NMR studies of poly(2‐hydroxy ethyl methacrylate‐co‐2‐vinyl pyridine)

Abstract

Copolymers of 2-hydroxy ethyl methacrylate-2-vinyl pyridine (H/V) of different composition were synthesized by free radical bulk polymerization using azobisisobutyronitrile (AIBN) as an initiator under nitrogen atmosphere. The copolymer compositions were calculated from 1 H NMR spectra. The reactivity ratios for H/V copolymers obtained from a linear Kelen-Tudos method (KT) and nonlinear error-in-variables method (EVM) are r H 5 0.50 6 0.10, r V 5 1.04 6 0.08 and r H 5 0.55, r V 5 1.06 respectively. The complete spectral assignment of methine, methylene, methyl, carbonyl, and aromatic carbon regions in term of compositional and configurational sequences of H/V copolymers were done with the help of 13 C{ 1 H} NMR, distortionless enhancement by polarization transfer (DEPT), two-dimensional heteronuclear single quantum coherence (HSQC) along with total correlated spectroscopy (TOCSY).

Two-dimensional NMR studies of acrylate copolymers

“…The microstructure of a large number of copolymers such as methyl methacrylate/methyl acrylate (A/B) [61,62], 2-hydroxy ethyl methacrylate/2-vinyl pyridine [63], acrylonitrile/methyl methacrylate [59], and ethyl methacrylate/acrylonitrile [64] have been investigated by Brar et al Recently, they have assigned the complex carbon and proton NMR spectra of glycidyl methacrylate/vinyl acetate, methacrylonitrile/methyl methacrylate [65], N-vinyl-2-pyrrolidone/acrylonitrile, N-vinyl-2-pyrrolidone/methyl acrylate, glycidyl methacrylate/methyl styrene [66], and glycidyl methacrylate/butyl acrylate [67] in terms of compositional and configurational sequences with the help of DEPT, HSQC, TOCSY, and NOESY NMR experiments. They have also assigned the complex 1 H, 13 C{ 1 H} NMR spectra of a large number of copolymers such as styrene/n-butyl acrylate [68], styrene/methyl methacrylate [69], N-acryloylcarbazole/methyl methacrylate [70], N-acryloyl carbazole/methacrylonitrile [71], and acrylonitrile/methyl acrylate [72] with the help of DEPT, HSQC, TOCSY, and HMBC experiments.…”