Rigid-rod polyesters with flexible side chains. 4. Thermotropic behavior and phase structures in polyesters based on 1,4-dialkyl esters of pyromellitic acid and 4,4'-biphenol
Rigid-rod polyesters with flexible side chains. 4. Thermotropic behavior and phase structures in polyesters based on 1,4-dialkyl esters of pyromellitic acid and 4,4'-biphenol
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具有柔性侧链的刚性棒聚酯。
DOI：
10.1021/ma00080a026
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发表时间：
1994
期刊：
影响因子：
5.5
通讯作者：
H. Ichimura
中科院分区：
文献类型：
--
作者：
J. Watanabe;B. Harkness;M. Sone;H. Ichimura
通过均苯四酸的1,4-二烯丙酯与联苯酚缩合制备了一系列具有长烷基侧链的刚性棒聚酯，表示为B-Cn。烷基侧链长度从己基 (n=6) 到十八烷基 (n=18) 不等，通过光学显微镜、DSC 和 X 射线测量检查了这些材料的热致转变行为和中间相结构。侧链长度的增加显着降低结晶相的熔点，产生液晶相。已经观察到两种类型的具有层状修饰的液晶相：LC-1和LC-2。这些液晶相的转变行为被描述为侧链长度的函数
A series of rigid-rod polyesters with long alkyl side chains, denoted as B-Cn, have been prepared by condensing 1,4-diallyl esters of pyromellitic acid with biphenol. The alkyl side-chain lengths were varied from hexyl (n=6) to octedecyl groups (n=18), and the thermotropic transition behavior and mesophase structure of these material were examined by optical microscopy, DSC, and X-ray measurements. An increase in the length of the side chain decreases remarlably the melting point of the crystalline phase, giving rise to a liquid crystalline phase. Two types of liquid crystalline phases with layerlike modifications, LC-1 and LC-2, have been observed. The transition behavior of these liquid crystalline phases is described as a function of the side-chain length