Kinetik der radikalischen polymerisation und copolymerisation von N-vinyl-N-methylacetamid

In order to get information on the kinetics of free radical polymerization of N-vinyl-N-methylacetamide (VIMA) polymerizations of the purified monomer were performed in dilatometers using the temperature range from 25 to 70°C, monomer concentrations of 10 to 100% in methanol, and initiation either by γY-irradiation or by radical initiators. Molecular weight meassurements of the polymer were calibrated by light scattering determinations of M_w according to the following equation at 30 °C in methanol: η]/(ml/g) = 5,02 · 10^?3 · M_w^0,7946. Normal kinetics of free radical polymerization were found to be valid and Arrhenius parameters were calculated for the ratio k_p²/k_t of the propagation rate constant k_p and the termination rate constant k_t as well as for the monomer transfer constant C_M and for the efficiency of initiation f. For copolymerizations of N-vinyl-N-methylacetamide with different comonomers the mean Q-e-values were calculated as follows: Q_VIMA ? 0,06; e_VIMA ? ? 1,8.