期刊
QUIMICA NOVA
卷 35, 期 7, 页码 1464-1467出版社
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422012000700030
关键词
hydrogel; sodium acrylate; FTIR
资金
- CT-Hidro
- CNPq
- FUNCAP
- INCT-INOMAT
Hydrogels have been prepared by free-radical solution copolymerization of acrylamide and sodium acrylate (NaAc), with molar ratio ranging from 25/75 to 80/20, respectively, using methylene bisacrylamide as the crosslinking agent. A FTIR spectroscopy procedure to determine the acrylate/acrylamide ratio in these hydrogels was proposed based on absorbance at 1410 cm(-1) (nu COO-) and 2940 cm(-1) (nu CH and nu CH2). A straight line with a good linear correlation coefficient (0.998) was obtained by plotting the acrylate content (Ac%) versus relative absorbance (A(rel) = A(1410)/A(2940)). Results were confirmed by the amount of sodium cation released in acid medium determined by atomic absorption spectrometry.
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