MOLECULAR-WEIGHT EFFECT ON THE MISCIBILITY OF POLY(ETHYLENE OXIDE) AND ISOTACTIC POLY(METHYL METHACRYLATE) IN THEIR BLENDS

Blends of poly(ethylene oxide) and isotactic poly(methyl methacrylate) have been studied for a wide range of compositions and molecular weights of one of the components by differential scanning calorimetry and high-resolution, solid-state13C NMR spectroscopy. Proton spin-lattice relaxation times in the rotating frame, T1ρ(H), as well as calorimetric data, indicate compatibility of the components of these blends in the amorphous phase, which were previously reported as immiscible, depending on the molecular weights of the components. Compatibility of the blend components in the melt state has been studied from the NMR dynamic parameters and also been found to be molecular weight dependent. © 1990, American Chemical Society. All rights reserved.