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New side‐chain liquid‐crystalline ionomers. I. Synthesis and characterization of a homopolymer derived from ionic mesogenic groups
Author(s) -
Zang BaoLing,
Hu JianShe,
Meng FanBao,
Zhang BaoYan
Publication year - 2004
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.20692
Subject(s) - mesogen , monomer , differential scanning calorimetry , polymer chemistry , materials science , thermogravimetric analysis , ionic bonding , phase (matter) , ionic liquid , polymer , side chain , fourier transform infrared spectroscopy , ionomer , liquid crystal , crystallography , copolymer , chemistry , organic chemistry , chemical engineering , ion , liquid crystalline , physics , catalysis , optoelectronics , engineering , composite material , thermodynamics
Liquid‐crystalline monomer cholesteryl 4‐allyloxybenzoate (M 1 ), new ionic mesogenic monomer cholesteryl 4‐allyloxy‐3‐(potassium sulfonate)benzoate (M 2 ), and corresponding polymer P 1 and ionomer P 2 were synthesized. The chemical structures of the monomers and homopolymer were confirmed with Fourier transform infrared and 1 H‐NMR spectroscopy. The mesogenic properties were studied with differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy, and X‐ray diffraction measurements. The effect of the ionic units on the phase behavior was examined. M 1 showed a cholesteric phase, and M 2 revealed a smectic A phase. P 1 and P 2 displayed smectic A phases. The experimental results demonstrated that the addition of ionic units to the mesogenic molecule not only affected the phase‐transition temperature but also changed the mesogenic phase type. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2511–2516, 2004