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Synthesis, characterization and electrorheological effect of sulfosalt‐type liquid‐crystalline ionomers containing polyaniline units
Author(s) -
Meng FanBao,
Zhou NaiYu,
Du Chang,
Gao HongMei,
He XiaoZhi
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39593
Subject(s) - sulfonic acid , materials science , ionomer , mesophase , polyaniline , liquid crystal , polymer chemistry , glass transition , polymer , chemical engineering , composite material , copolymer , optoelectronics , engineering , polymerization
A series of main‐chain liquid‐crystalline polymers (LCPs) with pendant sulfonic acid groups have been synthesized by use of biphenyl‐4,4′‐diol, 6,7‐dihydroxynaphthalene‐2‐sulfonic acid, and bis(4‐(chlorocarbonyl)phenyl) decanedioate in a one‐step esterification reaction. Emeraldine base form of polyaniline (PAN) is doped by the synthesized sulfonic acid‐containing LCPs to obtain PAN–LCP ionomers. A series of electrorheological (ER) fluids are prepared using the synthesized PAN–LCP ionomers and silicone oil. The chemical structure, liquid‐crystalline behavior, dielectric property of LCPs, and PAN–LCP ionomers, and ER effect of the ER fluids are characterized by use of various experimental techniques. The synthesized sulfonic acid‐containing LCPs and PAN–LCP ionomers display nematic mesophase. The PAN–LCP ionomers show a slight elevation of glass transition temperatures and decrease of enthalpy changes of nematic–isotropic phase transition compared with corresponding sulfonic acid‐containing LCPs. The relative permittivity of the PAN–LCP ionomers is much higher than that of the corresponding sulfonic acid‐containing LCPs. The ER effect of the PAN–LCP ionomer dispersions is better than PAN dispersions, suggesting a synergistic reaction should be occurred among liquid crystalline component, and PAN part under electric fields. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3395–3403, 2013