Photopolymerizations of Methyl Methacrylate with N-Cetylpyridinium Bromide and N-Cetylpyridinium Chloride in Aqueous System

Abstract

ABSTRACT:The photopolymerizations of methyl methacrylate (MMA) with N-cetylpyridinium bromide (CPB) and N-cetylpyridinium chloride (CPC) were investigated in aqueous system. With CPB alone, photopolymerization did not proceed, but by the addition of a small quantity of CCI4 , it was significantly accelerated. The rate of the photopolymerization of MMA with CPB in the presence of CCl4 showed a linear relationship with the square root of CPB concentration, but was little affected by the concentration of CCI4 . With CPC MMA also photopolymerized in the presence of CCI4 , and especially at more than a critical micelle concentration (CMC) of CPC, the time-conversion curve showed a characteristic feature of emulsion polymerization, where Rp was proportional to the 0.75 power of the fed quantity of CPC, but almost independent of CCl4 concentration. The above photopolymerizations with CPB and CPC in the presence of CCl4 were, however, remarkably accelerated by the addition of KBr.KEY WORDS Photo-Emulsion Polymerization / Photo-Suspension Polymerization / Methyl Methacrylate / N-Cetylpyridinium Chloride / NCetylpyridinium Bromide / Carbon Tetrachloride /

Phase-Transfer Photopolymerization of Methyl Methacrylate with N-Cetylpyridinium Chloride-KSCN-CCl4 in an Aqueous-Organic Two-Phase System.

“…[3 ] In most cases, peroxydisulfate was used as a water-soluble initiator with a phasetransfer catalyst such as crown ethers or quaternary ammonium salts. During the course of our investigation on aqueous-organic two-phase polymerization, [4] we found that 1V cetylpyridinium chloride (CPC)-KSCN-CCl4 system induced photopolymen-zation of MMA in an aqueous system under an mild condition where N cetylpyridinium thiocyanate (CPT) acted as not only a phase-transfer catalyst but a photosensitizer and that the initiator system gave oligomer of MMA in the absence of CCl4. In this study the profiles of phase-transfer Photopolymerization of MMA with CPC-KSCN-CCl4 initiator system and photo-oligomerization of MMA with CPC-KSCN in the absence of CCl4 are discussed along with their kinetic features.…”

“…If CC14 was present in the system the oligo-MMA radical instantaneously reacted with CC14 and further polymerization will be induced to poly-MMA with high molecular weight. 4. Conclusion 1.…”