Abstract
Dynamic-mechanical, DSC, and fracture-toughness measurements are reported for blends of it-PMMA with at-PMMA and syndiotactic-rich PMMA, both in the amorphous state and after solvent and thermally induced crystallization. Crystalline stereocomplex forms even in the blends of 74% isolactic with commercial at-PMMA under SIC. Some stereoblock PMMA shows two melting points and two distinct crystalline forms; one corresponds to it-PMMA the other probably to stereocomplex. Microcrystallinity in the blends greatly enhances stiffness. The decline of the storage shear modulus with temperature involves several processes. Blending of it-PMMA (even low mol. wt) into at-PMMA greatly improves its fracture toughness.
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