Rheological Properties of the Polymeric Preparative Form of Chitosan Nanoascorbate from Bombyx mori

Chitosan nanoascorbate samples were synthesized by controlling the pH of the solution and the ratio of the initial components: ascorbic acid and chitosan derived from Bombyx mori. In this study, the rheological properties of polymeric preparative forms based on chitosan nanoascorbate and methylhydroxyethylcellulose systems at different concentrations were investigated. The chitosan nanoascorbate samples were obtained by regulating the ratio of Bombyx mori chitosan to ascorbic acid and adjusting the pH of the reaction medium during the synthesis process. In the initial 0.025 % chitosan nanoascorbate solution, the viscosity increased from 0.33 Pa·s to 4.14 Pa·s under shear, indicating possible hydrodynamic clustering and the formation of temporary aggregates between nanoparticles. In dilute systems containing 0.0125 % chitosan nanoascorbate and 0.1 % methylhydroxyethylcellulose, the viscosity increased from 3.1 Pa·s to 5.0 Pa·s, suggesting interactions between polymer chains and nanoparticles, although a fully developed spatial network was not formed. In the system with intermediate concentrations (0.025 % chitosan nanoascorbate : 0.2 % methylhydroxy­ethyl­cellulose), the viscosity varied from 6.2 Pa·s to 10.9 Pa·s and exhibited near-Newtonian flow behavior. In the system with the highest concentration (0.05 % chitosan nanoascorbate : 0.4 % methylhydroxyethylcellulose), the viscosity decreased from 45 Pa·s to 18 Pa·s, indicating pseudoplastic behavior and the partial disruption of the three-dimensional spatial network under shear. Frequency analysis and the Power-law model confirmed the viscosity and elastic properties of these two types of systems.

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