Synthesis and characterization of chitosan-graft-poly(acrylic acid)/nontronite hydrogel composites based on a design of experiments

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[1] [1,Rodrigues, Francisco H.A.
[2] Pereira, Antonio G. B.
[3] Fajardo, André R.
[4] Muniz, Edvani C.
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Rodrigues, F.H.A. (almeida_quimica@yahoo.com.br) | 1600年 / John Wiley and Sons Inc卷 / 128期
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A 24-1 fractional factorial design was used to evaluate the effect of some parameters; such as the acrylic acid (AA)/chitosan (CTS) molar ratio; crosslinker concentration; initiator concentration; and filler concentration; in the swelling capacity of superabsorbent hydrogel composites based on CTS-graft-poly(acrylic acid) and nontronite clay. The data from wide-angle X-ray scattering and Fourier transform infrared spectroscopy confirmed the syntheses of the hydrogel composites. Main and interaction effects were analyzed by analysis of variance; F tests; and p values. We found that the AA/CTS and crosslinker were the most influential effects in the evaluated response. The proposed statistical model presented a high coefficient of determination (R2 = 0.985). In addition to the swelling kinetics; the effects of pH and salt for the both compositions (with and without filler); which presented the best water uptake; were evaluated. Both hydrogels showed responsive behavior in relation to the pH and the salt solution; presenting good potential for application as devices in the controlled release of solutes. © 2012 Wiley Periodicals; Inc;
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