Artículo
Thermoresponsive hydrogels based on alginate-g-poly(N-isopropylacrylamide) copolymers obtained by low dosis of gamma radiation
Lencina, María Malvina Soledad
; Ciolino, Andrés Eduardo
; Andreucetti, Noemi Amalia; Villar, Marcelo Armando
Fecha de publicación:
17/04/2015
Editorial:
Elsevier
Revista:
European Polymer Journal
ISSN:
0014-3057
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Low doses of gamma radiation from 60Co have been used in the synthesis of water soluble alginate-g-poly(N-isopropylacrylamide) (PNIPAAm) copolymers. Irradiation was carried out using glass vials containing aqueous solutions of alginate and NIPAAm monomers. The resulting copolymers have been characterized by different characterization techniques such as Fourier transform infrared spectra, 1H Nuclear Magnetic Resonance, elemental analysis and thermogravimetric analysis. NIPAAm concentration in the initial reaction mixture and irradiation dose evidenced a direct effect on the grafting percentage; an increasing in NIPAAm concentration in the initial reaction mixture always led to a higher content of grafted PNIPAAm in the copolymers. On the other hand, for a fixed NIPAAm concentration in the reaction mixture, the amount of PNIPAAm in the copolymer increased with the dose. Copolymers were used in hydrogels formation by cross-linking alginate carboxylic groups with Ca2+and swelling properties of the new materials were studied at 24 °C and 37 °C. Hydrogels presented thermo-sensitivity, showing lower swelling ratios at 37 °C. Hydrogel water uptake was hindered as a consequence of the collapsed state of PNIPAAm moieties in the copolymers.
Palabras clave:
Alginate
,
Pnipaam
,
Low-Doses Radiation
,
Thermosensitive Hydrogels
Archivos asociados
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Identificadores
Colecciones
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Lencina, María Malvina Soledad; Ciolino, Andrés Eduardo; Andreucetti, Noemi Amalia; Villar, Marcelo Armando; Thermoresponsive hydrogels based on alginate-g-poly(N-isopropylacrylamide) copolymers obtained by low dosis of gamma radiation; Elsevier; European Polymer Journal; 68; 17-4-2015; 641-649
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