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以表面含乙烯基团、粒径约250nm的二氧化硅为模板,甲基丙烯酸-6-(4-甲氧基-4′-氧-偶氮苯)己酯(Azo-M)为共聚单体,二乙烯基苯(DVB)为交联剂,通过蒸馏沉淀聚合方法制备了以二氧化硅为核、聚偶氮苯为壳的杂化粒子(PAzo@SiO2).通过氢氟酸溶液刻蚀法制备聚偶氮苯(PAzo)中空微球.采用透射电子显微镜、傅里叶红外光谱表征了其结构,采用热失重分析、UV-vis光谱表征其热稳定性和光异构化行为.结果表明:当DVB为Azo-M的20%、乙腈为200mL、聚合时间为4.5h,得到了孔径约250nm、壳层厚度约20nm的中空微球.这种聚偶氮苯中空微球具有优异的热稳定性和可逆的光响应性,其光响应速率比偶氮苯均聚物(Homo-PAzo)仅降低了11.8%.
Using silica with a vinyl group on the surface and a particle diameter of about 250 nm as a template, hexylmethacrylate (Azo-M) was copolymerized (PAzo @ SiO2) with silica as the core and poly (azobenzene) as the shell were prepared by the method of distillation-precipitation polymerization using DVB and DVB as the cross-linking agent. (PAzo) hollow microspheres were prepared by the eutectic method.The structure of the hollow microspheres was characterized by transmission electron microscopy and Fourier transform infrared spectroscopy, and their thermal stability and photoisomerization behavior were characterized by thermogravimetric analysis and UV-vis spectroscopy. It shows that when DVB is 20% of Azo-M, acetonitrile is 200mL and polymerization time is 4.5h, hollow microspheres with a pore size of about 250nm and a shell thickness of about 20nm are obtained.The polyazobenzene hollow microspheres have excellent Thermal stability and reversible light responsiveness, the light response rate is only 11.8% lower than that of Homo-PAzo.