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Synthesis and characterization of chiral smectic side‐chain liquid crystalline polysiloxanes and ionomers containing sulfonic acid groups
Author(s) -
Hu Jianshe,
Zhang Baoyan,
Feng Zhiliu,
Wang Hongguang,
Zhou Aijuan
Publication year - 2001
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.1339
Subject(s) - sulfonic acid , differential scanning calorimetry , mesogen , side chain , benzenesulfonic acid , polymer chemistry , polymer , thermal stability , materials science , monomer , fourier transform infrared spectroscopy , phase (matter) , chemistry , organic chemistry , chemical engineering , liquid crystalline , physics , engineering , thermodynamics
Abstract The synthesis of new chiral smectic A (S A ) side‐chain liquid crystalline polysiloxanes (LCPs) and ionomers (LCIs) containing 4‐allyloxy‐benzoyl‐4‐( S ‐2‐ethylhexanoyl) p ‐benzenediol bisate (ABB) as mesogenic units and 4‐[[4‐(2‐propenyloxy)phenyl]azo]benzenesulfonic acid (AABS) as nonmesogenic units is presented. The chemical structures of the monomers and polymers are confirmed by FTIR spectroscopy or 1 H–NMR. Differential scanning calorimetry (DSC), optical polarizing microscopy, and X‐ray diffraction measurements reveal that all the polymers P I –P IV and ionomers P V –P VI exhibit S A texture. The results seem to demonstrate that the tendency toward the S A ‐phase region increases with increasing sulfonic acid concentration, and the thermal stability of the S A phase is determined by the flexibility of the polymer backbones and the interactions of sulfonic acid groups. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2335–2340, 2001