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The kinetics of chitosan depolymerisation at different temperatures

Morris, Gordon, Castile, J., Smith, A., Adams, G. G. and Harding, Stephen E. (2009) The kinetics of chitosan depolymerisation at different temperatures. Polymer Degradation and Stability, 94 (9). pp. 1344-1348. ISSN 0141-3910

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    Abstract

    The stability (in terms of molar mass) of chitosan potentially plays an important role in its behaviour and functional properties in a wide range of applications and therefore any changes over time must be understood. The weight-average molar masses and intrinsic viscosities of chitosan solutions at different temperatures (4, 25 and 40 °C) have been investigated using size exclusion chromatography coupled to multi-angle laser light scattering (SEC-MALLS) and a "rolling ball" viscometer respectively. The weight-average molar mass (Mw) and the intrinsic viscosity ([η]) both decrease with increased storage time, although this phenomenon is more pronounced at elevated temperatures. Good correlation was found between the changes in molar mass and intrinsic viscosity with time and these parameters were used to determine the depolymerisation constant (k) and the activation energy (Ea). Knowledge of the effect of storage conditions (e.g. temperature) is important in the understanding the stability of chitosan solutions, but whether or not chitosan depolymerisation will be detrimental to its intended application will depend on the functional significance of the changes that occur. © 2009 Elsevier Ltd. All rights reserved.

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    Item Type: Article
    Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Polymer Degradation and Stability Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Polymer Degradation and Stability Volume 94, Issue 9, September 2009, Pages 1344–1348
    Uncontrolled Keywords: Activation energies Chitosan Intrinsic viscosity Kinetics Molar mass Stability Average molar mass Chitosan solution Elevated temperature Functional properties Good correlations Multiangle laser light scattering Rolling balls SEC-MALLS Storage condition Storage time Chitin Chromatographic analysis Light scattering Polyethylene terephthalates Size exclusion chromatography Viscometers Viscosity Activation energy
    Subjects: Q Science > QD Chemistry
    Schools: School of Applied Sciences
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    Language of Original Document: English
    Correspondence Address: Morris, G.A.; National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington, LE12 5RD, United Kingdom; email: gordon.morris@nottingham.ac.uk
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    Depositing User: Gordon Morris
    Date Deposited: 13 Sep 2012 16:31
    Last Modified: 13 Sep 2012 16:31
    URI: http://eprints.hud.ac.uk/id/eprint/14605

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