Abstract
The specific electrical conductivity and dielectric constant of aqueous solutions of ionic aminopolysaccharide chitosan in L-aspartic acid were investigated. An increase of the mobility of charge carriers in these solutions was found in comparison with solutions of an individual acid. The evaluation of the kinetic stability revealed that the viscosity, electrical conductivity and dielectric constant of the chitosan – L-aspartic acid – water system decrease, while the pH value increases. It was shown that the time variation of physicochemical and electrochemical parameters is due to the effects of counterionic association with the transition of macromolecules to the ionomeric state and is accompanied by phase segregation of the polymer phase in the form of nano- and microparticles. The conducted studies carried out have shown the fundamental possibility of controlling the metastable state of this system in order to obtain nano- and microparticles.
Highlights
Chitosan (CTS), a product of partial or complete deacetylation of chitin, is an ionic copolymer of aminopolysaccharide
We have previously shown that the concentration dependence of the reduced specific viscosity of a freshly prepared aqueous solution of CTS aspartate is not linear, has a max or a plateau and a descending branch with a decrease in CTS [40]
A similar dependence is observed for aqueous solutions of individual aspartic acid (AspA)
Summary
Chitosan (CTS), a product of partial or complete deacetylation of chitin, is an ionic copolymer of aminopolysaccharide. The main contribution to the transfer of electricity in an aqueous acidic CTS solution is made by free counterions, as well as excess of hydronium ions [1,2,3]. In this case, the nature of the acid-solvent of CTS significantly affects the quantitative characteristics of electrical conductivity, which determines the conformation of macromolecules in solution and the phase state of the polymer system after removal of the liquid medium [1]. CTS films cast from aqueous solutions of carboxylic acids are characterized by a dense ordered structure
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