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The Perturbed-Chain SAFT equation-of-state is applied to binary and ternary mixtures of polymers, solvents and gases. Using a temperature-independent interaction parameter k_ij for each binary system, the Perturbed-Chain SAFT equation-of-state gives good correlations of the appropriate phase behavior over wide ranges of conditions. Copolymers or polymers with short-chain branching can be described using the copolymer version of PC-SAFT. In this version, the chain segments are allowed to differ in size and in attractive forces. Using this concept, copolymers like poly(ethylene-co-propylene) and poly(ethylene-co-vinyl acetate) could be modeled using the knowledge of the homopolymer properties and only one additional parameter which describes the attractive interactions between the unlike copolymer segments. Comparisons to the original SAFT model reveal an improvement of the proposed model.