Abstract
The chitosan (CS) dissolved in an acid solution displays a polyelectrolyte behavior. It was found that the viscosity behavior of CS solutions could be described by the theoretical viscosity expression, proposed by Hess and Klein. Phenomenologically, on the basis of this viscosity theory and Huggins viscosity equation for non-ionic polymer solutions, a new viscosity theoretical expression was developed to describe the viscosity behavior of binary system CS–poly(ethylene glycol) (PEG) in the presence of added salt. It was found that the observed viscosity data were in good agreement with the new viscosity expression. Meanwhile the parameter λ of the new equation was proposed to characterize the interactions between CS and PEG chains in CS–PEG aqueous solutions. From the change of the calculated values of λ with the added salt and PEG concentration, the interaction between CS and PEG and the structure of the formed CS–PEG complex were discussed.
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