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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
Metadata
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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
Journal
RSC ADVANCES
DOI
https://doi.org/10.1039/c4ra10478a
Collections
Graduate School of Natural and Applied Sciences, Article