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Characterization of styrene/methacrylic acid copolymers by 2D‐NMR spectroscopy
Author(s) -
Brar A. S.,
Hekmatyar S. K.
Publication year - 2001
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/app.2095
Subject(s) - copolymer , comonomer , styrene , methacrylic acid , reactivity (psychology) , polymer chemistry , geminal , nuclear magnetic resonance spectroscopy , materials science , spectroscopy , chemistry , organic chemistry , physics , polymer , medicine , alternative medicine , pathology , quantum mechanics
Abstract Styrene/methacrylic acid copolymers were prepared by free‐radical photopolymerization using the uranyl nitrate ion as the initiator. The copolymer composition was determined from 1 H‐NMR spectroscopy. The comonomer reactivity ratios determined using Kelen Tudos and nonlinear error in variable methods (EVM) are r m = 0.61 ± 0.05 and r s = 0.14± 0.07. The broad and overlapping 1 H‐NMR spectrum was assigned using the help of 2D TOCSY and NOESY experiments. These methods were used to ascertain the various geminal, vicinal, and spatial couplings between the protons. The methyl and methine protons also show configurational and compositional sensitivity. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2444–2453, 2001