装复杂、难以成膜的问题,采用复凝聚法,利用液晶为囊芯材料,阿拉伯胶与明胶为璧材,对向列液晶5CB进行了微囊化.分析了溶液pH值、反应温度、反应时间、壁材浓度、搅拌速率等因素对微胶囊产品质量的影响.通过偏光显微镜和紫外分光光度计对形貌及包囊情况进行表征.研究结果表明：制备液晶微胶囊的最佳工艺条件为明胶与阿拉伯胶浓度均为2%,且两者质量比为1：1,pH值为4.0,搅拌速度为1 500r·min^-1,反应温度为55℃,凝聚时间为15-20min,固化温度为10℃,固化时间60min.

In order to solve the complexity of liquid crystal molecules package and the difficulty of filming in applications,the co-acervation method is used in the liquid crystal microencapsulation where liquid crystal is used as core material,arabia glue and gelatin are used as wall materials,the nematic liquid crystal 5CB is microencapsulated.The pH value of solution,reaction temperature,reaction time, concentration,stirring rate are investigated.The morphology and encapsulation effects are characterized by POM and UV.The results show that the optimal conditions of liquid crystal microencapsulation are as follewing：concentration of arabia gelatin or gum of 2%,mass ratio of gelatin and gum arabia of 1：1, pH of 4.0,stirring speed of 1 500 r·min^-1 ,reaction temperature of 55 ℃,solidifying temperature of 10℃ and solidifying time of 60 min.