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Comparative analysis of electric, magnetic, and mechanical properties of epoxy matrix composites with different contents of multiple walled carbon nanotubes
Author(s) -
Zilli D.,
Goyanes S.,
Escobar M. M.,
Chiliotte C.,
Bekeris V.,
Cukierman A. L.,
Rubiolo G. H.
Publication year - 2007
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20288
Subject(s) - materials science , percolation threshold , composite material , carbon nanotube , epoxy , porosity , chemical vapor deposition , mass fraction , volume fraction , sonication , fabrication , dispersion (optics) , percolation (cognitive psychology) , nanocomposite , electrical resistivity and conductivity , nanotechnology , chemical engineering , alternative medicine , physics , medicine , optics , pathology , electrical engineering , engineering , neuroscience , biology
Epoxy composites based on aligned chemical vapor deposition–grown multiwall carbon nanotubes (MWCNTs), containing trapped iron nanoparticles, with weight fractions ranging from 0.03 to 1 wt%, were produced following a well‐known processing way. Electrical and mechanical properties as well as their densities were measured. The results are compared with previous studies investigating the magnetic percolation behavior in the same samples of composites. A percolation threshold at 0.4 wt% of MWCNTs was determined by the electrical property and it agrees with the threshold observed in the magnetic properties. A hop in the porosity and a depression of the bulk mechanical properties were also found at the threshold value. These results point out that there is an efficiency threshold related to the sonication stage of the fabrication process and the weight fraction of MWCNTs, and after this threshold, the initial nanotubes pans were not separated into individual MWCNTs or into small ropes. An optimized sonication stage is proposed and the improvement in the dispersion of the filler is shown. POLYM. COMPOS., 28:612–617, 2007. © 2007 Society of Plastics Engineers