Synthesis of a Novel pH- and Salt-Responsive Super Absorbent Hydrogel based on Collagen-g-poly(AA-co-IA)

Mohammad Sadeghi¹* and Mojgan Yarahmadi²

¹Department of Chemistry, Science Faculty, Islamic Azad University, Arak Branch, Arak (Iran). ²Department of English, Humaniti Faculty, Islamic Azad University, Arak Branch, Arak (Iran).

ABSTRACT:

In this work, a novel family of pH-responsive polymeric hydrogel based on collagen was prepared. Acrylic monomers, acrylic acid (AA) and itaconic acid (IA) were simultaneously graft copolymerized onto collagen backbones by a free radical polymerization technique using ammonium persulfate (APS) as initiator and methylene bisacrylamide (MBA) as a crosslinker. A mechanism for the superabsorbent hydrogel formation was also suggested. Hydrogel formation was confirmed by FTIR spectroscopy. Results from scanning electron microscopy (SEM) observation also showed a porous structure with smooth surface morphology of the hydrogel. The swelling capacity of hydrogels was also measured in various salt solutions (LiCl, NaCl, KCl, CaCl2 and AlCl3). Due to high swelling ability in salt solutions, the hydrogel may be referred as “anti-salt superabsorbent” polymers.Furthermore, the water absorbency of hydrogels was measured in solutions with pH ranged 1 to 13. The collagenbased hydrogel exhibited a pH-responsiveness character so that a swelling-deswelling pulsatile behavior was recorded at pHs 2 and 8.

KEYWORDS:

Collagen; Hydrogel; pH- and salt-responsive; Vinylic monomers

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Copy the following to cite this article: Sadeghi M, Yarahmadi M. Synthesis of a Novel pH- and Salt-Responsive Super Absorbent Hydrogel based on Collagen-g-poly(AA-co-IA). Orient J Chem 2011;27(2).

Copy the following to cite this URL: Sadeghi M, Yarahmadi M. Synthesis of a Novel pH- and Salt-Responsive Super Absorbent Hydrogel based on Collagen-g-poly(AA-co-IA). Available from: http://www.orientjchem.org/?p=11694