Shaoliang Lin, Yingying Wang, Chunhua Cai, Yaohui Xing, Jiaping Lin, Tao Chen and Xiaohua He
The self-assembly behavior of azobenzene-based triblock copolymers poly(ethylene oxide)- block -polystyrene- block -poly[6-(4-methoxy-4′-oxy-azobenzene) hexyl methacrylate] (PEO- b -PS- b -PMMAZO) and their mixtures with PS or PMMAZO homopolymers was studied by means of transmission electron microscopy, scanning electron microscopy, laser light scattering and UV–vis spectrophotometry. It was found that pure block copolymers self-assembled into spherical micelles with core–shell structures. The addition of PS or PMMAZO homopolymers can not only increase the aggregate size but also have a significant influence on the photo-isomerization behavior and photo-deformation behavior of the aggregate. The photo-isomerization study revealed that a complete trans–cis or cis – trans isomerization of azobenzene chromophores can be acquired when irradiated with UV or visible light for polymers both in organic solutions and in micelles. The photo-isomeriz...
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The self-assembly behavior of azobenzene-based triblock copolymers poly(ethylene oxide)- block -polystyrene- block -poly[6-(4-methoxy-4′-oxy-azobenzene) hexyl methacrylate] (PEO- b -PS- b -PMMAZO) and their mixtures with PS or PMMAZO homopolymers was studied by means of transmission electron microscopy, scanning electron microscopy, laser light scattering and UV–vis spectrophotometry. It was found that pure block copolymers self-assembled into spherical micelles with core–shell structures. The addition of PS or PMMAZO homopolymers can not only increase the aggregate size but also have a significant influence on the photo-isomerization behavior and photo-deformation behavior of the aggregate. The photo-isomerization study revealed that a complete trans–cis or cis – trans isomerization of azobenzene chromophores can be acquired when irradiated with UV or visible light for polymers both in organic solutions and in micelles. The photo-isomeriz...
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