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A spin-trap study of the benzoyl peroxide initiated radical copolymerization of styrene and vinyl acetate

✍ Scribed by Jeremy Lane; Brian J. Tabner

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
291 KB
Volume
27
Category
Article
ISSN
0014-3057

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✦ Synopsis

Electron spin resonance spectroscopy has been used, in conjunction with the spin-trapping technique (employing 2-methyl-2-nitrosopropane), to identify (and distinguish between) polystyrene and poly(vinyl acetate) propagating radicals. The technique has also been used to establish the relative concentrations of propagating radicals with a styrene or a vinyl acetate ultimate monomer unit at the radical end of the propagating chain in a range of styrene/vinyl acetate copolymerizations. From the data the monomer reactivity ratios have been estimated to be r s = 57 + 7 and rvA = 0.002 + 0.004.

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