Control of Phase-transition Behavior and Polymerization Capability by Methyl Addition to Dialkyl Fumarates Bearing Cyanobiphenyl Mesogens
作者:Nozomu Fujii、Tsuyoshi Michinobu、Kiyotaka Shigehara
DOI:10.1246/cl.2007.1052
日期:2007.8.5
Addition of methyl groups to dialkyl fumarates bearing two cyanobiphenyl mesogens dramatically changed the phase-transition behavior and polymerization capability. No mesophase appeared and radical polymerization did not proceed in the absence of the branched methyl groups, whereas well-defined liquid-crystal phases were observed in the ambient temperature range and high molecular weight polymers were obtained in the presence of the branched methyl groups. An increase in the number of the attached methyl groups decreases the liquid crystalline temperature width as well as the molecular weight of the resulting polymers.
向含有两个氰基联苯介晶基团的二烷基富马酸盐中加入甲基,显著改变了其相变行为和聚合能力。在缺乏支链甲基的情况下,无法出现介晶相,并且自由基聚合也不能进行;而在存在支链甲基的情况下,在环境温度范围内观察到了明确定义的液晶相,并获得了高分子量的聚合物。随着所附甲基数量的增加,液晶相的温度宽度以及所得聚合物的分子量都逐渐下降。