Microstructural characterization of acrylonitrile/pentyl acrylate copolymers by one and 2-D NMR spectroscopy

✍ Scribed by A. S. Brar; Kaushik Dutta

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 312 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990301)37:5<533::aid-pola3>3.0.co;2-0

✦ Synopsis

Acrylonitrile/pentyl acrylate (A/P) copolymers of different monomer composition were prepared by solution polymerization using benzoyl peroxide as initiator.

Copolymer compositions were determined by elemental analysis and quantitative 13 C 1 H-NMR spectroscopy. The comonomer reactivity ratios, determined by both Kelen Tudos (KT) and nonlinear error in variables (EVM) methods are r A ϭ 0.75 and r p ϭ 0.45. 2-D heteronuclear correlation spectroscopy (HSQC) was used to simplify the complex 1 H spectra of A/P copolymers in terms of configurational and compositional sequences. The microstructure was obtained in terms of the distribution of A-and Pcentered triad sequences from 13 C 1 H-NMR spectra of the copolymers. The copolymerization mechanism was found to follow a first order Markov Model.