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

Mikhail V. Shuba; Alesia Paddubskaya; Polina P. Kuzhir; Gregory Y. Slepyan; Dalius Seliuta; Irmantas Kašalynas; Gintaras Valušis; Akhlesh Lakhtakia

doi:10.1117/1.JNP.6.061708

12 October 2012 Effect of annealing and biaxial deformation on the dielectric properties of composites of multiwall carbon nanotubes and poly(ethylene terephthalate)

Mikhail V. Shuba, Alesia Paddubskaya, Polina P. Kuzhir, Gregory Y. Slepyan, Dalius Seliuta, Irmantas Kašalynas, Gintaras Valušis, Akhlesh Lakhtakia

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Journal of Nanophotonics, Vol. 6, Issue 1, 061708 (October 2012). https://doi.org/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.

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Mikhail V. Shuba, Alesia Paddubskaya, Polina P. Kuzhir, Gregory Y. Slepyan, Dalius Seliuta, Irmantas Kašalynas, Gintaras Valušis, and Akhlesh Lakhtakia "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 (12 October 2012). https://doi.org/10.1117/1.JNP.6.061708

Published: 12 October 2012

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