胆固醇液晶热致变色微胶囊的制备及其性能

Preparation and properties of thermotropic cholesterol liquid crystal microcapsules

为探索胆固醇类液晶在热致变色纺织品制备中的应用,采用三羟甲基三聚氰胺为壁材,胆固醇油醇碳酸酯和胆固醇壬酸酯的混合物为芯材,利用原位聚合法制备了胆固醇液晶微胶囊。对制备得到液晶微胶囊的微观形貌特征、热学性能以及热致变色性能进行了测试。测试结果表明:在乳化速度为6 000 r/min、芯壁质量比为3∶2、微胶囊包覆时反应溶液p H值为4.0的条件下,制备的液晶微胶囊粒径分布在10μm左右,微胶囊具有致密的壳结构、表面光滑的球形形态,以及良好的热致变色性能;它可在34.4~38.0℃的温度区间内,依次显示红黄绿蓝紫的颜色变化;其变色温度与人体体温接近,适合用于热致变色织物的制备。

In order to explore cholesterol liquid crystal in the application of thermotropic textiles, microeapsules were prepared from melamine-formaldehyde as wall material and cholesteryl oleyl carbonate and cholesterol pelargonate mixture as core material by in-situ polymerization. The micro morphology, thermal properties and optical properties of the liquid crystal microcapsules were tested. The results show that when the emulsion speed is 6 000 r/min, the mass ratio of core to wall is 3： 2, and the pH value of the reaction solution is 4.0. The microcapsules have compact shell, spherical shape and smooth surface, particle size about 10 p.m, and good thermotropic properties. When the temperature raises from 34.4 ℃ to 38 ℃ , their color shows red, yellow, green, blue and purple in turn. The color change temperature is close to human body temperature. It is suitable for the manufacture of thermotropic textiles.