Abstract
The excess volume of mixing ΔV m of blends of poly(methyl methacrylate) (PMMA) and poly(vinylidene fluoride) (PVDF) was determined by dilatometry. This quantity turned out to be positive for all concentrations, in contradiction to expectations based on the equation-of-state theory. Computer simulations were performed within the framework of this theory to obtain conditions in terms of the equation-of-state variables p∗ and T∗, for which the excess volume of mixing is predicted to be positive. The corresponding values are well beyond the range of those characteristic for PVDF and PMMA. The conclusion is that structural changes induced by strong interactions between the components may be the origin of positive values of ΔV m.
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