ADSORPTION AND DILATIONAL RHEOLOGICAL PROPERTIES OF CHITOSAN LACTATE AT THE LIQUID-GAS INTERFACE

Abstract

The adsorption and dilatational rheological characteristics (the elasticity and viscosity modulus) of chitosan lactate at the liquid-gas interface are investigated by the oscillating drop shape method. The dependences of the dynamic and equilibrium surface tension on the concentration of chitosan lactate in solution have been determined. It was found that the dependences obtained are similar to those for surface-active high-molecular weight compounds. The dependences of the surface elasticity and viscosity of chitosan lactate on the oscillation frequency and concentration have been studied. It has been shown that chitosan lactate is capable of forming elastic adsorption layers with the values of the viscoelastic modulus comparable to that of protein biopolymers.

Keywords

• chitosan
• surface tension
• viscoelastic modulus
• elasticity modulus
• viscosity modulus
• liquid-gas interface