Special Section on Fundamental and Applied Nanoelectromagnetics

Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate)

[+] Author Affiliations
Marius Urvakis

Vilnius University, Faculty of Physics, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

Auste Kupreviciute

Vilnius University, Faculty of Physics, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

Juras Banys

Vilnius University, Faculty of Physics, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

Jan Macutkevic

Vilnius University, Faculty of Physics, Sauletekio Avenue 9, LT-10222 Vilnius, Lithuania

Beatriz Mayoral

Queen’s University, Belfast, School of Mechanical & Aeropsace Engineering, Belfast, BT9 5AH, United Kingdom

Tony McNally

Queen’s University, Belfast, School of Mechanical & Aeropsace Engineering, Belfast, BT9 5AH, United Kingdom

J. Nanophoton. 6(1), 061708 (Oct 12, 2012). doi:10.1117/1.JNP.6.061708
History: Received June 11, 2012; Revised September 17, 2012; Accepted September 21, 2012
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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.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Marius Urvakis ; Auste Kupreviciute ; Juras Banys ; Jan Macutkevic ; Beatriz Mayoral, et al.
"Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate)", J. Nanophoton. 6(1), 061708 (Oct 12, 2012). ; http://dx.doi.org/10.1117/1.JNP.6.061708


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