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Single‐Point Determination of Intrinsic Viscosity of Semirigid Thermotropic Copolyesters in Phenol/1,1,2,2‐Tetrachloroethane
Author(s) -
Liu Yongjian
Publication year - 2001
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20011001)286:10<611::aid-mame611>3.0.co;2-9
Subject(s) - thermotropic crystal , terephthalic acid , intrinsic viscosity , materials science , copolyester , hydroquinone , viscosity , phenol , condensation polymer , inherent viscosity , hydroxybenzoic acid , yield (engineering) , polymer chemistry , ethylene , arrhenius equation , melting point , polymer , polyester , organic chemistry , chemistry , composite material , activation energy , liquid crystalline , catalysis
A series of semirigid thermotropic copolyesters with different compositions were prepared from p ‐hydroxybenzoic acid (HBA), hydroquinone (HQ), terephthalic acid (TPA) and poly(ethylene terephthalate) (PET) by acidolysis reaction and following polycondensation. Fourteen procedures of calculation of the intrinsic viscosities from a single viscosity measurement for polymer solutions, including three proposed ones, have been applied for the copolyesters in phenol/1,1,2,2‐tetrachloroethane (60/40, v/v) at 30°C. It is found that various forms of the Huggins and Kraemer equations, used singly or in a combined form, yield intrinsic viscosities in good agreement with those extrapolated values obtained in the usual manner from multipoint viscosity measurements over a wide range of concentrations.