Gelation behavior of polysaccharide-based interpenetrating polymer network (IPN) hydrogels

Choudhary, S. and White, J. C. and Stoppel, W. L. and Roberts, S. C. and Bhatia, S. R.. (2011) Gelation behavior of polysaccharide-based interpenetrating polymer network (IPN) hydrogels. Rheologica Acta, 50 (1). pp. 39-52.

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We report the preparation and rheological characterization of interpenetrating polymer network (IPN) hydrogels made from alginate and hydrophobically modified ethyl hydroxyl ethyl cellulose (HMEHEC). To our knowledge, there have been no studies of the gelation behavior of IPNs. We found that the rheology of these systems can be easily tuned, with the elastic modulus of the IPN strongly dependent on the relative ratio of HMEHEC to alginate. The sol-gel transition of these systems was found to satisfy the Winter-Chambon criterion for gelation at various crosslinker densities. From the power law relationship of the dynamic moduli (G (') similar to G (aEuro3) similar to omega (n)), the exponent n appears to be dependent on both the crosslinker density and relative amount of two polymers. The value of n was found to be similar to 0.5 for all samples for stoichiometric amounts of crosslinker. The effect of molecular weight of HMEHEC on the gel point and viscoelastic exponent has also been reported. Alginate seems to dominate the kinetics of the process but the effect of high molecular weight HMEHEC on the gel point, especially at lower proportion was also evident.

Item Type: Article
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials
Collections: Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing
Depositing User: Robert Stevens
Date Deposited: 19 Apr 2012 20:39
Last Modified: 02 May 2012 18:06

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