溶剂挥发法制备聚苯乙烯壳材光致变色微胶囊

Preparation of polystyrene shell photochromic microcapsules by solvent evaporation

摘要:

针对螺吡喃有机光致变色材料在实际应用中的耐疲劳性差的问题，以螺吡喃光致变色材料作为芯材，聚苯乙烯为壳材，采用溶剂挥发法制备了螺吡喃光致变色微胶囊，并将制得的光致变色微胶囊印花在织物上得到光致变色织物。结果表明，微胶囊包覆完整，表面光滑，粒径分析仪测得的平均粒径达到700 nm，粒径分布比较分散。光致变色微胶囊具有良好的变色性能，在紫外光照射下20s即可完全变色，黑暗环境下8min能够恢复至初始状态，光致变色微胶囊的印花织物变色前后的色差ΔECMC达到36.10，且在经过20次紫外线-可见光照射循环后仍具有良好的变色灵敏性。因此，制得的光致变色微胶囊在智能纺织材料等领域有良好的应用潜力。

Abstract:

In order to solve the problem of poor fatigue resistance of spiropyran organic photochromic material in practical application, the spiropyran photochromic material is used as the core material and polystyrene as the shell material to prepare spiropyran photochromic microcapsule by solvent evaporation method. And the photochromic microcapsules are printed on the fabric to obtain the photochromic fabric. The results show that the microcapsules are completely coated, the surface is smooth, the average particle size measured by the particle size analyzer reaches 700 nm, and the particle size distribution is relatively dispersed. The photochromic microcapsules have good discoloration performance. It can change from white to purple in 20 s under ultraviolet light irradiation, and can return to the initial state in 8 minutes in a dark environment. The color difference ΔECMC of the printed fabrics with photochromic microcapsules before and after discoloration reaches 36.10, and it still has good discoloration sensitivity after 20 cycles of UV-visible light irradiation. Therefore, the obtained photochromic microcapsules have good application potential in fields such as smart textile materials.