Abstract
Solution polymerization of methyl methacrylate (MMA) was carried out in the presence of visible light (440 nm) using β-picolinium p-chlorophenacylide as a photoinitiator at 30°C. The initiator and monomer exponent values were calculated to be 0·5 and 1·0 ± 0·01, respectively. An average value of k p 2 k t was 4·07 × 10 −2. The polymerization was retarded in the presence of hydroquinone; however, a nonpolar solvent (cyclohexane) enhanced the rate of polymerization. Kinetic data and ESR studies indicate that the overall polymerization takes place by a radical mechanism via triplet carbene formation which acts as a source of free radicals.
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