Abstract

Mohammad Sadeghi¹* and Mojgan Yarahmadi²  

Novel biopolymer-based superabsorbent hydrogels were prepared by grafting crosslinked poly(NVP-co-AMPS) chains onto CMC backbones through a free radical polymerization method. A proposed mechanism for superabsorbent hydrogel formation was suggested and the hydrogel structure was confirmed using FTIR spectroscopy. The morphology of the samples was examined by scanning electron microscopy (SEM). The effect of concentration of MBA as well as NVP/AMPS weight ratio on swelling capacity of hydrogel was also studied. Furthermore, the water absorbency of hydrogels was measured in solutions with pH ranged 1 to 13. The CMC-based hydrogel exhibited a pH-responsiveness character so that a swelling-deswelling pulsatile behavior was recorded at pHs 2 and 8. Additionally, the hydrogels exhibited salt-sensitivity and cation exchange properties.

CMC; hydrogels; swelling; N-vinyl pyrollidin; 2-Acrylamido-2-methyl propan Sulfonic acid

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