Phase equilibria of poly(E⟩-caprolactone)-co-poly(acryl methacrylate)-methylene chloride systems and the phase structure of polymer binary mixtures

Isothermal cross sections of amorphous separation diagrams of the ternary systems poly(E >-caprolactone)-co-poly(acryl methacrylate) Eudragite RS-methylene chloride and poly(E >-caprolactone)-co-poly(acryl methacrylate) Eudragite E-methylene chloride are obtained via the experimental methods of turbidity points and analytical transmission electron microscopy and the calculation semi-empirical method of constructing boundary lines of phase diagrams. It is shown that the composition of copoly(acryl methacrylate) affects the length of the solubility region in the ternary phase diagram and the character of the anisotropy of films prepared via solvent evaporation. The determination of coordinates of figurative points corresponding to the completion of phase separation shows that the mechanism of phase separation for both systems is of the spinodal type. The specific orientation of polycaprolactone crystallites during film preparation from the poly(E >-caprolactone)-Eudragite RS mixture is determined by the morphology of the film formed during solvent evaporation and the phase composition.