Polymerization of methylmethacrylate with cetyl pyridinium bromide (CPB)-benzoyl peroxide (BZ2O2) combination as a redox initiator and with CPB as a lone photoinitiator

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Abstract

Polymerization of MMA was carried out in near-bulk and in fairly dilute solutions in DMF at 40° with (1) CPB-BZ2O2 combination as the redox initiator in the dark and (2) CPB as the sole photoinitiator in visible light. Rp was proportional to ([CPB] [BZ2O2])0.18 for the redox polymerization and to [CPB]0.35 for the photopolymerization both in near-bulk (10% DMF, v/v) and in high dilution (50% DMF, v/v). Polymerization was inhibited by hydroquinone in each case indicating a radical mechanism. Effect of several solvents/additives on the polymerization revealed that dimethyl formamide, acetonitrile and pyridine acted as rate enhancing solvents in the redox polymerization while in the photopolymerization they acted as normal diluents; benzene, methanol, acetone and chloroform exhibited inert nature while formamide and acetamide behaved as retarding additives in both types of polymerization. Initiator transfer of the degradative type reasonably explains kinetic nonidealities.

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