| Texto completo | |
| Autor(es): |
Estrada Villegas, Gethzemani Mayeli
[1]
;
Rodrigues Morselli, Giovanni
[2]
;
Gonzalez-Perez, Giovanni
[2]
;
Benevolo Lugao, Ademar
[2]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] CONACyT Ctr Invest Quim Aplicada, Av Alianza Sur 204 Parque Innovac & Invest Tecnol, Apodaca 66629, Nuevo Leon - Mexico
[2] Inst Pesquisas Energet & Nucl, CNEN, Ctr Quim & Meio Ambiente, Av Prof Lineu Prestes, 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Radiation Physics and Chemistry; v. 153, p. 44-50, DEC 2018. |
| Citações Web of Science: | 1 |
| Resumo | |
The development of environmentally friendly materials based on non-toxic absorbent polymers, which can ensure high water absorption for several applications in biomedical or agricultural areas, is one of the most complexes problems. In the literature, the non-toxic biodegradable polymer poly(vinyl alcohol) (PVA) was chemically modified with glyoxylic acid to obtain poly(vinylglyoxylic acid) (PVGA) as a biodegradable super absorbent hydrogel polymer (SHAP), but in fact, the chemical crosslinking reaction decreases the water absorption capacity. In order to crosslink PVGA without losing its absorbent capacity; an alternative radiation-crosslink route has been studied. Radiation-induced crosslinking in the main C-C chain of PVGA where not all free hydrophilic groups (COOH) are involved in a crosslinking reaction as occurs in a traditional chemical reaction. The aim of this work was not only the chemical modification of 99% hydrolyzed PVA to obtain the linear and non-crosslinked PVGA at certain conditions, but also radiation crosslinking at different doses, at dose rate of 5 kGy h(-1) attempting to increase the superabsorbent capacity. The samples were characterized by Scanning Electron Microscopy (SEM), Thermo-gravimetrical Analysis (TGA), Nuclear Magnetic Resonance (1H) (NMR) and Infrared Spectroscopy (FTIR). The swelling behavior was measured gravimetrically in different solvents as pure water, buffer pH 3, 7 and 10. Results showed that radiation-crosslink route improves the swelling behavior of PVGA in approximately 215% when compared with PVGA chemically crosslinked, swelled in pure water. (AU) | |
| Processo FAPESP: | 14/12931-1 - Curativo superabsorvente com nanopartículas de prata formadas in situ por radiação gama: produção de baixo custo |
| Beneficiário: | Gethzemani Mayeli Estrada Villegas |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |