Data/hora: 03/06/2024 00:03:20

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 22/06/2021
Data da última atualização: | 10/06/2022
Autoria: | PFEIFER, M.; ANDRADE, F. A. C.; BORTOLLETTO-SANTOS, R.; AOUADA, F. A.; RIBEIRO, C.
Afiliação: | CAUE RIBEIRO DE OLIVEIRA, CNPDIA.
Título: | Efect of diferent surface?charged lamellar materials on swelling properties of nanocomposite hydrogels.
Ano de publicação: | 2021
Fonte/Imprenta: | Journal of Polymers and the Environment, v. 29, 2021.
Páginas: | 3311?3323
DOI: | https://doi.org/10.1007/s10924-021-02120-7
Idioma: | Inglês
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
Palavras-Chave: | Hydrogel; Swelling degree.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (17800-1) - UPC - AP - DD - PROCI.21/56 -  - 2021/56 - DIS