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Synthesis and characterization of side‐chain cholesteric liquid‐crystalline polymers derived from steroid substituents
Author(s) -
Hu JianShe,
Zhang BaoYan,
Pan Wei,
Li YuanHao,
Ren ShiChao
Publication year - 2005
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.22700
Subject(s) - differential scanning calorimetry , mesogen , side chain , materials science , polymer , monomer , thermal stability , polymer chemistry , thermogravimetric analysis , phase (matter) , liquid crystal , fourier transform infrared spectroscopy , crystallography , chemistry , organic chemistry , chemical engineering , liquid crystalline , composite material , engineering , thermodynamics , physics , optoelectronics
A series of new cholesteric liquid‐crystalline polysiloxanes derived from steroid substituents were synthesized. The chemical structures of the monomers or polymers obtained were characterized by FTIR, element analyses, 1 H NMR, and 13 C NMR. Their mesogenic properties and thermal stability were investigated by differential scanning calorimetry, thermogravimetric analysis, polarizing optical microscopy, and X‐ray diffraction measurements. Monomers exhibited typical cholesteric focal‐conic or spiral texture. The polymers P 1 P 6 showed cholesteric phase and P 7 displayed smectic phase. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006