A visible light responsive azobenzene-functionalized polymer: Synthesis, self-assembly, and photoresponsive properties
A visible light responsive azobenzene-functionalized polymer: Synthesis, self-assembly, and photoresponsive properties
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可见光响应偶氮苯官能化聚合物：合成、自组装和光响应特性
DOI：
10.1002/pola.27747
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发表时间：
2015-12-01
影响因子：
--
通讯作者：
Han, Guoxiang
中科院分区：
文献类型：
--
作者：
Wang, Guojie;Yuan, Dong;Han, Guoxiang
合成了一种新型的含偶氮苯丙烯酸酯单元与亲水丙烯酸单元组成的可见光响应性无规共聚物。偶氮苯分子的四个邻位均带有甲氧基，通过重氮化一步转化容易地合成。由于其两亲性，所制备的聚合物可以在水中自组装成纳米颗粒。四邻甲氧基取代偶氮苯功能化聚合物在520 nm的绿色光照射下表现出反式-顺式光开关，在420 nm的蓝光照射下表现出顺式-反式光开关。TEM和DLS分析了自组装纳米粒子的形貌。由于该共聚物具有pH响应性丙烯酸基团，因此可以通过调节pH值来实现负载分子从纳米颗粒的控制释放。纳米粒子中负载的尼罗红的荧光可以在可见光照射下调谐。偶氮苯功能化聚合物在可见光下的可逆光开关特性使其在完全不使用紫外光的情况下具有广泛的应用前景。(c)2015 Wiley Periodicals，Inc.
A novel visible light responsive random copolymer consisting of hydrophobic azobenzene-containing acrylate units and hydrophilic acrylic acid units has been prepared. The azobenzene molecule bearing methoxy groups at all four ortho positions is readily synthesized by one-step conversion of diazotization. The as-prepared polymer can self-assemble into nanoparticles in water due to its amphiphilic nature. The tetra-o-methoxy-substituted azobenzene-functionalized polymer can exhibit the trans-to-cis photoswitching under the irradiation with green light of 520 nm and the cis-to-trans photoswitching under the irradiation with blue light of 420 nm in both solution and aggregate state. The morphologies of the self-assembled nanoparticles are revealed by TEM and DLS. The controlled release of loaded molecules from the nanoparticles can be realized by adjusting pH value since the copolymer possesses pH responsive acrylic acid groups. The fluorescence of loaded Nile Red in the nanoparticles can be tuned upon the visible light irradiation. The reversible photoswitching of the azobenzene-functionalized polymer under visible light may endow the polymer with wide applications without using ultraviolet light at all. (c) 2015 Wiley Periodicals, Inc.