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A high-field 13C-NMR study of the aqueous copolymerizations of acrylonitrile and vinyl acetate. Determination of comonomer reactivity ratios.

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>1994
<mark>Journal</mark>European Polymer Journal
Issue number5
Number of pages7
Pages (from-to)581-587
<mark>Original language</mark>English


The radical initiated aqueous “slurry” copolymerization of acrylonitrile and vinyl acetate has been investigated. High field 13C-NMR spectra have been recorded for samples prepared employing both batch and starve-fed (semi-continuous) techniques. Copolymer composition and A-centred triad fractions have been obtained from the NMR spectra for a range of different feed compositions and give terminal model reactivity ratios of rV and rA of 2.7 and 0.05, respectively. However, the penultimate model gives a superior fit to the experimental A-centred triad fraction data. A comparison is made with data obtained for the same system employing the spin-trapping technique in conjunction with ESR spectroscopy.