Elaboration, synthesis and characterization by the viscosimetric study of chitosan materials in dimethyl sulfoxide hydrochloric acid

ABSTRACT

The present work is concerned with experimental results of viscosimetric properties of materials biopolymer of chitosan solutions in HCl acid and dimethyl sulphoxide DMSO. The dynamic viscosity of solutions of Chitosan CH + DMSO/HCl over a wide range of concentrations (1 to 10) g/l and at different temperatures (293.15 to 318.15) K was measured. The reduced dynamic viscosity and the activation energy of reduced dynamic viscosity E_η are calculated. Biopolymer solutions exhibit a critical concentration c*, separating the dilute solutions and semi-dilute solutions. The most important results refer to the activation energy of reduced dynamic viscosity found from Arrhenius plots. The dependence of the activation energy on solution concentration and temperature is discussed. The biopolymer CH behaviour can be extrapolated from the Flory-Huggins theory by decomposing such as E_η = (E_η)^di + (E_η)^sdi + (E_η)^cri. The dilute solution behaviour of Arrhenius is described by the CH-DMSO/HCL interaction and represented by the function (E_η)^di. For the semi-dilute solution behaviour of non-Arrhenius which is described by the interaction between the CH–CH and represented by the function (E_η)^sdi. The critical solution behaviour is described by the interaction between the CH-CH-DMSO/HCl and represented by the function (E_η)^cri.

KEYWORDS:

• Reduced viscosity
• activation energy
• temperature
• polymer
• chitosan
• DMSO

Disclosure statement

No potential conflict of interest was reported by the authors.