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首页> 外文期刊>RSC Advances >Photoresponsive assemblies of linear-dendritic copolymers containing azobenzene in the dendron interior: the effect of the dendron structure on dye encapsulation and release
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Photoresponsive assemblies of linear-dendritic copolymers containing azobenzene in the dendron interior: the effect of the dendron structure on dye encapsulation and release

机译：DENDRON内部含有偶氮苯的线性树枝状共聚物的光响应性组装：树突结构对染料封装和释放的影响

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Hydrophobic dendrons with different numbers and positions of azobenzenes as well as different groups – benzyl and dodecyl, on the periphery were synthesised and attached to poly(ethylene glycol) using copper-catalysed azide–alkyne cycloaddition to obtain linear-dendritic copolymers. Self-assembly of the polymers in aqueous solution was characterised using dynamic light scattering (DLS), transmission electron microscopy (TEM) and critical micelle concentration (cmc). Formation of H-aggregates during micellisation was shown for polymers with a higher number of azobenzene units. Photoisomerisation of azobenzene in the assemblies was studied and the rate constant of thermal photoisomerisation was calculated. Release of hydrophobic dye Nile red upon photoisomerisation of azobenzene occurred without disruption of micellar aggregates. Dye release varied with the pathway – thermal or visible light irradiation, followed for cis – trans isomerisation. The encapsulation capacity of the micelles and extent of dye release in either pathway were found to be influenced by the dendron structure. A polymer with a lower number of azobenzenes and aliphatic periphery on the dendron showed significantly different behaviour than polymers with a larger number of aromatic units.
机译：使用铜催化的叠氮化物 - 炔环加入，合成具有不同数量和偶氮苯的不同数量和偶氮苄基和十二烷基，与不同的群体 - 苄基和十二烷基，与聚（乙二醇）合成并连接到聚（乙二醇）上，以获得线性树枝状共聚物。使用动态光散射（DLS），透射电子显微镜（TEM）和临界胶束浓度（CMC）来表征水溶液中聚合物的自组装。显示胶束期间的H-聚集体，显示为具有较高数量的偶氮苯单元的聚合物。研究了组件中偶氮苯并脱离，并计算了热光致硅酸的速率常数。疏水染料尼罗红硅染料在偶氮苯并异构化时发生，而不会破坏胶束聚集体。染料释放随通路 - 热或可见光照射而变化，随之而来的是CIS - 反式异构化。发现胶束的封装能力和任一途气中染料释放程度的释放程度受到树突结构的影响。具有较少数量偶氮苯的聚合物和树枝状上的脂族周边显示出比具有较大数量的芳族单元的聚合物显着不同的行为。

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