Abstract
Light scattering and rheological properties of chitosan solutions in 2% acetic acid aqueous solution were measured by means of a low angle laser light scattering photometer (Chromatix, KMX6) and a cone-plate Weissenberg Rheogoniometer (Sangamo Controls, R18). Chitosan samples of CS62 and CS79, which have degrees of deacetylation of 0.62 and 0.79, respectively, associate even in very low concentrations such as 10-5g/ml and a degree of association is 2-3. On the other hand, the molecular association does not occur in a chitosan CS96, which has a relatively high degree of deacetylation of 0.96.Rheological properties show that the solutions of CS62 and CS96 are homogeneous and the solutions of CS79 are heterogeneous, with a certain relaxation mechanism having relatively long relaxation times. The effect of the molecular association and the heterogeneous structure on stress overshoot is also discussed.
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