Post-extrusion heat-treatment as a facile method to enhance the mechanical properties of extruded xylan-based polymeric materials

Date

2014-01-01

Author

AKKUS, Merve
BAHÇEGÜL, Erinc
Özkan, Necati
Bakir, Ufuk

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Hemicelluloses are among the most abundant renewable polymers in nature, and their processing into biodegradable polymeric materials via extrusion was recently reported as a novel alternative technique for solvent casting. A simple heat-treatment step conducted after the extrusion of corn cob xylans was found to enhance the mechanical properties of strips by altering their moisture absorption behavior. Depending on the heat-treatment temperature, which varied between 60 degrees C and 150 degrees C, xylan- based strips with an ultimate tensile strength greater than 120 MPa, elongation at break of around 30% and elastic modulus of approximately 1.2 GPa were obtained. The equilibrium moisture content of the strips decreased with increasing heat-treatment temperature. Considering that water acts as a plasticizer for hemicellulose based materials, the changes in the mechanical properties were found to be associated with the changes in the equilibrium moisture contents of the strips.

Subject Keywords

Hemicellulose-based films, Chemical-composition, Wheat-straw, Aspen wood, Corn cobs, Pretreatment, Wettability, Temperature, Strength, Pulp

URI

https://hdl.handle.net/11511/31740

Collections

Graduate School of Natural and Applied Sciences, Article