Influences of Hydrogen Bonding and Peripheral Chain Length on Mesophase Structures of Mesogen-Jacketed Liquid Crystalline Polymers with Amide Side-Chain Linkages
Influences of Hydrogen Bonding and Peripheral Chain Length on Mesophase Structures of Mesogen-Jacketed Liquid Crystalline Polymers with Amide Side-Chain Linkages
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DOI：
10.1021/ma102444t
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发表时间：
2011-02
期刊：
影响因子：
5.5
通讯作者：
Yanhua Cheng;Wenping Chen;Zhihao Shen;Xinghe Fan;Meifang Zhu;Qifeng Zhou
中科院分区：
文献类型：
--
作者：
Yanhua Cheng;Wenping Chen;Zhihao Shen;Xinghe Fan;Meifang Zhu;Qifeng Zhou
设计并通过常规自由基聚合成功合成了一系列具有酰胺核和侧链两端不同长度的柔性尾部的介晶夹套液晶聚合物聚{2,5-双[(4-烷氧基苯基)氨基羰基]苯乙烯}（P-Cm，其中m是烷氧基中的碳原子数，m=1,4,8,12）。这些聚合物的中间相结构取决于外围链中碳原子的数量。广角X射线衍射和偏光显微镜结果表明，m≥4的聚合物可形成近晶A相，而具有甲氧基端基的聚合物(P-C1)可形成柱状向列相。变温 FTIR 和 2D IR 分析的结果表明，侧链酰胺基团之间的氢键可能在形成和稳定这些液晶相方面发挥重要作用。
A series of mesogen-jacketed liquid crystalline polymers, poly{2,5-bis[(4-alkoxyphenyl)aminocarbonyl]styrene} (P-Cm, where m is the number of carbon atoms in the alkoxy groups, and m = 1, 4, 8, 12), with an amide core and flexible tails of varying lengths on the two ends in the side chain were designed and successfully synthesized via conventional radical polymerization. The mesophase structures of these polymers were dependent on the number of carbon atoms in the peripheral chains. Wide-angle X-ray diffraction and polarized light microscopy results revealed that the polymers with m ≥ 4 could form smectic A phases, while a columnar nematic phase could be formed for the polymer with methoxy end groups (P-C1). The hydrogen bonding among the side-chain amide groups might play an important role in forming and stabilizing these liquid crystalline phases, which was suggested by the results from variable-temperature FTIR and 2D IR analyses.