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Stereochemical and compositional assignments of trans ‐4‐methacryloyloxyazobenzene–methyl methacrylate copolymers by one‐ and two‐dimensional NMR spectroscopy
Author(s) -
Brar A. S.,
Thiyagarajan M.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19991220)74:13<3016::aid-app2>3.0.co;2-g
Subject(s) - comonomer , copolymer , triad (sociology) , heteronuclear molecule , nuclear magnetic resonance spectroscopy , reactivity (psychology) , spectroscopy , methacrylate , methyl methacrylate , polymer chemistry , polymerization , chemistry , nmr spectra database , materials science , two dimensional nuclear magnetic resonance spectroscopy , spectral line , physics , stereochemistry , organic chemistry , polymer , medicine , psychology , alternative medicine , pathology , quantum mechanics , astronomy , psychoanalysis
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 = 1.14 ± 0.08 and r M = 0.51 ± 0.03; r A = 1.13 ± 0.1 and r M = 0.50 ± 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. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 3016–3025, 1999