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1 Radiation Chemistry Department, National Center for Radiation Research and Technology, B.O. Box 29 Nasr City, Atomic Energy Authority, Cairo Egypt 2 Chemistry Department, College for Girls, Ain Shams University, Cairo, Egypt Abstract Poly(vinyl alcohol)/ methyl cellulose (PVA/MC) blends, at different ratios were prepared into films by solution casting using, water as a common solvent, and gamma irradiated at various doses. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were used to study the thermal properties of gamma irradiated PVA/MC blends. It is expected that these methods would enable to understand the effect of gamma irradiation on the mechanism of thermal decomposition. The kinetic parameters such as energy of activation (Ea) and regression r 2 for the thermal decomposition were determined by three different methods. In the present work, the Coats-Redfern, Broido and Horowitz-Metzger methods were applied. The results indicated that the Ea and r 2 values of the gamma irradiated PVA/MC blends as determined by the three methods were comparable.

Kinetic studies on the thermal decomposition of gamma-irradiated poly(vinyl alcohol (PVA)/methyl cellulose (MC) blends