US EPA

9104983 

Journal Article 

Microstructure of vinylidene chloride ethyl acrylate copolymers by one- and two-dimensional NMR spectroscopy 

Brar, AS; Malhotra, M 

1998 

Yes 

Journal of Applied Polymer Science
ISSN: 0021-8995
EISSN: 1097-4628 

67 

3 

417-426 

English 

10.1002/(SICI)1097-4628(19980118)67:3<417::AID-APP4>3.0.CO;2-P 

WOS:A1998YL15100004 

Vinylidene chloride/ethyl acrylate (V/E) copolymers were prepared by photopolymerization using uranyl ion as a photosensitizer at room temperature. Copolymers were characterized by chlorine estimation, gel permeation chromatography. 1H- and 13C-NMR, 2D heteronuclear single quantum correlation (HSQC), and homonuclear 1H-2D double quantum filter correlation spectroscopy (DQP-COSY). Reactivity ratios for the copolymerization of V with E were calculated using the Kelen-Tudos (KT) and the nonlinear error in variables (EVM) methods. The reactivity ratios obtained from the EVM methods are rv = 0.80 ± 0.15 and rE = 0.87 ± 0.04. The microstructure was calculated in terms of the distribution of V- and E-centered triad sequences from 13C{1H}-NMR spectra of the copolymers. 2D HSQC was used to analyze the complex 1H-NMR spectrum and 2D COSY shows the various bond interactions, thus inferring the possible structure of the copolymers. © 1998 John Wiley & Sons, Inc.