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Solvent power effect on graessley's time constant in concentrated polystyrene solutions
Author(s) -
Quadrat Otakar,
Mikeŝov´ Jana,
Prokopová Eva
Publication year - 1985
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.1985.070300907
Subject(s) - polystyrene , solvent , viscosity , thermodynamics , relaxation (psychology) , polymer , relative viscosity , constant (computer programming) , intrinsic viscosity , reduced viscosity , materials science , polymer chemistry , temperature dependence of liquid viscosity , velocity gradient , chemistry , organic chemistry , composite material , physics , psychology , social psychology , computer science , programming language
Results of our measurements of polystyrene solutions and those reported in the literature demonstrate the common dependence of Graessley's relaxation time on the product of concentration and molecular weight, irrespective of the solvent power and its viscosity, and of temperature. Such behavior is in agreement with the conclusions reached in our previous paper, namely, that the shear stress dependence of viscosity of this polymer in solvents differing considerably in viscosity and solvent power may be unified by plotting relative viscosity against the product of velocity gradient and Rouse's relaxation time.