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Materials 2011, 4(3), 543-552; doi:10.3390/ma4030543
Article

Crosslinked Graft Copolymer of Methacrylic Acid and Gelatin as a Novel Hydrogel with pH-Responsiveness Properties

1,*  and 2
1 Department of Chemistry, Science Faculty, Islamic Azad University, Arak Branch, 38156 Arak, Iran 2 Department of Chemical Engineering, Engineer Faculty, Islamic Azad University, Arak Branch, 38156 Arak, Iran
* Author to whom correspondence should be addressed.
Received: 15 January 2011 / Revised: 20 February 2011 / Accepted: 24 February 2011 / Published: 2 March 2011
(This article belongs to the Special Issue Recent Advances in Stimuli-Responsive Materials)
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Abstract

In this paper, a novel gelatin-based hydrogel was synthesized through crosslinking graft copolymerization of methacrylic acid (MAA) onto gelatin, using ammonium persulfate (APS) as a free radical initiator in the presence of methylenebisacrylamide (MBA) as a crosslinker. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR spectroscopy and gravimetric analysis of the products. Moreover, morphology of the samples was examined by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA/DTG). The effect of reaction variables such as concentration of APS and MBA were systematically optimized to achieve a hydrogel with swelling capacity as high as possible. The gelatin-g-PMAA hydrogel exhibited a pH-responsiveness character so that a swelling-deswelling pulsatile behavior was recorded at pHs 2 and 8. This on-off switching behavior makes the hydrogel as a good candidate for controlled delivery of bioactive agents.
Keywords: gelatin; methacrylic acid; graft copolymers gelatin; methacrylic acid; graft copolymers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sadeghi, M.; Heidari, B. Crosslinked Graft Copolymer of Methacrylic Acid and Gelatin as a Novel Hydrogel with pH-Responsiveness Properties. Materials 2011, 4, 543-552.

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