Journal
COMPOSITES PART B-ENGINEERING
Volume 58, Issue -, Pages 259-266Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2013.10.068
Keywords
Rheological properties; Mechanical testing; Extrusion; Kenaf fiber composites
Funding
- University of Malaya [IPPP, PS347-2010A, PV003-2011B, RG150-11AFR]
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The effects of extrusion processing temperature on the rheological, dynamic mechanical analysis and tensile properties of kenaf fiber/high-density polyethylene (HDPE) composites were investigated for low and high processing temperatures. The rheological data showed that the complex viscosity, storage and loss modulus were higher with high processing temperature. Complex viscosities of pure HDPE and 3.4 wt% composite with zero shear viscosity of <= 2340 Pa s were shown to exhibit Newtonian behavior while composites of 8.5 and 17.5 wt% with zero shear viscosity >= 30,970 Pa s displayed non-Newtonian behavior. The Han plots revealed the sensitivity of rheological properties with changes in processing temperature. An increase in storage and loss modulus and a decrease in mechanical loss factor were observed for 17.5 wt% composites at high processing temperature and not observed at low processing temperature. Processing at high temperature was found to improve the tensile modulus of composites but displayed diminished properties when processed at low processing temperature especially at high fiber content. At both low and high processing temperatures, the tensile strength and strain of the composite decreased with increased content of the fiber. (C) 2013 Elsevier Ltd. All rights reserved.
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