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Studies of end-groups in poly(methyl methacrylate) prepared using benzoyl peroxide in the presence of diphenylpropenes

✍ Scribed by C.A. Barson; J.C. Bevington; S.W. Breuer

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 285 KB
Volume: 25
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(89)90228-0

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✦ Synopsis

Benzoyl peroxide, labelled with carbon-14 and tritium, has been used to initiate polymerization of methyl methacrylate; the numbers of benzoate and phenyl end-groups have been compared. The presence of 1,3-diphenylpropene or 1,2-diphenylpropene at low concentration in the polymerizing system increases the proportion of benzoate end-groups because the additive is effective in capturing benzoyloxy radicals. The relative reactivities at 60'C of methyl methacrylate, 1,3-diphenylpropene and 1,2-diphenylpropene towards the benzoyloxy radical are approximately 1, 8 and 28. Very high reactivity of 9-(2-phenylethenyl)-anthracene towards this radical has been confirmed.

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