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

✍ Scribed by A. S. Brar; Meenakshi Malhotra

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 254 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980118)67:3<417::aid-app4>3.0.co;2-p

✦ Synopsis

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, 1 H-and 13 C-NMR, 2D heteronuclear single quantum correlation ( HSQC ) , and homonuclear 1H -2D double quantum filter correlation spectroscopy ( DQF-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 r V Å 0.80 { 0.15 and r E Å 0.87 { 0.04. The microstructure was calculated in terms of the distribution of V-and Ecentered triad sequences from 13 C { 1 H } -NMR spectra of the copolymers. 2D HSQC was used to analyze the complex 1 H-NMR spectrum and 2D COSY shows the various bond interactions, thus inferring the possible structure of the copolymers.