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Effect of filler orientation on the electrical conductivity of carbon Fiber/PMMA composites
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
2018 (English)In: Fibers, ISSN 2079-6439, Vol. 6, no 1, article id 3Article in journal (Refereed) Published
Abstract [en]

The electrical conductivity of extruded carbon fiber (CF)/Polymethylmethacrylate (PMMA) composites with controlled CF aspect ratio and filler fractions ranging from 0 to 50 vol. % has been investigated and analyzed. The composites were extruded through a capillary rheometer, utilizing either 1-mm or 3-mm diameter extrusion dies, resulting in cylindrical composite filaments of two different diameters. Since the average CF orientation becomes more aligned with the extrusion flow when the diameter of the extrusion dies decreases, the relationship between conductivity and average fiber orientation could therefore be examined. The room temperature conductivities of the extruded filaments as a function of CF fractions were fitted to theMcLachlan general effective medium (GEM) equation and the percolation thresholds were determined to 20.0 ± 2.5 vol. % and 32.0 ± 5.9 vol. % for the 3-mm (with CFs oriented less) and 1-mm(with CFs orientedmore) filaments, respectively. It turned out that the oriented CFs in the composite shift the percolation threshold to a higher value, however, the conductivity above the percolation threshold is higher for composites with oriented CFs. A novel approach based on the Balberg excluded volume theory was proposed to explain this counterintuitive phenomenon. 

Place, publisher, year, edition, pages
MDPI Multidisciplinary Digital Publishing Institute , 2018. Vol. 6, no 1, article id 3
Keywords [en]
Carbon fibers, Conductivity, Extrusion, Orientation
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-227414DOI: 10.3390/fib6010003ISI: 000428507900003Scopus ID: 2-s2.0-85042261367OAI: oai:DiVA.org:kth-227414DiVA, id: diva2:1210686
Note

Export Date: 9 May 2018; Article; Correspondence Address: Qu, M.; Institute of Polymer Materials, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstr. 7, Germany; email: muchao.qu@fau.de. QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-06-19Bibliographically approved

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Nilsson, Fritjof

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