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6659887 
Journal Article 
Characterization of styrene/methacrylic acid copolymers by 2D-NMR spectroscopy 
Brar, AS; Hekmatyar, SK; , 
2001 
Yes 
Journal of Applied Polymer Science
ISSN: 0021-8995
EISSN: 1097-4628 
JOHN WILEY & SONS INC 
NEW YORK 
2444-2453 
WOS:000171143000013 
Styrene/methacrylic acid copolymers were prepared by free-radical photopolymerization using the uranyl nitrate ion as the initiator. The copolymer composition was determined from H-1-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 H-1-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. (C) 2001 John Wiley & Sons, Inc. 
IRIS
• Nitrate/Nitrite
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