PHOTOPOLYMERIZATIONS OF METHYL-METHACRYLATE WITH N-CETYLPYRIDINIUM BROMIDE AND N-CETYLPYRIDINIUM CHLORIDE IN AQUEOUS SYSTEM

The photopolymerizations of methyl methacrylate (MMA) with N-cetylpyri dinium bromide (CPB) and N-cetylpyridinium chloride (CPC) were investi gated in aqueous system. With CPB alone, photopolymerization did not p roceed, but by the addition of a small quantity of CCl4, it was signif icantly accelerated. The rate of the photopolymerization of MMA with C PB in the presence of CCl4 showed a linear relationship with the squar e root of CPB concentration, but was little affected by the concentrat ion of CCl4. With CPC MMA also photopolymerized in the presence of CCl 4, and especially at more than a critical micelle concentration (CMC) of CPC, the time-conversion curve showed a characteristic feature of e mulsion polymerization, where R(p) was proportional to the 0.75 power of the fed quantity of CPC, but almost independent of CCl4 concentrati on. The above photopolymerizations with CPB and CPC in the presence of CCl4 were, however, remarkably accelerated by the addition of KBr.