Enhancement swelling properties of PVGA hydrogel by alternative radiation crosslinking route
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Radiation Physics and Chemistry
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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 superabsorbent
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 radiationcrosslink
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.
Como referenciar
VILLEGAS, GETHZEMANI M.E.; MORSELLI, GIOVANNI R.; GONZALEZ-PEREZ, GIOVANNI; LUGAO, ADEMAR B. Enhancement swelling properties of PVGA hydrogel by alternative radiation crosslinking route. Radiation Physics and Chemistry, v. 153, p. 44-50, 2018. DOI: 10.1016/j.radphyschem.2018.08.038. Disponível em: http://repositorio.ipen.br/handle/123456789/29353. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.