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Thermotropic liquid‐crystalline polymers: Synthesis, characterization, and properties of poly(azomethine esters)
Author(s) -
Shukla Utkarsh,
Rao K. V.,
Rakshit Animesh Kumar
Publication year - 2003
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.11618
Subject(s) - thermotropic crystal , differential scanning calorimetry , thermogravimetric analysis , materials science , thermal stability , polymer , crystallinity , inherent viscosity , liquid crystal , polymer chemistry , condensation polymer , fourier transform infrared spectroscopy , intrinsic viscosity , chemical engineering , composite material , thermodynamics , liquid crystalline , physics , optoelectronics , engineering
Abstract A series of poly(azomethine ester) copolymers were synthesized by the solution polycondensation method with different diamines. The synthesized polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), hot‐stage polarized microscopy, wide‐angle X‐ray diffraction, and solution viscosity. All polymers showed good thermal stability. The thermotropic liquid‐crystalline properties were examined by DSC and by microscopic observations. Except for one, all of the polymers showed nematic liquid‐crystalline behavior. The effects of temperature on crystallinity and the substituent on solubility, thermal stability, melting temperature, and viscosity were also studied. The voluminosity and shape factor were also computed from the viscosity data. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 153–160, 2003