Kubota, N.; Kajiwara, A.; Zetterlund, P. B.; Kamachi, M.; Treurnicht, J.; Tonge, M. P.; Gilbert, R. G.; Yamada, B.
Determination of the Propagation Rate Coefficient of Vinyl Pivalate Based on EPR Quantification of the Propagating Radical Concentration
Macromolecular Chemistry and Physics 2007, 208, 2403.
 

The propagation rate coefficient (k_p) of the vinyl pivalate (VPi) has been determined from an EPR quantification of the concentration of propagating radicals. The polymerizations followed first-order kinetics with respect to the monomer, and the concentration of propagating radicals did not vary with time. The chain lengths were estimated to be sufficiently large to not affect k_p. The resulting Arrhenius parameters for k_p of VPi in heptane are A_p = 1.39 × 10⁷ dm³ · mol^-1 · s^-1 and E_p = 20.5 kJ · mol^-1. They are very similar to those of vinyl acetate as previously determined by the PLP method. The present results thus indicate that EPR gives consistent k_p values for vinyl esters.