The morphology of some reinforced blends of Polystyrene (PS) and Polyvinyl Acetate (PVAc) were estimated by density measurements, showing a definite pattern except that the filler composition increases the densities of the blends with 30/70, 20/80 and 10/90, PS/PVAc having highest values than other compositions. Also, photomicrographs of the different blends show a two phase system appearing bright (PVAc phase) and the other appearing black (PS phase) in virtually all the micrographs, even though the heterogeneity due to phase inversions is relevant for some compositions. For some composition a domain distribution shows considerable miscibility within the range of compositions.
Key words: Phase inversions, domain distribution, miscibility, phase system.
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