Application of ftir in the determination of acrylate content in poly(sodium acrylate-co-acrylamide) superabsorbent hydrogels

Química Nova

Ricardo, Nágila M. P. S.¹  Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, Caicó, Brasil¹  Almeida Neto, Manuel P.¹  Feitosa, Judith P. A.¹  Magalhães, Antônio Sávio G.¹  Universidade Estadual do Ceará, Itapipoca, Brasil¹  Bezerra, Maslândia N.¹  Universidade Federal do Ceará, Fortaleza, Brasil¹ 

关键词: hydrogel;    sodium acrylate;    FTIR.;   

DOI  :  10.1590/S0100-40422012000700030

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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 (nCOO-) and 2940 cm-1 (nCH and nCH2). A straight line with a good linear correlation coefficient (0.998) was obtained by plotting the acrylate content (Ac%) versus relative absorbance (Arel = A1410/A2940). Results were confirmed by the amount of sodium cation released in acid medium determined by atomic absorption spectrometry.

【 授权许可】

Unknown