A possible criterion for estimating the miscibility of polymers

A criterion for estimating and predicting the miscibility of polymers is proposed, which is based on analysis of the adhesion energy and intermolecular forces acting at the interface between two polymers. The conditions of complete or partial miscibility and absolute incompatibility of polymers are studied. In the first two cases, a general dependence of the glass transition temperature on the polymer blend composition is analyzed. The relationships obtained were verified for two pairs of compatible polymers: poly(styrene)-poly(vinyl methyl ether) and poly(styrene)-poly(phenylene oxide). A good agreement between the calculated and experimental data was obtained.