期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 37, 期 3, 页码 134-142出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2005.09.009
关键词
chitosan gelation; apparent activation energy; small-amplitude oscillatory rheometry
Rheological proper-ties of concentrated chitosan aqueous solutions and gels in the presence of different organic and inorganic acids were investigated. Viscosities of the solutions increased with polymer concentration and degree of ionization. Strong gels were obtained at pH around 2 with oxalic, phosphoric and sulfuric acids. Gelation was favored by simple and short chain length acids and was governed by ionic interactions. The gels could be distinguished from solutions by the frequency independence of their dynamic moduli and their high apparent activation energy for flow. (c) 2005 Elsevier B.V. All rights reserved.
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