MOLECULAR WEIGHT EFFECT ON THE MISCIBILITY OF POLY(ETHYLENE OXIDE)/ISOTACTIC POLY(METHYL METHACRYLATE) BLENDS.
01 January 1990
Blends of poly(ethylene oxide) and isotactic poly(methyl methacrylate) have been studied for a wide range of composition and molecular weights of one of the components by differential scanning calorimetry and high resolution solid state sup 13 C NMR spectroscopy. Proton spin-lattice relaxation times in the rotating frame, T sub {1 rho} (H), as well as calorimetric data, evidence the compatibility of these blends in the amorphous phase, previously reported as immiscible, depending on the molecular weights of the components. Compatibility of the blends in the melt state has been studied from the NMR dynamic parameters and it has also been found to be molecular-weight dependent.