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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/06/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PFEIFER, M.; ANDRADE, F. A. C.; BORTOLLETTO-SANTOS, R.; AOUADA, F. A.; RIBEIRO, C. |
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Afiliação: |
CAUE RIBEIRO DE OLIVEIRA, CNPDIA. |
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Título: |
Effect of different surface?charged lamellar materials on swelling properties of nanocomposite hydrogels. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Journal of Polymers and the Environment, v. 29, 2021. |
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Páginas: |
3311?3323 |
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DOI: |
https://doi.org/10.1007/s10924-021-02120-7 |
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Idioma: |
Inglês |
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Conteúdo: |
This study investigated the efect of diferent surface-charged lamellar materials on the swelling and difusion properties of synthesized polyacrylamide-methylcellulose hydrogels (HG). Montmorillonite and thermally activated hydrotalcite (300 °C and 550 °C) were incorporated during the preparation of nanocomposite (NC) hydrogels. A series of NC hydrogels were prepared by varying the lamellar material content (1:1, 2:1 and 4:1). The results showed that the HG with hydrotalcite (550 °C) was strongly dependent on the ionic intensity, and that the swelling degree increased by 50%, 65% and 78% with reducing the hydrotalcite content at (1:1), (2:1) and (4:1), respectively. The water absorption capacity of HG containing montmorillonite or hydrotalcite (300 ºC) was slightly afected when the pH was decreased from 7 to 3. However, the pH variation from 7 to 10 increased the water absorption capacity of most HG, except those containing hydrotalcite (550 °C) at (2:1) and (4:1). The presence of lamellar nanoparticles in hydrogels made the polymer matrix more rigid, and less likely to absorb water. In contrast, HG with hydrotalcite (550 °C) at (2:1) and (4:1) showed anomalous behavior with an increase in their water absorption capacity. The results support that the developed NC-HG can be suitable candidate materials for controlled released applications |
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Palavras-Chave: |
Hydrogel; Swelling degree. |
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Categoria do assunto: |
-- |
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Marc: |
null
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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| 1. |  | MAIA, L. C. da; SOUZA, V. Q. de; KOPP, M. M.; CARVALHO, F. I. F. de F; OLIVEIRA, A. C. Tandem repeat distribution of gene transcripts in three plant families. Genetics and Molecular Biology, Ribeirão Preto, v. 32, n. 4, p. 822-833, 2009.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
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