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Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate)
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Urvakis, Marius, Kuprevičiūtė, Austė, Banys, Jūras, Macutkevic, Juras, Mayoral, Beatriz and McNally, Tony (2012) Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate). Journal of Nanophotonics, 6 (1). 061708 . doi:10.1117/1.JNP.6.061708 ISSN 1388-0764.
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Official URL: http://dx.doi.org/doi:10.1117/1.JNP.6.061708
Abstract
The dielectric properties of composites of poly(ethylene terephthalate) (PET) with MWCNTs were investigated over a wide frequency and temperature range below and close to the electrical percolation threshold. In composites with 1 wt.% multiwall carbon nanotubes (MWCNT) inclusions, the dielectric properties below room temperature are mostly determined by β relaxation, as a consequence of the rotation of PET molecules. In stretched samples, the CNTs are oriented at about 45 deg to the stretch direction. Such deformation increased the potential for molecular rotation. However, annealing after stretching increased homogeneity of the composite and decreased the potential barrier for polymer chain rotation. Electrical conductivity effects and Maxwell-Wagner polarization mostly cause the dielectric properties of the samples with 2% MWCNT inclusions. The potential barrier for carrier tunneling is lowest in the annealed sample.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
Library of Congress Subject Headings (LCSH): | Carbon nanotubes, Polyethylene terephthalate | |||||||||
Journal or Publication Title: | Journal of Nanophotonics | |||||||||
Publisher: | Springer Netherlands | |||||||||
ISSN: | 1388-0764 | |||||||||
Official Date: | 12 October 2012 | |||||||||
Dates: |
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Volume: | 6 | |||||||||
Number: | 1 | |||||||||
Article Number: | 061708 | |||||||||
DOI: | 10.1117/1.JNP.6.061708 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
RIOXX Funder/Project Grant: |
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