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Liquid‐liquid equilibria in polymer blends–molecular weight effects
Author(s) -
Somani R. H.,
Shaw M. T.
Publication year - 1984
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.760240812
Subject(s) - miscibility , thermodynamics , polystyrene , materials science , flory–huggins solution theory , polymer , equation of state , polymer blend , phase (matter) , interaction energy , molecule , organic chemistry , chemistry , composite material , physics , copolymer
Flory's equation‐of‐state theory has been successfully used by several scientists to predict the qualitative nature of the liquid‐liquid phase equilibria in polymer blends. This theory in its most simple form requires characteristic PVT parameters for each component plus an interaction energy parameter for the mixture. The melt titration technique was used to measure the miscibility of a series of polystyrene fractions ( Mw = 4000 to 1,800,000) in low density polyethylene. Because the PVT properties of both of these polymers are well known, the experimental results could be compared with the predicted equilibrium compositions from Flory's equation‐of‐state theory using the interaction energy as an adjustable parameter. This comparison led to the conclusion that the interaction energy parameter may have some molecular weight dependence.