Abstract
p-Chlorostyrene, styrene and p-methylstyrene were polymerized in ethylene chloride by sulfuric acid at 30°C. In the homo-polymerization, all the monomers showed largeinitial rates and saturated conversion. Therefore, the rate constants of the propagation reaction were calculated by the kinetic treatment for non-steady state. The rate constants of the cross-propagation reaction were calculated from the propagation rate constants and the monomer reactivity ratios in the copolymerization. These results showed that a more reactive monomer produced a more reactive growing carbonium ion even in the polymerization catalyzed by sulfuric acid which is more acidic than iodine.
