| Full text | |
| Author(s): |
Estrada Villegas, Gethzemani Mayeli
[1]
;
Rodrigues Morselli, Giovanni
[2]
;
Gonzalez-Perez, Giovanni
[2]
;
Benevolo Lugao, Ademar
[2]
Total Authors: 4
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Radiation Physics and Chemistry; v. 153, p. 44-50, DEC 2018. |
| Web of Science Citations: | 1 |
| Abstract | |
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) | |
| FAPESP's process: | 14/12931-1 - Superabsorbent wound dressing with silver nanoparticles formed in situ by gamma radiation: low-cost production |
| Grantee: | Gethzemani Mayeli Estrada Villegas |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |