Title: Sequence determination of N-vinyl-2-pyrrolidone/acrylonitrile copolymers by NMR spectroscopy
Abstract: N-vinyl-2-pyrrolidone/acrylonitrile (V/A) copolymers of different compositions were prepared by free radical solution polymerization in DMF using benzoyl peroxide as an initiator. The composition of the copolymers was determined by using quantitative 13C{1H}-NMR spectra. The methine carbon of V- and A-centered resonances were used for the determination of the sequence distribution of V- and A-centered triads. The sequence distribution of V- and A-centered triads determined from 13C{1H}-NMR spectra of the copolymers are in good agreement with the triad concentration calculated from the Alfrey–Mayo statistical model. The comonomer reactivity ratios, determined by both the Kelen-Tudos and the non-linear error in variable methods are rV=0.06±0.005, rA=0.46±0.019; rV=0.06 and rA=0.46 respectively. Two-dimensional 1H–13C-heteronuclear single quantum correlation spectroscopy was used to assign the aliphatic protons in the 1H-NMR spectrum. Total correlated spectroscopy was used to assign the various 1H–1H coupling in the copolymers.
Publication Year: 2001
Publication Date: 2001-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 14
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