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End-groups in poly(methyl methacrylate) prepared using aroyl peroxides in the presence of 4-hydroxystilbene

✍ Scribed by C.A. Barson; J.C. Bevington; T.N. Huckerby; B.J. Hunt

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
252 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

4-Hydroxystilbene (HOS) is at 60 Β° about 300 times as reactive as methyl methacrylate (MMA) towards the benzoyloxy radical; the factor is even larger for the reactions with the 4-fluorobenzoyloxy radical. These conclusions have been reached from studies of the end-groups in samples of poly(MMA) prepared using the appropriate aroyl peroxides in the presence of HOS. Benzoyl peroxide labelled with tritium and carbon-14 was used to show that the presence of the derivative of stilbene increases the ratio of benzoate to phenyl end-groups. In the case of 4-fluorobenzoyl peroxide, 19F-NMR was used to compare the number of 4-fluorobenzoate groups attached to MMA units with the number joined to units derived from HOS.

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