Guoliang Jiang, Huanhuan Cai, Zhihao Shen, Xinghe Fan and Qifeng Zhou Influence of fluorinated substituent and terminal length on phase behavior of mesogen-jacketed liquid crystalline polymers with a biphenyl mesogen Journal of Polymer Science Part A: Polymer Chemistry 51
Two series of mesogen-jacketed liquid crystalline polymers, PF3Cm and PC4Cm, were synthesized. Wide-angle X-ray diffraction measurements show that the mesophase structures of these polymers are dependent on the number of the carbon atoms in the fluorocarbon substituent and the property of the other terminal substituent. Polymers with fluorocarbon substituents enter into columnar nematic phases when m ≥ 4, whereas the polymer PF3C1 exhibits no liquid crystallinity. For polymers with butyl substituents, columnar nematic phases form when the number of carbon atoms at both ends of the side chain is not equal at high temperatures and disappear after the polymers are cooled to ambient temperature. However, when the polymer has the same number of carbon atoms at both ends of the side chain, a hexagonal columnar phase develops, and this phase remains after the polymer is cooled.
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