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Abstract
The filler effects on the compatibility and phase separation kinetics of poly(vinyl acetate) (PVA)-poly(methyl methacrylate) (PMMA) mixtures were studied. Cloud-point curves for filled and unfilled PVA-PMMA mixtures were plotted. It was shown that this system exhibited lower critical solution temperature behaviour. The phase separation of filled mixtures occurs at lower temperatures than that of unfilled mixtures. The temperatures of phase separation of mixtures with predominant PVA or PMMA contents exhibit an especially sharp decline. The results of the studies on the kinetics of phase separation show that the phase separation rate of filled mixtures is much lower than that of unfilled mixtures at temperatures equidistant from the corresponding cloud-point curves. It is established that the phase separation of mixtures occurs in two stages. This can be associated with the structure rearrangement of the phases formed during phase separation. The differences in phase separation of filled and unfilled mixtures can be explained by the specific interactions between a filler and one of the components of a binary polymer mixture.
Published Version
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