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New thermochromic liquid–crystalline polymer: Synthesis and phase behavior
Author(s) -
Wang Ying,
Hu JianShe,
Zhang BaoYan,
Jiang TongYing
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.22040
Subject(s) - mesophase , mesogen , differential scanning calorimetry , thermochromism , materials science , polymer , thermogravimetric analysis , thermal stability , liquid crystal , phase (matter) , polymer chemistry , monomer , fourier transform infrared spectroscopy , chemical engineering , side chain , organic chemistry , chemistry , liquid crystalline , composite material , thermodynamics , physics , optoelectronics , engineering
A series of new thermochromic side‐chain liquid–crystalline polymers were prepared. The chemical structures of the resulting monomers and polymers were characterized by element analyses, FTIR, 1 H‐NMR, and 13 C‐NMR. Their mesogenic properties were investigated by differential scanning calorimetry, thermogravimetric analyses, polarizing optical microscopy, and X‐ray diffraction measurements. The influence of the content of dye groups on phase behavior of the polymers was discussed. The polymers P 1 –P 3 showed smectic phase, and P 4 –P 7 revealed cholesteric phase. The polymers containing less than 30 mol % of the dye groups showed good solubility, reversible phase transition, wider mesophase temperature ranges, and higher thermal stability. Experimental results demonstrated that the clearing temperature and mesophase temperature ranges decreased with increasing the concentration of the dye groups. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 329–335, 2005