Fairclough, J.P.A. orcid.org/0000-0002-1675-5219, Yu, H.A.O., Kelly, O. et al. (3 more authors) (2012) The interplay between gelation and phase separation in aqueous solutions of methylcellulose and hydroxypropyl methylcellulose. Langmuir, 28 (28). pp. 10551-10557. ISSN 0743-7463
Abstract
Thermally-induced gelation in aqueous solutions of methylcellulose (MC) and hydroxypropyl methylcellulose (HPMC) has been studied by rheological, optical microscopy and turbidimetry measurements. The structural and mechanical properties of these hydrogels are dominated by the interplay between phase separation and gelation. In MC solutions, phase separation takes place almost simultaneously with gelation. An increase in the storage modulus is coupled to the appearance of a bicontinuous structure upon heating. However, a thermal gap exists between phase separation and gelation in the case of HPMC solutions. The storage modulus shows a dramatic decrease during phase separation, and then rises in the subsequent gelation. A macroporous structure forms in the gels via “viscoelastic phase separation” linked to “double phase separation”.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Reproduced in accordance with the publisher's self-archiving policy. Copyright 2012 American Chemical Society. |
Keywords: | methylcellulose, gelation |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Funding Information: | Funder Grant number The Dow Chemical Company UNSPECIFIED |
Depositing User: | Dr Patrick Fairclough |
Date Deposited: | 26 Mar 2013 14:28 |
Last Modified: | 20 Jan 2014 13:38 |
Published Version: | http://dx.doi.org/10.1021/la300971r |
Status: | Published |
Publisher: | American Chemical Society |
Refereed: | Yes |
Identification Number: | DOI: 10.1021/la300971r |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:74957 |