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Chitosan-graft-poly(acrylic acid)/rice husk ash based superabsorbent hydrogel composite: preparation and characterization

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Abstract

Rice husk ash (RHA), an industrial waste, was incorporated in the preparation of high performance chitosan (CTS) and poly(acrylic acid) (PAA) based superabsorbent hydrogel. Hydrogels filled with RHA previously calcinated at 900 °C (RHA900) showed better water uptake (225 gwater/gabsorbent) than those with husk calcinated at 400 °C (RHA400) (198 gwater/gabsorbent) due to the higher purity and crystallinity, at same composition. The hydrogel composite at 5 wt-% of RHA900 showed the best water uptake (255 gwater/gabsorbent). A clear reduction in swelling degree is observed by increasing the amount of crosslinker from 1 to 3 wt-% due to the increase in the crosslinking density forming more rigid hydrogels. On the other hand, an increase in the initiator amount from 1 to 3 wt-% increased the water uptake due to the formation of greater numbers of active sites increasing the number of PAA chains grafted into CTS backbone. Furthermore, the hydrogel composites presented responsive behavior in relation to both pH and sat solution. The data shows it is possible to obtain high performance materials by incorporating an industrial waste, rice husk ash, in the preparation of hydrogel composites.

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Acknowledgments

The authors would like to thank the financial support by FUNCAP (BPI 0280-106/08 and PIL-139.01.00/09) and by CNPq (Proc. 507308/2010-7).

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Authors and Affiliations

  1. Coordenação de Química, Universidade Estadual Vale do Acaraú, Avenida da Universidade, 850, Campus da Betânia, 62040-370, Sobral, CE, Brazil

    Francisco H. A. Rodrigues

  2. Grupo de Materiais Poliméricos e Compósitos (GMPC) - Departamento de Química, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil

    Francisco H. A. Rodrigues, André R. Fajardo, Antonio G. B. Pereira & Edvani C. Muniz

  3. Departamento de Química Orgânica e Inorgânica, Campus do Pici, Universidade Federal do Ceará, 60455-760, Fortaleza, CE, Brazil

    Nágila M. P. S. Ricardo & Judith P. A. Feitosa

Authors
  1. Francisco H. A. Rodrigues
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  2. André R. Fajardo
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  3. Antonio G. B. Pereira
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  4. Nágila M. P. S. Ricardo
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  5. Judith P. A. Feitosa
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  6. Edvani C. Muniz
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Corresponding author

Correspondence to André R. Fajardo.

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Rodrigues, F.H.A., Fajardo, A.R., Pereira, A.G.B. et al. Chitosan-graft-poly(acrylic acid)/rice husk ash based superabsorbent hydrogel composite: preparation and characterization. J Polym Res 19, 1 (2012). https://doi.org/10.1007/s10965-012-0001-8

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  • DOI: https://doi.org/10.1007/s10965-012-0001-8

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