Compatibility and viscosity of polycarbonate-poly(methyl methacrylate) blend

The compatibility of components in the PC (M w = 2.5 x 10 4 )-PMMA (M w = 1.5 x 104, 7.4 x 104, 30 x 10 4 ) blend at a temperature above the T g of PC was studied by the microinterference method. The constructed phase diagrams are shown to contain an UCST. For the PC-PMMA system (M w = 1.5 x 104), the kinetics of diffusion mixing and viscosity properties (at T = 240°C) were characterized at different points of the phase diagram. The corresponding dependence of viscosity on composition shows a local minimum near a binodal at a higher content of PC.