Homopolymers of N-vinylpyrrolidone (VP) and vinyl acetate (VAc) were synthesized by a free-radical solution polymerization technique. Copolymers of VP and VAc in various monomer feed ratios were also synthesized by the same procedure. They were characterized by elemental analysis, FTIR, PNMR, TGA, swelling, and viscosity measurements. The reactivity ratios of the monomers were computed by both Fineman-Ross and Kelen-Tudos methods using data from both PNMR and elemental analysis studies. The activation energy values for various stages of decomposition were calculated from TGA analysis using Broido＇s method. The viscosity measurements were carried out at four different temperatures : 30, 35, 40, and 45 degrees C. The activation parameters of the viscous how, voluminosity (V-E), and shape factor (v) were also computed for all systems.