Structure–property relationship of a series of novel mesogen-jacketed liquid-crystalline polymers containing semirigid side chain with different numbers of alkoxy terminal groups
作者:Chang-An Yang、Qian Tan、GuanQun Zhong、HeLou Xie、HaiLiang Zhang、Er-Qiang Chen、Qi-Feng Zhou
DOI:10.1016/j.polymer.2009.12.004
日期:2010.1
A series of vinyl monomers, 2, 5-bis [(4-methoxy benzyl) oxycarbonyl] styrene (MBCS); 2, 5-bis [(3, 5-dimethoxy benzyl) oxycarbonyl] styrene (DMBCS) and 2, 5-bis [(3, 4, 5-trimethoxy benzyl) oxycarbonyl] styrene (TMBCS) were synthesized and polymerized via free radical polymerization. The terminal groups of the semirigid side chain were systematically varied to investigate the effects of their numbers
一系列乙烯基单体,即2,5-双[[4-甲氧基苄基)氧羰基]苯乙烯(MBCS);合成2,5-双[[(3,5-二甲氧基苄基)氧羰基]苯乙烯(DMBCS)和2,5-双[(3,4,5-三甲氧基苄基)氧羰基]苯乙烯(TMBCS)并通过自由基聚合聚合。系统地改变半刚性侧链的端基以研究其数目对所得聚合物的中间相形成能力的影响。通过元素分析,1 H NMR和13 C NMR确认单体的化学结构。用1对聚合物进行表征1 H NMR,凝胶渗透色谱法(GPC)。使用差示扫描量热法(DSC),偏振光显微镜(PLM)以及一维和二维广角X射线衍射(WAXD)研究了相结构和跃迁行为。实验结果表明,聚合物的中间相形成能力随着侧链基团刚性的降低而降低,并随着烷氧基端基数目的增加而增加,并且所有高分子量聚合物均表现出稳定的柱状向列相(Φ ñ)。