N-methyl N-vinyl acetamide (NMNVA) monomer was polymerized at low conversions and its free radical kinetics were detailed using capillary dilatometry. The polymerizations were conducted isothermally, at 40 degreesC using 2,2'-azobis[2-(2-imidazolin-2-yl) propane dihydrochloride] (ABDH) as initiator. Monomer concentration and initiator concentration ranges were 1.10-1.70 mol.L-1 and 1-4 mmol.L-1, respectively. The aqueous polymerization media were kept at neutral pH. The rates of polymerization (R-p) and orders of reaction with respect to NMNVA and ABDH concentrations were evaluated and the kinetic expression was found to be ideal, with R-p proportional to [NMNVA](1.07) [ABDH](0.61). The polymers obtained were characterized by their viscosity numbers and correlation of viscosity average molecular weights was made with the amount of ABDH initiator.