Premium
Temperature dependence of unperturbed dimension and interaction parameters of polyester resin in solvents
Author(s) -
Devi G. Rama,
Narender G.,
Raju K. V. S. N.,
Yaseen M.
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210340304
Subject(s) - flory–huggins solution theory , virial coefficient , thermodynamics , endothermic process , exothermic reaction , materials science , solvent , polymer , polyester , enthalpy , intrinsic viscosity , polymer chemistry , viscosity , hildebrand solubility parameter , chemistry , organic chemistry , composite material , adsorption , physics
The flow behaviour of a polyester in various solvents was studied at temperatures ranging from 10 to 80°C. The practical data obtained from the temperature dependence of limiting viscosity number [η] were used to calculate unperturbed dimensions and interaction parameters of the polyester resin in poor, moderate and good solvents. The data provided information regarding conformational transitions in the polymer chains in terms of exothermic or endothermic local ordering of solvents on resin segments and their fixation on polymer coils. The temperature dependence of unperturbed dimensions K e , Flory–Huggins interaction parameter χ 12 , the second virial coefficient A 2 , entropy parameter U 1 , enthalpy parameter K 1 , and viscosity expansion factor α n , has been used to estimate the solvent quality for the resin.