The
liquid–liquid equilibrium (LLE) and interfacial tensions
of binary and ternary polymer solutions of polystyrene in cyclohexane
and methylcyclohexane are investigated. The chain length dependent modified double lattice model (MDL-CL)
is applied to describe experimental phase diagrams measured by thermo-optical
analysis. The proposed model is also combined with the modified density
gradient theory to calculate interfacial tension between two coexisting
liquid phases of the investigated systems. The calculated results
of LLE and interfacial tensions using the MDL-CL model combined with
the modified density gradient theory show good agreement with experimental
data. The interfacial tension of the ternary system (polystyrene +
cyclohexane + methylcyclohexane) is described with the parameters
obtained from the binary subsystems (polystyrene + cyclohexane and
polystyrene + methylcyclohexane). A comparison of experimental and
theoretical phase behaviors and interfacial tensions demonstrates
that the theoretical approach is able to describe the experimental
result with a few adjustable parameters.
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