Data/hora: 21/06/2024 08:34:00

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: 	Effect of different 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