悬浮聚合法制备螺吡喃@聚甲基丙烯酸甲酯光变微胶囊

Preparation of spiro-pyran@poly(methyl methacrylate)photochromic microcapsules by suspension polymerization

采用悬浮聚合法制备以聚甲基丙烯酸甲酯(PMMA)为壳材,包覆光变材料螺吡喃的光变微胶囊。通过对不同的实验因素如分散剂、搅拌速率以及芯壁比等条件的分析,探寻最佳的实验工艺,同时对制备的光变微胶囊的结构以及变色性能和耐疲劳性等进行分析。结果表明,投入芯材与壳材的质量比为1∶1,以苯乙烯-马来酸酐共聚物与一定量的明胶进行复配作为分散稳定剂,搅拌速度控制在650 r/min所制备的光变微胶囊最佳。光变微胶囊形状规则呈球形,大小均匀,平均粒径在2~3μm,包覆率可以达到88.1%,在紫外光的照射下具有良好的变色性能、光变响应速率以及耐疲劳性。

The optimal experimental process for the preparation of photochromic microcapsules using PMMA as the shell material and spiro-pyran as the coating material was investigated to achieve excellent coating of photochromic materials and improve their photochromic properties.The results showed that the photochromic microcapsules were successfully prepared by suspension polymerization method,and the best experimental conditions for the preparation of photochromic microcapsules were determined by analyzing different experimental factors such as dispersant,stirring rate,core-to-wall ratio,etc.styrene-maleic anhydride copolymer was compounded with a certain amount of gelatin as dispersant stabilizer,the mass ratio of input core material to shell material was controlled as 1∶1,the stirring speed was controlled as 650 r/min,and the photochromic microcapsules were prepared by using the following conditions.The prepared photochromic microcapsules were spherical in shape and uniform in size,with an average particle size of 2-3μm.The photochromic microcapsules had good color change performance,photochromic response rate and fatigue resistance under UV irradiation.