溶剂挥发法制备高密封性光致变色微胶囊

Preparation of high sealing photochromic microcapsules via solvent evaporation method

摘要:

通过溶剂挥发法制备了以聚甲基丙烯酸甲酯为壳材、螺吡喃类光致变色染料为芯材的光致变色微胶囊。采用FTIR、SEM、粒径分析仪、分光光度计、测色配色仪对微胶囊的微观形貌、粒径和颜色等进行了表征。结果表明芯壁质量比(芯/壁)对微胶囊的形貌和性能有着显著的影响，当芯壁质量比为2:1时，微胶囊具有良好的颜色性能，变色前后色差为△ECMC大于20，并且包覆严密、表面光滑。当芯壁质量比大于2:1时，微胶囊不能很好的包覆。光致变色微胶囊照射到紫外光就会立即变色，完全变色时间为16s，在紫外光-可见光30个循环后，仍具有优异的光致变色灵敏性。

Abstract:

Photochromic microcapsules with polymethyl methacrylate as the shell material and spiropyran photochromic dyes as the core material were prepared by solvent evaporation method. FTIR, SEM, particle size analyzer, spectrophotometer, and colorimeter were used to characterize the micro-morphology, particle size, and color of the microcapsules. The results show that the core-shell mass ratio (core / shell) has a significant effect on the morphology and performance of the microcapsules. When the core-shell mass ratio is 2: 1, the microcapsules have good color performance, and the △ECMC before and after color change is 20, and the microcapsules have a strict surface and a smooth surface. When the core shell mass ratio is larger than 2: 1, the microcapsules cannot be coated well. The photochromic microcapsules immediately change color when exposed to ultraviolet light, and the complete discoloration time is 16s. After 30 cycles of UV-visible light, it still present excellent photochromic sensitivity.