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AC Conductivity of Carbon Fiber - Polymer Matrix

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dc.title AC Conductivity of Carbon Fiber - Polymer Matrix en
dc.contributor.author Římská, Zdeňka
dc.contributor.author Křesálek, Vojtěch
dc.contributor.author Špaček, Josef
dc.relation.ispartof Polymer Composites
dc.identifier.issn 0272-8397 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2002
utb.relation.volume 23
utb.relation.issue 1
dc.citation.spage 95
dc.citation.epage 103
dc.type article
dc.language.iso en
dc.publisher Society of Plastics Engineers, Inc., Brookfield Center en
dc.identifier.doi 10.1002/pc.10415
dc.relation.uri http://onlinelibrary.wiley.com/doi/10.1002/pc.10415/abstract
dc.subject uhlíková vlákna cs
dc.subject elektromagentická kompatibilita cs
dc.subject carbon fibers en
dc.subject electromagnetic compatibility en
dc.description.abstract This paper reports results on experimental investigation of the conductivity behavior of carbon fiber filled polymer composites at the percolation threshold. Two types of carbon fiber - epoxy matrix composites have been studied and comparison of the measured data has been made. These two types of composites differ in the surface modification of carbon fibers (in one case the surface of carbon fibers is covered with polymer beads using the microencapsulation technology, in the other their surface stayed unmodified). Experimental data reveal that surface modification of carbon fibers influences greatly the DC conductivity (percolation threshold moves to higher concentrations) but does not influence the AC electrical properties. From the frequency dependence of conductivity on fiber concentration it becomes clear that it is not possible to predict the high frequency conductivity (electromagnetic interference shielding properties) based on the DC conductivity. Percolation behavior of conductivity as a function of conductive filler concentration is typical only for DC or low frequency AC conductivity. The percolation threshold gradually vanishes for high frequencies of electromagnetic field. The temperature dependence of electrical properties has also been studied. Composites with concentration near the percolation threshold show the switch-off effect (at the specific temperature the DC conductivity drops by several orders of magnitude). This switch-off effect does not occur for high frequency AC conductivity. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1000147
utb.identifier.rivid RIV/70883521:28110/02:63500730
utb.identifier.obdid 11052609
utb.identifier.scopus 2-s2.0-0036465909
utb.identifier.wok 000174111400010
utb.source j-riv
utb.contributor.internalauthor Římská, Zdeňka
utb.contributor.internalauthor Křesálek, Vojtěch
utb.contributor.internalauthor Špaček, Josef
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