Synthesis, nanostructures, and functionality of amphiphilic liquid crystalline block copolymers with azobenzene moieties
Synthesis, nanostructures, and functionality of amphiphilic liquid crystalline block copolymers with azobenzene moieties
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DOI：
10.1021/ma011859j
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发表时间：
2002-03
期刊：
影响因子：
5.5
通讯作者：
Yanqing Tian;Kazuhito Watanabe;X. Kong;J. Abe;T. Iyoda
中科院分区：
文献类型：
--
作者：
Yanqing Tian;Kazuhito Watanabe;X. Kong;J. Abe;T. Iyoda
采用原子转移自由基聚合(ATRP)方法合成了一系列含有偶氮苯介元的聚{11-[4-(4-丁基苯偶氮)苯氧基]甲基丙烯酸十一酯}的液晶均聚物。均聚物的数均相对分子质量在6100-23500之间，窄多分散性小于1.17。热分析表明，均聚物为单层近晶A相、近晶C相和未知近晶X相。其转变温度随相对分子质量的增加而略有升高，并在21500左右趋于稳定。用ATRP法制备了具有一定长度的柔性聚乙二醇链段为亲水线圈的新型两亲性液晶线圈。液晶线圈二嵌段共聚物的窄多分散性小于1.11。用透射电子显微镜研究了嵌段共聚物薄膜的形貌。
A series of liquid crystalline (LC) homopolymers of poly{11-[4-(4-butylphenylazo)phenoxy]undecyl methacrylate}containing an azobenzene mesogen with different degrees of polymerization were synthesized by using the atom transfer radical polymerization (ATRP) method. The homopolymers were prepared with a range of number-average molecular weights from 6100 to 23 500 with narrow polydispersities of less than 1.17. Thermal investigation showed that the homopolymers exhibit monolayer smectic A, smectic C, and an unknown smectic X phases. The transition temperatures increase slightly with the increase of the molecular weights and level off at around 21 500. Novel amphiphilic LC-coil diblock copolymers with a defined length of a flexible poly(ethylene glycol) segment as the hydrophilic coil were also prepared by the ATRP method. The LC-coil diblock copolymers exhibit narrow polydispersities of less than 1.11. Morphologies of the thin films of the block copolymers were investigated by using transmission electron m...