Steady and Dynamic Rheological Properties of Concentrated Chitosan Solutions at Different Concentrations and...

Area of Science:

• Materials Science
• Polymer Chemistry
• Rheology

Background:

• Chitosan's diverse applications necessitate comprehensive characterization.
• Chitosan's gel-forming ability significantly alters its rheological properties between solution and gel states.

Purpose of the Study:

• To investigate the rheological characteristics of chitosan solutions at various concentrations (1.25%, 2.5%, 4% w/v).
• To elucidate the influence of concentration on chitosan's solution and gel-based properties.

Main Methods:

• Steady and dynamic rheological measurements were employed.
• Mathematical models were utilized to analyze rheological data.
• Strain, angular frequency, and temperature sweep tests were performed.

Main Results:

• Chitosan concentration significantly impacts shear stress, viscosity, and dynamic rheological properties.
• Elastic behavior was observed at low concentrations/strains, transitioning to viscous behavior at higher concentrations/strains.
• Higher concentrations (4% w/v) demonstrated solid-like behavior, while lower concentrations showed viscous-like behavior. Temperature sweeps indicated a transition from viscous to elastic behavior with increasing temperature, and higher concentrations showed better structural recoverability.

Conclusions:

• Chitosan concentration is a critical factor governing its rheological profile.
• Understanding these rheological insights is vital for the design and development of chitosan-based products.
• The study provides a foundation for optimizing chitosan formulations for specific applications.