Effect of extrusion screw speed on biocomposite thermo-mechanical properties

Chevali, Venkata S. and Ulven, Chad A. (2012) Effect of extrusion screw speed on biocomposite thermo-mechanical properties. International Journal of Sustainable Engineering, 5 (1). pp. 38-46. ISSN 1939-7038


Thermo-mechanical, optical and physical properties of polypropylene (PP)/lignocellulosic fibre-filled/maleated PP composites were studied as a function of extrusion screw speeds. All materials were extruded at four screw speeds and injection moulded as dogbone specimens. The density, yellowness index (YI) and Fourier-transform infrared spectra were determined for the processed specimens. Tensile properties and coefficient of linear thermal expansion (CLTE) were also determined. The densities of the composites remained constant within the same composition. YI and absorbances of carbonyl, vinylidene and hydroxyl groups, which are indicators of thermo-oxidation, decreased with a shorter extruder residence time. The CLTE and tensile properties showed peak properties at intermediate screw speeds. The analysis suggested optimising the residence time assisting in achieving a balance of properties.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Historic - Institute for Agriculture and the Environment
Date Deposited: 04 Aug 2016 01:57
Last Modified: 06 Mar 2018 06:09
Uncontrolled Keywords: biocomposites; extrusion; thermal degradation; infrared spectroscopy; tensile properties; yellowness index
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030399 Macromolecular and Materials Chemistry not elsewhere classified
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
Socio-Economic Objective: B Economic Development > 86 Manufacturing > 8604 Leather Products, Fibre Processing and Textiles > 860403 Natural Fibres, Yarns and Fabrics
Identification Number or DOI: 10.1080/19397038.2010.547625
URI: http://eprints.usq.edu.au/id/eprint/28685

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