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This study focuses on the preparation of compatible blends with the poly(methyl methacrylate) (PMMA) using a reactive terpolymer maleic anhydridestyrene-vinyl acetate (MA-St-VA). In the first series of experiments, binary blends of the PMMA and the MA-St-VA terpolymer have been prepared in tetrahydrofurane. The PMMA and the MA-St-VA terpolymer formed the compatible blends. The effects on thermomechanical properties of MA-St-VA terpolymer ratio in the blends were studied. The glass transition temperatures (T g ), thermal expansion coefficient (␣), and other thermomechanical parameters for the blends have been established by TMA method and the compatibility of two polymers has been evaluated by these TMA parameters. The addition of MA-St-VA terpolymer to PMMA made a plasticizing effect on PMMA. This effect regularly changed with the increasing of the terpolymer in the blends.

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