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Water‐soluble copolymers. V. Compositional determination of random copolymers of acrylamide with sulfonated comonomers by infrared spectroscopy and C 13 nuclear magnetic resonance
Author(s) -
McCormick Charles L.,
Chen GowSheng,
Hutchinson Brewer H.
Publication year - 1982
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.1982.070270832
Subject(s) - copolymer , acrylamide , infrared spectroscopy , absorbance , infrared , polymer chemistry , materials science , spectroscopy , fourier transform infrared spectroscopy , sulfonate , nuclear magnetic resonance spectroscopy , carbon 13 nmr , methacrylate , analytical chemistry (journal) , sodium , chemistry , polymer , organic chemistry , chemical engineering , chromatography , physics , quantum mechanics , optics , composite material , metallurgy , engineering
Compositional analyses of random copolymers of acrylamide with sodium‐2‐sulfoethyl methacrylate and with sodium‐2‐acrylamido‐2‐methylpropane sulfonate have been performed utilizing elemental analysis, infrared spectroscopy, and C 13 NMR. A mathematical method involving nitrogen to sulfur ratios has been developed to eliminate errors which often arise from associated water in hydrophilic copolymers. The ratios of infrared absorbances at 1043 cm −1 and 1664 cm −1 were used to determine the composition of AM—NaAMPS copolymers; likewise, absorbance ratios at 1040 cm −1 and 3200 cm −1 were utilized for determination of the AM—NaSEM copolymer composition. Carbon‐13 NMR spectra of the copolymers were also obtained, and characteristic peaks were utilized to quantitate copolyer composition. The results obtained by elemental analyses, infrared spectroscopic studies, and NMR were in excellent agreement. These techniques are of great value for determining composition of hygroscopic copolymers which can crosslink or form strong intramolecular hydrogen bonds, often precluding further characterization.