Open AccessOne‐ and two‐dimensional NMR characterization of N ‐vinyl‐2‐pyrrolidone/methyl acrylate copolymers
Author(s) -
Brar A. S.,
Kumar Rajeev
Publication year - 2002
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/pola.1336
Subject(s) - copolymer , homonuclear molecule , polymer chemistry , reactivity (psychology) , methyl acrylate , chemistry , nmr spectra database , heteronuclear molecule , acrylate , proton nmr , radical polymerization , polymerization , nuclear magnetic resonance spectroscopy , spectral line , molecule , polymer , organic chemistry , medicine , physics , alternative medicine , pathology , astronomy
N ‐vinyl‐2‐pyrrolidone/methyl acrylate (V/M) copolymers were prepared by free‐radical bulk polymerization using benzoyl peroxide as an initiator. The copolymer composition of these copolymers was calculated from 1 H NMR spectra. The radical reactivity ratios for N ‐vinyl‐2‐pyrrolidone (V) and methyl acrylate (M) were r V = 0.09, r M = 0.44. These reactivity ratios for the copolymerization of V and M were determined using the Kelen–Tudos and nonlinear least‐squares error‐in‐variable methods. The 13 C{ 1 H} and 1 H NMR spectra of these copolymers overlapped and were complex. The complete spectral assignment of the 13 C and 1 H NMR spectra were done with distortionless enhancement by polarization transfer and two dimensional 13 C‐ 1 H heteronuclear single quantum correlation spectroscopic experiments. The two‐dimensional 1 H‐ 1 H homonuclear total correlation spectroscopic NMR spectrum showed the various bond interactions, thus inferring the possible structure of the copolymers. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 2225–2236, 2002