Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Different Surface-Charged Lamellar Materials on Swelling Properties of Nanocomposite Hydrogels

Full text
Author(s):
Pfeifer, Marcela [1] ; Andrade, Flavio A. C. [2, 1] ; Bortoletto-Santos, Ricardo [2, 3] ; Aouada, Fauze A. [4] ; Ribeiro, Caue [2]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Carlos, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Embrapa Instrumentacao, Lab Nacl Nanotecnol Agronegocio LNNA, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ Estadual Paulista Julio de Mesquita Filho UN, Inst Quim, Ave Prof Francisco Degni 55, BR-14800900 Araraquara, SP - Brazil
[4] Univ Estadual Paulista Julio de Mesquita Filho UN, Ave Brasil 56, BR-15385000 Centro, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 29, n. 10, p. 3311-3323, OCT 2021.
Web of Science Citations: 0
Abstract

This study investigated the effect of different surface-charged lamellar materials on the swelling and diffusion properties of synthesized polyacrylamide-methylcellulose hydrogels (HG). Montmorillonite and thermally activated hydrotalcite (300 degrees C and 550 degrees 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 degrees 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 affected 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 degrees 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 degrees 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. (AU)

FAPESP's process: 19/18036-8 - Development of nanocomposite coatings based on polyurethane modified with exholled argilominerals for application in the control of slow release of soluble fertilizers
Grantee:Marcela Pfeifer
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
Grantee:Roberto de Campos Giordano
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 20/03259-9 - Development of a new kind of biodegradable polymer nanocomposes for application as coating in the slow and controlled release of soluble fertilizers
Grantee:Ricardo Bortoletto Santos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/03643-0 - Study of novel biodegradable carrier vehicles of fertilizers and agricultural defensives based on hydrogel and nanostructure silicates as an alternative in the combat of environmental impacts
Grantee:Fauze Ahmad Aouada
Support type: Regular Research Grants