| 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 Opportunities: | 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 Opportunities: | 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | 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 Opportunities: | Regular Research Grants |