Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 38, Issue 3, Pages 983-993Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2006.06.017
Keywords
chaotic mixing; carbon fiber; polymer-matrix composites (PMCs); electrical properties
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Electrically conductive composites of poly(methyl methacrylate) and carbon nanofibers (CNF) were prepared in a low-shear chaotic mixer. These materials showed a percolation threshold of approximately 2 wt.% CNF compared to 6 wt.% for materials prepared in an internal mixer under comparable conditions of mean shear rate. It was found in materials prepared by chaotic mixing that nanofibers were pulled out of the bundles and oriented along the flow directions to produce electrically conductive networks. Electrical conductivity showed great sensitivity to mixing time around percolation threshold and remained almost unchanged with prolonged chaotic mixing above the percolation threshold. Thermal, thermo-mechanical and mechanical properties of the composites were investigated. (c) 2006 Elsevier Ltd. All rights reserved.
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