【摘要】 通过原子转移自由基聚合(ATRP)与ATRP衍生物化学修饰结合的方法,合成了含一条聚苯乙烯(PS)臂、两条聚[乙烯基对苯二甲酸二(对甲氧基苯酚)酯](PMPCS)臂的Y型星形杂臂甲壳型液晶聚合物PS(PMPCS)2.采用核磁共振谱(1H NMR)和凝胶渗透色谱(GPC)手段确定了聚合物的基本结构,所得聚合物为接近单分散的星形杂臂聚合物.采用热分析(DSC)、热台偏光显微镜(POM)和X衍射仪(WXAD)研究了此类星形杂臂共聚物的热致液晶行为.液晶性研究显示,其液晶性与刚性链段PMPCS的长度密切相关,只有当杂臂共聚物中刚性PMPCS链段达到一定长度后才出现液晶性.更多还原

【Abstract】 Y-type miktoarm star Mesogen-jacketed liquid crystal copolymers carrying one polystyrene(PS) and two poly{2,5-bis[(4-methoxyphenyl)-oxycarbonyl] styrene} arms(PMPCS) were synthesized by com-bination of atom transfer radical polymerization(ATRP) and ATRP method of chemically modified deriva-tives.Their architectures were confirmed by GPC and 1H NMR spectroscopy.The liquid crystalline behavior of these copolymers was studied by DSC,POM and WXAD.Their liquid-crystalline phase intently depends on the molecular weights of the rigid rod arm of miktoarm star copolymers.The liquid-crystalline phase only appeared after a certain length of PMPCS.更多还原