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Phase behavior studies of the system polystyrene‐polybutadiene‐chloroform. I. Application of the flory‐huggins theory
Author(s) -
RobledoMuniz J. G.,
Tseng H. S.,
Lloyd Douglas R.,
Ward Thomas C.
Publication year - 1985
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760251504
Subject(s) - polybutadiene , flory–huggins solution theory , chloroform , polystyrene , polymer , materials science , phase (matter) , polymer chemistry , solvent , thermodynamics , gel permeation chromatography , copolymer , chromatography , chemistry , organic chemistry , composite material , physics
The equilibrium phase behavior of the partially miscible system polystyrene‐polybutadiene‐chloroform was studied at 25°C and 1 atm pressure by using gel permeation chromatography to analyze the conjugate phases. Three narrow molecular weight distribution samples of each polymer were used to provide nine examples of the system for study. The Flory‐Huggins theory was used to determine the polymer‐polymer interaction parameter χ23, When literature values of the two polymer‐solvent interaction parameters χ12 and χ13 were used, the χ23 values generally were found to be negative and to show no distinct concentration dependence. No significant improvement was found when the literature value of only the polybutadiene‐chloroform interaction parameter was used to simultaneously generate values of χ23 and χ12. Values of χ23 at the critical point, χ23, cr , were found to increase with increasing polymer concentration.