Novel Amphiphilic Diblock and Triblock Liquid-Crystalline Copolymers with Well-Defined Structures Prepared by Atom Transfer Radical Polymerization
Novel Amphiphilic Diblock and Triblock Liquid-Crystalline Copolymers with Well-Defined Structures Prepared by Atom Transfer Radical Polymerization
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DOI：
10.1002/marc.200500498
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发表时间：
2005-10
影响因子：
4.6
通讯作者：
Haifeng Yu;A. Shishido;T. Ikeda;T. Iyoda
中科院分区：
文献类型：
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作者：
Haifeng Yu;A. Shishido;T. Ikeda;T. Iyoda
以亲水性聚（环氧乙烷）宏观引发剂（PEOBr）为原料，以CuCl/1,1,4,7,10,10-六甲基三乙基三胺为催化剂，采用原子转移自由基聚合（ATRP）法制备了新型两亲性二嵌段共聚物peo -嵌段聚（11-4-氰基二苯氧基）甲基丙烯酸酯（PEO-b-PMA(11CB)）。然后通过第二次ATRP将聚（11-[4-（4-丁基苯基偶氮）苯氧基]十一烷基甲基丙烯酸酯）偶氮嵌段引入共聚物序列，合成相应的三嵌段共聚物PEO-b-PMA(11CB)-b- pma （11Az）。这两种两亲嵌段共聚物结构明确，分子量分布窄，在较宽的温度范围内表现为近晶液晶相。
Based on a hydrophilic poly(ethylene oxide) macroinitiator (PEOBr), a novel amphiphilic diblock copolymer PEO-block-poly(11-4-cyanobiphenyloxy)undexyl) methacrylate) (PEO-b-PMA(11CB) was prepared by atom transfer radical polymerization (ATRP) using CuCl/1,1,4,7,10,10-hexamethyltriethylenetriamine as a catalyst system. An azobenzene block of poly (11-[4-(4-butylphenylazo)phenoxyl]undecyl methacrylate) was then introduced into the copolymer sequence by a second ATRP to synthesize the corresponding triblock copolymer PEO-b-PMA(11CB)-b-PMA(11Az). Both of the amphiphilic block copolymers had well-defined structures and narrow molecular-weight distributions, and exhibited a smectic liquid-crystalline phase over a wide temperature range.