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 H-1-NMR spectra. The reactivity ratios calculated from the Kelen-Tudos and nonlinear least-square error-in-variable methods were r(V) = 0.03 +/- 0.01 and r(G) = 5.05 +/- 0.84 and r(V) = 0.02 and r(G) = 4.72, respectively. The triad sequence distribution in terms of V and G centered triads was determined from C-13(H-1)-NMR spectroscopy. The complete spectral assignment of C-13{H-1}- and H-1-NMR spectra was performed with the help of distortionless enhancement by polarization transfer and two-dimensional C-13-H-1 heteronuclear single quantum coherence. The H-1-H-1 couplings were explained with total correlation spectroscopy and nuclear Overhauser enhancement spectroscopy spectra. (C) 2002 John Wiley Sons, Inc.