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Thermodynamic analysis of the phase equilibrium of the polystyrene‐poly(vinyl methyl ether) system
Author(s) -
Nikulova Uliana V.,
Chalykh Anatoly E.
Publication year - 2021
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.49717
Subject(s) - binodal , polystyrene , phase diagram , upper critical solution temperature , lower critical solution temperature , thermodynamics , flory–huggins solution theory , phase (matter) , ether , materials science , polymer chemistry , polymer , critical point (mathematics) , chemistry , physics , organic chemistry , copolymer , mathematics , mathematical analysis , composite material
Abstract The phase diagrams of polystyrene (PS)‐poly(vinyl methyl ether) (PVME) system obtained via optical interferometry in the study of polymer interdiffusion are presented. The influence of molecular weight of the PS on the position of the binodal curve dome and the critical point is shown. Paired interaction parameters and their temperature dependences are calculated in the framework of Flory‐Huggins theory both for the present experimental diagrams and for the ones, previously obtained by different authors. It is shown that the generalized temperature dependence of the Flory‐Huggins parameter can be used to model phase equilibrium in a wide range of temperatures and compositions. For the first time for PS‐PVME system, the generalized phase state diagram characterized by both lower and upper critical solution temperatures is calculated and constructed.