Bi- and tridimensional solutions: III. Bidimensional mixtures
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In order to obtain a possible relationship between the “apparent” surface temperature B, the coefficient of the first grade terms of virial expansion, and the bidimensional compatibility of polymers, three bidimensional systems were studied: PMMA-PEMA which are compatible with an inflection of the free energy in the mixtures; PMMA-PVA “ideally” compatible, and PVS-PVA incompatible.
The “apparent” temperature θ shows negative deviations from the additive behaviour in the same manner as the coefficient of first grade terms of the expansion into a series in powers of the bidimensional state equations in the case of PMMA-PEMA; a continuous behavior of the same type as collapse pressures in the case of PMMA-PVA whilst the coefficients are additive; lastly in the case of PVS-PVA, it was not possible to determine the temperature θ and the coefficients show an inflection.
KeywordsPolymer Physical Chemistry Free Energy Surface Temperature State Equation
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