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Mechanical reinforcement of continuous flow spun polyelectrolyte complex fibers
Alberto J Granero1, Joselito M Razal, Gordon G Wallace
1ARC Center of Excellence for Electromaterials Science, Intelligent Polymer Research Institute, School of Chemistry, University of Wollongong, Northfields Avenue, Wollongong, NSW, Australia.
Researchers developed a continuous flow wet-spinning method to create stronger chitosan and gellan gum fibers. Spinning gellan gum into chitosan yielded the strongest biopolymer fibers, offering a cross-linking-free alternative for bio-fiber applications.
Area of Science:
- Materials Science
- Biopolymer Engineering
- Textile Science
Background:
- Chitosan and gellan gum are oppositely charged biopolymers with potential for fiber applications.
- Mechanical reinforcement of biopolymer fibers is crucial for expanding their use.
- Existing methods often require cross-linking, which can complicate processing and affect material properties.
Purpose of the Study:
- To develop a simple, continuous flow wet-spinning method for mechanically reinforcing chitosan and gellan gum fibers.
- To investigate the effect of biopolymer addition order on fiber mechanical properties.
- To explore the potential of these fibers as a cross-linking-free alternative to traditional bio-fibers.
Main Methods:
- Utilized a continuous flow wet-spinning technique to combine chitosan and gellan gum solutions.
- Systematically varied the order of biopolymer addition during the spinning process.
- Characterized the mechanical properties (Young's modulus, tensile strength, toughness) of the resulting fibers.
- Assessed the ionic conductivity of the fibers in the presence of water vapor.
Main Results:
- The order of biopolymer addition significantly influenced the mechanical properties of the fibers.
- Spinning gellan gum into chitosan resulted in fibers with significantly enhanced Young's modulus, tensile strength, and toughness.
- The developed method achieved mechanical reinforcement without the need for chemical cross-linking.
- The fibers exhibited ionic conductivity when exposed to water vapor.
Conclusions:
- A facile continuous flow wet-spinning method effectively enhances the mechanical properties of chitosan/gellan gum fibers.
- The gellan gum into chitosan spinning order produces the strongest biopolymer fibers.
- These reinforced fibers represent a promising, cross-linking-free alternative for various bio-fiber applications.
- The ionically conducting nature of the fibers in humid conditions opens possibilities for sensor applications.
