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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/962

Title: Sequence determination of N-vinyl-2-pyrrolidone/acrylonitrile copolymers by NMR spectroscopy
Authors: Brar, Ajaib Singh
Rajeev Kumar
Keywords: N-vinyl-2-pyrrolidone/acrylonitrile copolymers
2D NMR studies
Sequence distribution
Issue Date: 2001
Citation: European Polymer Journal, 37(9), 1827-1835
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.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/962
Appears in Collections:Chemistry

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