以甲基丙烯酸甲酯、丙烯酸正丁酯、丙烯酸等为单体,二丙烯酸-1,6-己二醇酯为交联剂,采用自乳化法制备了丙烯酸酯乳液。乳液的平均粒径为249 nm,具有较好的单分散性。用该乳液对自制的光致变色材料螺吡喃进行包裹,获得了光致变色微球。在常温下,采用紫外-可见光谱对光致变色微球的变色性质及抗疲劳性进行了检测,并通过建立半数吸光度可逆变色循环次数参数Z50,将包裹了螺吡喃的微球与未包裹的螺吡喃溶液进行对比,发现包裹后的微球除了具备良好的光致变色性质外,其抗疲劳性亦远高于其溶液。
An acrylic emulsion was prepared by methyl methacrylate (MMA),butyl acrylate (BA),acrylic acid (AA)and 1 ,6-hexanedioldiacrylate(HDDA)via self-emulsifying process.The emulsion paticles had an average diameter of 249 nm and showed narrow polydispersity.The photochromic particles were prepared by doping photo-responsive spiropyran into the emulsion.The photochromism and fatigue resistance of the particles were determined by UV-Vis spectrum at ambient temperature.Owning to the parameter Z50 ,which was the number of cycles required to reduce the initial absorbance atλmax by 50%,the fatigue resistance of spiropyran was deter-mined quantitatively.According to the results,the Z50 of the particles was much higher than that of the solu-tion.It demonstrated that the spiroyran particles had excellent fatigue resistance as well as photochromism.
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