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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhancement swelling properties of PVGA hydrogel by alternative radiation crosslinking route

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Estrada Villegas, Gethzemani Mayeli [1] ; Rodrigues Morselli, Giovanni [2] ; Gonzalez-Perez, Giovanni [2] ; Benevolo Lugao, Ademar [2]
Total Authors: 4
[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

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