Abstract
The rate of polymerization at 60°C of methyl methacrylate initiated by benzoyl peroxide is almost unaffected by the presence of a small amount of 4-styrylpyridazine, 1-(2-pyridyl)-2-(4-pyridyl)ethylene or 2,6-distyrylpyridine. Examination of polymers made using peroxide suitably labeled with carbon-14 and tritium shows that these additives increase the ratio of benzcate to phenyl end-groups derived from the initiator. This effect arises because the additives are effective in capturing the benzoyloxy radical; in this respect, they are however considerably less reactive than the corresponding compounds containing groups derived from benzene in place of the nitrogen heterocycles.
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