Phase separation and coalescence annihilation of liquid crystal textures during polymerization of main-chain liquid crystalline polyesters
Article Abstract:
A study was conducted to examine the phase separation, coalescence and annihilation of liquid crystal textures during polymerization of wholly aromatic main-liquid crystalline polymer. Using a novel thin film polymerization method, it was observed that during the early stage of the polymerization, the liquid crystal domains generated have the disclination strength of +1. The dominant factor affecting the annihilation rate during this stage is the low viscosity characteristics at elevated temperatures.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Chemical kinetic modeling of copolyesterification between o-phthalic anhydride, oleic acid, and neopentyl glycol in bulk at 205 degrees C
Article Abstract:
Research was conducted to examine the kinetics of the bulk copolyesterification at 205 degrees C between o-phthalic anhydride, oleic acid and neopentyl glycol in a nonequimolecular ratio and in the absence of an external catalyst. Results indicate that the overall kinetic order of the copolyesterification is third order. The copolyesterification is three-halves order in carboxylic and three-halves in hydroxyl group concentrations.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Optical properties of a liquid-crystalline random copolyester
Article Abstract:
The photophysical properties of Vectra A910, a liquid-crystalline copolyester consisting of 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid subunits, are investigated. Vectra A910 is found to have a strong fluorescence in the near ultraviolet. Results also show that the time-resolved photoluminescence kinetics are well described by stretched exponential decays and highly dependent on the emission wavelength.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
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