Hydrogels composite of poly(acrylamide‐co‐acrylate) and rice husk ash. I. Synthesis and characterization |
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| Authors: | Jean de S Cândido Renan C F Leitão Nágila M P S Ricardo Judith P A Feitosa Edvani C Muniz Francisco H A Rodrigues |
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| Affiliation: | 1. Coordena??o de Química, Universidade Estadual Vale do Acaraú, Avenida da Universidade, 850 Campus da Betania, 62040‐370 Sobral‐CE, Brazil;2. Departamento de Química Organica e Inorganica, Campus do Pici, Universidade Federal do Ceará, CEP 60455‐760 Fortaleza‐CE, Brazil;3. Departamento de Química, Universidade Estadual de Maringá, Av. Colombo 5790, 87020‐900 Maringá‐PR, Brazil |
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| Abstract: | Composite hydrogels of poly(acrylamide‐co‐acrylate) with rice husk ash (RHA) were synthesized and studies of the swelling variables were accomplished comparatively with commercial polyacrylamide gel and PAMACRYL, a poly(acrylamide‐co‐acrylate) hydrogel without RHA. FT‐IR and WAXS were the techniques employed for characterizing a series of hydrogel obtained by varying the percentage of RHA (1, 2, 5, 10, and 20 wt %) and the amount of crosslinking agent (0.05, 0.1, and 0.2 mol %) relative to sum of AAm and AAc. Superabsorbent hydrogel with Weq > 800 g H2O/g gel was obtained with percentage of 10 wt % of RHA and 0.1 of crosslinking agent mol %. The hydrogel showed to be sensitive to the pH variation and to the presence of salts. The hydrogels, even though submitted through cycles of drying and swelling, preserved their superabsorbent characteristics and demonstrated better water absorbance properties when compared with commercial polyacrylamide gel. The composite hydrogels of poly(acrylamide‐co‐acrylate) with RHA presented good characteristics to be applied as soil conditioner for using in agriculture. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
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| Keywords: | hydrogels composites hydrophilic polymers swelling |
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