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Sequencing of N-vinyl-2-pyrrolidone/glycidyl methacrylate copolymers by one-dimensional and two-dimensional nuclear magnetic resonance spectroscopy



Copolymers of N-vinyl-2-pyrrolidone (V) and glycidyl methacrylate (G) monomers of different compositions were prepared by free-radical solution polymerization. The copolymer composition of these copolymers was determined with 1H-NMR spectra. The reactivity ratios calculated from the Kelen–Tudos and nonlinear least-square error-in-variable methods were rV = 0.03 ± 0.01 and rG = 5.05 ± 0.84 and rV = 0.02 and rG = 4.72, respectively. The triad sequence distribution in terms of V and G centered triads was determined from 13C{1H}-NMR spectroscopy. The complete spectral assignment of 13C{1H}- and 1H-NMR spectra was performed with the help of distortionless enhancement by polarization transfer and two-dimensional 13C–1H heteronuclear single quantum coherence. The 1H–1H couplings were explained with total correlation spectroscopy and nuclear Overhauser enhancement spectroscopy spectra. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 50–60, 2002; DOI 10.1002/app.10186