Effect of solvent state and isothermal conditions on gelation of methylcellulose hydrogels
Joshi, Sunil Chandrakant
Liang, C. M.
Lam, Yee Cheong
Date of Issue2012-04-02
School of Mechanical and Aerospace Engineering
In this study, thermal behavior of aqueous solutions of methyl cellulose (MC) at a constant temperature of 50°C was analyzed. Various samples were studied for two consecutive heating–cooling cycles. The experiments with the solutions prepared using cold de-ionized (DI) water showed that the rate of gelation was higher for higher MC concentrations. However, the rate was slower during the first heating–cooling cycle than during the second cycle. The possible reasons behind such observations are discussed. Various MC solutions prepared using hot DI water were studied for understanding the role of the solvent state in the isothermal gelation process. The gelation of these MC solutions started at a lower MC concentration and resulted in a higher gelation rate. The gelation mechanism responsible for such effects is explored and presented. Finally, a gel-indexing method is proposed to provide a quantitative measure of the gelation state of all the MC gels.
Journal of Biomaterials Science, Polymer Edition
© 2008 Koninklijke Brill NV, Leiden. This is the author created version of a work that has been peer reviewed and accepted for publication in Journal of Biomaterials Science, Polymer Edition, published by Taylor & Francis on behalf of Koninklijke Brill NV, Leiden. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1163/156856208786440460].