Abstract
In a continuing study on the properties of the compressible lattice model, the equation of state and miscibility behavior of binary mixtures of lattice chains is explored. Monte Carlo simulations are performed in the NpT and semi-grand-canonical μpT ensemble for varying compositions and several combinations of the three interactional parameters characterizing the binary mixture. In all simulations the chain lengths of both components are taken to be equal. In addition to the thermodynamic information, microscopic information on the number of different contacts and the mean square end-to-end distance is collected, too. The Monte Carlo results are used to examine the predictions of lattice model theories derived from statistical mechanics. To this purpose the nonrandom mixing theory for the binary compressible mixture, based on the quasi-chemical approximation of Guggenheim, is presented. The theory is compared in detail to the collected simulation data. Although the theory is completely general, the compar...
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