Stereochemical and compositional assignments of trans-4-methacryloyloxyazobenzene–methyl methacrylate copolymers by one- and two-dimensional NMR spectroscopy

✍ Scribed by A. S. Brar; M. Thiyagarajan

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 278 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991220)74:13<3016::aid-app2>3.0.co;2-g

✦ Synopsis

The microstructure of trans-4-methacryloyloxyazobenzene-methyl methacrylate copolymers prepared by solution polymerization process using AIBN as initiator is analyzed by one-and two-dimensional spectroscopy. Sequence distribution was calculated from the 13 C( 1 H)-NMR spectra of the copolymers. Comonomer reactivity ratios were determined using the Kelen-Tudos and the nonlinear error-in-variables methods are r A ϭ 1.14 Ϯ 0.08 and r M ϭ 0.51 Ϯ 0.03; r A ϭ 1.13 Ϯ 0.1 and r M ϭ 0.50 Ϯ 0.04, respectively. The sequence distribution of A-and M-centered triads determined from 13 C( 1 H)-NMR spectra of copolymer is in good agreement with triad concentration calculated from a statistical model. The 2-D heteronuclear single-quantum correlation and correlated spectroscopy (TOCSY) was used to analyze the complex 1 H-NMR spectrum.