Polymerization of methyl methacrylate with a benzoic anhydride/pyridine N‐oxide system. Vinyl polymerization. 122<sup>1</sup>

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<jats:title>Abstract</jats:title><jats:p>The polymerization of methyl methacrylate was carried out in benzene, using benzoic anhydride/pyridine N‐oxide system as initiator. As well as the results obtained in the case of benzoic anhydride/dimethylaniline N‐oxide system, it was found that the rate of polymerization was proportional to the square roots of the initial concentrations of benzoic anhydride and pyridine N‐oxide respectively, that the polymerization was remarkably accelerated in the presence of alcohols, and that hydroquinone inhibited the polymerization. From these results together with the observation on the composition curve of the copolymerization of methyl methacrylate with styrene, it was concluded that the system could initiate radical polymerization. The mechanism as for the radical formation was briefly discussed.</jats:p>

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