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Tuning self-assembly and photo-responsive behavior of azobenzene-containing triblock copolymers by combining homopolymers

机译：通过结合均聚物调节含偶氮苯的三嵌段共聚物的自组装和光响应性能

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摘要

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-isomerization rate of azobenzene chromophores increases when PS homopolymers were incorporated into micelles, while with the addition of PMMAZO homopolymers, it decreases. The photo-induced elongation of the aggregates by irradiation of a linearly polarized laser was observed for all the samples, and the deformation degree increases with the weight fraction of azobenzene groups in the parent copolymers, as well as the PMMAZO content for the mixture micelles.
机译：偶氮苯三嵌段共聚物聚环氧乙烷-嵌段-聚苯乙烯-嵌段-聚[6-（4-甲氧基-4'-氧基-偶氮苯）甲基丙烯酸己酯]（PEO-b-PS-b）的自组装行为-PMMAZO）及其与PS或PMMAZO均聚物的混合物通过透射电子显微镜，扫描电子显微镜，激光散射和UV-可见分光光度法进行了研究。发现纯嵌段共聚物自组装成具有核-壳结构的球形胶束。 PS或PMMAZO均聚物的添加不仅可以增加聚集体的尺寸，而且对聚集体的光异构化行为和光变形行为具有显着影响。光异构化研究表明，当用紫外线或可见光照射有机溶液和胶束中的聚合物时，可以获得偶氮苯生色团的完全反式或顺式-反式异构化。当PS均聚物掺入胶束中时，偶氮苯生色团的光异构化速率增加，而加入PMMAZO均聚物则降低。对于所有样品，均观察到了通过线偏振激光的照射而引起的聚集体的光诱导伸长，并且变形程度随着母体共聚物中偶氮苯基团的重量分数以及混合物胶束的PMMAZO含量而增加。

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