Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1997-08-16
Physics
Condensed Matter
Statistical Mechanics
13 pages, Latex, 5 eps-figures, submitted to Fluid Phase Equilibria
Scientific paper
Phase separation in mixtures of polymers and alkanes is investigated with the aid of a recently developed lattice model, based on the Born-Green-Yvon (BGY) integral equation approach to fluids. The system-dependent parameters of the BGY lattice model for binary mixtures are deduced from those of its pure components, which in turn are determined from a comparison with experimental data. The lower critical solution temperatures (LCST's) for polyethylene in various n-alkanes were predicted from the BGY lattice model and compared with experimental data. While the model underestimates the LCST's for the smaller alkanes it reproduces the experimental values very well for the higher alkanes (decane through tridecane). The effect of the chain length of the polymer on the solubility is investigated for the case of decane as a solvent.
Lipson J. E. G.
Luettmer-Strathmann Jutta
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