STUDIES ON THE MISCIBILITY OF POLY(2-HYDROXYETHYLMETHACRYLATE) AND HYDRODY PROPYL METHYL CELLULOSE BLENDS

Miscibility characteristics of poly[2–hydroxyethylmethacrylate] (PHEMA) and hydroxy propyl methyl cellulose (HPMC) have been investigated by solution viscometry, ultrasonic and differential scanning calorimetric (DSC) methods. The interaction parameters were obtained using the viscosity data. Ultrasonic velocity and adiabatic compressibilities versus blend composition have been plotted and are found to be linear. Variation of glass transition temperature (Tg) with composition follows the Gordon-Taylor equation. Tg values have also been calculated from the Fox equation. The results obtained reveal that PHEMA forms a miscible blend with HPMC over the entire composition range.