ABSTRACT
Rheological properties of binary polymer mixtures have been discussed in many sources. Meanwhile, rheological properties of binary polymer mixtures in a molten state are strongly governed by thermodynamics of interaction between two components. The thermodynamic state is determined by a phase diagram of the binary mixture. There are two known types of phase diagrams for linear polymer blends, with upper and lower critical solution temperatures (UCST and LCST). Taking the phase diagram as a basis, the various thermodynamic states may be distinguished for the melts of the polymeric mixtures. Introducing fillers in the melt of a binary polymer mixture leads to the following consequences. The main effect is a selective adsorption of one of the components at the interface with the solid. Above the critical point in the phase diagram (for the systems with UCST) polymer melt is a solution of one component into another.
