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Single‐point determination of intrinsic viscosity of wholly aromatic thermotropic copolyesters in 1,1,1,3,3,3‐hexafluoro‐2‐propanol
Author(s) -
Liu Yongjian
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.2200
Subject(s) - thermotropic crystal , intrinsic viscosity , hydroxybenzoic acid , viscosity , polymer chemistry , transesterification , chemistry , propanol , materials science , polymer , organic chemistry , catalysis , composite material , liquid crystalline , methanol
A series of wholly aromatic thermotropic copolyesters based on 4‐hydroxybenzoic acid, hydroquinone, and 2,6‐naphthalene dicarboxylic acid were synthesized by direct melt polymerization with or without different added transesterification catalysts. Nine procedures for calculation of the intrinsic viscosities from a single viscosity measurement for polymer solutions, including a proposed one, were applied for the thermotropic copolyesters in 1,1,1,3,3,3‐hexafluoro‐2‐propanol at 30°C. Various forms of the Huggins and Kraemer equations, singly or combined, yielded intrinsic viscosities that were in good agreement with extrapolated values obtained in the usual manner from multipoint viscosity measurements over a wide range of concentrations. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3396–3401, 2001