Resumen

GONZALEZ, Nain; EL-HALAH, Amai; CONTRERAS, Jesús M.  y  GASCUE, Blanca Rojas de. Study of the absorption capacity in semi-interpenetrating hydrogels of polyacrylamide/poly(hydro xybutyrate-co-hydroxy valerate). Rev.Colomb.Quim. [online]. 2018, vol.47, n.3, pp.5-12. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v47n3.69280.

Semi-interpenetrated hydrogels (semi-IPN) obtained from acrylamide (AAm) and the biopolymer poly(hydroxybutyrate-co-hydroxyvalerate) (P(HB-co-HV)) of different molar mass (Mv) were synthesized. Chemical structure of the synthesized materials was analyzed by using FT-IR spectroscopy. The results suggested the incorporation of P(HB-co-HV) within the cross-linked network of the Polyacrylamide (PAAm), which indicated that the semi-IPN hydrogel was synthesized. To confirm this result, semi-IPN dry gel samples were analyzed by differential scanning calorimetry. The swelling behavior of the hydrogels in water was followed gravimetrically and the effect of the percentage composition and percentage of crosslinking reagent (N,N'-methylenebisacrylamide, MBAAm) on the water transport mechanisms was analyzed. Results indicated that the semi-IPN hydrogels swell less than the PAAm hydrogel alone, which was attributed to the hydrophobic nature of the biopolymer incorporated within the crosslinked network of the material. Additionally, the diffusion exponent of the hydrogels (n) was calculated and in all cases, the obtained result was n < 0.50. This fact shows that the diffusion process is less Fickian, which means that the speed of water penetration is lower than the speed of relaxation of the polymer chain.

Palabras clave : interpenetrated networks; hydrolysis; biopolymer; kinetic.

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