Abstract
The plateau modulus and zero-shear melt viscosity of binary compatible blends of poly(methyl methacrylate) and an azeotropic poly(styrene-acrylonitrile) were measured by dynamic oscillation and shear creep, and used to analyse the entanglement behaviour between dissimilar chains and the compositional dependence of zero-shear melt viscosity. It is found that, due to specific interchain interactions (which give rise to the molecular miscibility), dissimilar chains are less likely to entangle than similar chains. The zero-shear melt viscosity η 0 obeys the simple relation, log η 0 = ø 1 log η 01 + ø 2 log η 02, where ø is the volume fraction, and the subscripts 1 and 2 refer to the two pure components, respectively, for the present blends.
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