Relaxation character of the phase separation in polypropylene solutions and blends

The methods of cloud points X-ray diffraction, DTA, and polarization and electron microscopy were used to study the relaxation character of the phase separation in the polypropylene-chlorobenzene and polypropylene-poly(vinyl alcohol) systems. The concentration dependences of the parameter of interaction between the components were calculated. An increase in the cooling rate of solutions and blends results in a considerable shift of the boundary curves and in a change of their shape due to changeover from crystalline- to amorphous-type phase separation.