偶氮苯
两亲性
光异构化
高分子化学
叠氮化物
发色团
材料科学
聚合物
聚合
环加成
光化学
共聚物
化学
有机化学
催化作用
复合材料
异构化
作者
Yuhan Sun,Zhao Wang,Yiwen Li,Zhengbiao Zhang,Wei Zhang,Xiangqiang Pan,Nianchen Zhou,Xiulin Zhu
标识
DOI:10.1002/marc.201500136
摘要
Herein, the first example of photosensitive cyclic amphiphilic homopolymers consisting of multiple biphenyl azobenzene chromophores in the cyclic main chain tethered with hydrophilic tetraethylene glycol monomethyl ether units is presented. The synthetic approach involves sequentially performed thermal catalyzed "click" step-growth polymerization in bulk, and Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) intramolecular cyclization from α-alkyne/ω-azide linear precursors. It is observed that such amphiphilic macrocycles exhibit increased glass transition temperatures (Tg ), slightly faster trans-cis-trans photoisomerization, and enhanced fluorescence emission intensity compared with the corresponding linear polymers. In addition, the cyclic amphiphilic homopolymers self-assemble into spherical nanoparticles with smaller sizes which possess slower photoresponsive behaviors in a tetrahydrofuran/water mixture compared with those of the linear ones. All these interesting observations suggest that the cyclic topology has a great influence on the physical properties and self-assembly behavior of these photoresponsive amphiphilic macrocycles in general.
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