A modified hole theory of polymeric fluids. 2. Miscibility behavior and pressure dependence of the system polystyrene/cyclohexane

Abstract

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Application of a constant hole volume Sanchez–Lacombe equation of state to mixtures relevant to polymeric foaming

“…Given the greatly increased complexity, considering the contribution of air to the polymer sample is therefore not justified, except in mixtures featuring very low solubilities. In order to place the performance of the ch-SL theory into context, we follow the example of Nies and Stroeks 45,46 who compared a variant of the Simha-Somcynsky model to the traditional Simha-Somcynsky EOS. In our case, we compare the performance of the constant hole SL-EOS with the traditional SL theory that uses mixing rules, specifically, the one-parameter mixing rule used originally by Sanchez and Lacombe 7 and a twoparameter mixing rule as given by Poser and Sanchez.…”

Evaluation of equation‐of‐state parameters from PVT data

“…This shortcoming can be improved by introducing a weighting factor into Eq. (21). Another weighting is introduced by the number of data points per isobar.…”

“…There are a number of other EOS theories, the bestknown being due to Simha et al [18,19].Amodified version thereof was derived by Nies and Stroeks [20,21]. They are a combination of the lattice fluid model and the cell model of Prigogine [22] (the same as MCM with q = 1) with its Lennard-Jones potential.…”

Quasi-chemical approximation for nonrandomness in the hole theory of polymeric fluids. 2. Miscibility behavior of binary systems: polystyrene in cyclohexane or methyl acetate

“…This term is also present in the HH theory, although in the relevant paper it has not been shown explicitly. 3 The parameters ki and k2 are numerical constants, and (Mo) is the average molar mass. Starting from the Helmholtz free energy, all other thermodynamic properties, e.g., the equation of state and miscibility behavior, can be derived in a straightforward way.…”