Synthesis and photo-responsive behaviors of hollow polyazobenzene micro-spheres  

作　　者：WANG XiaoTao YANG YingKui YANG ZhiFang LIAO YongGui ZHANG Wei XIE XiaoLin 

机构地区：[1]State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2]Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China

出　　处：《Chinese Science Bulletin》2010年第30期3441-3447,共7页

基　　金：supported by the Outstanding Youth Fund of the National Natural Science Foundation of China (50825301);Open Fund of State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology of HUST

摘　　要：By means of distillation precipitation polymerization,the silica-hybrid particles with polyazobenzene shell (PAzo@SiO2) microspheres were prepared with 6-(4-methoxy-4'-oxy-azobenzene) hexyl methacrylate (Azo-M) as monomer,divinylbenzene (DVB) as cross-linker,and ～250 nm vinylated sol-gel silica particles as template. Hollow polyazobenzene microspheres were further developed after selective removal of the silica cores with HF solution. When the content of DVB related to Azo-M is 20 wt%,the acetonitrile is 200 mL,and the polymerization time is 4.5 h,the hollow PAzo microspheres with about 20 nm shell are successfully fabricated. These hollow PAzo microspheres have excellent reversible photoisomerization,and their first-order rate constant of trans-cis isomerization only decreases 11.8% compared with homopolymer of azobenzene (Homo-PAzo).By means of distillation precipitation polymerization, the silica-hybrid particles with polyazobenzene shell （PAzo@SiO2） micro- spheres were prepared with 6-（4-methoxy-4＇-oxy-azobenzene） hexyl methacrylate （Azo-M） as monomer, divinylbenzene （DVB） as cross-linker, and -250 nm vinylated sol-gel silica particles as template. Hollow polyazobenzene microspheres were further developed after selective removal of the silica cores with HF solution. When the content of DVB related to Azo-M is 20 wt%, the acetonitrile is 200 mL, and the polymerization time is 4.5 h, the hollow PAzo microspheres with about 20 nm shell are successfully fabricated. These hollow PAzo microspheres have excellent reversible photoisomerization, and their first-order rate constant of trans-cis isomerization only decreases 11.8% compared with homopolymer of azobenzene （Homo-PAzo）.

关 键 词：空心微球 光响应 甲基丙烯酸甲酯 行为 合成 二乙烯基苯 顺反异构化 偶氮苯 

分 类 号：O633.2[理学—高分子化学] TL639[理学—化学]