Abstract

Copolymers of methyl methacrylate (MMA) with 2-hydroxyethyl methacrylate (HEMA) and 4-methacryloxyethyl trimellitic anhydride (4META) were synthesized. The miscibility regions, for blends of these copolymers with styrene–acrylonitrile (SAN) copolymers were determined. The miscibility region for MMA–HEMA copolymers is larger than that for MMA–4META copolymers. Interaction energies for monomer unit pairs were calculated from the isothermal miscibility maps using the Flory–Huggins theory combined with the binary interaction model. The experimental phase separation temperatures were found to be similar to the spinodal temperatures predicted from the lattice–fluid theory of Sanchez and Lacombe using these interaction energies.

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