Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2020 Volume 18, Issue 2
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M. A. Alieksandrov, A. I. Misiura, T. M. Pinchuk-Rugal, Yu. E. Grabovskii, A. P. Onanko, O. P. Dmytrenko, M. P. Kulish, E. L. Pavlenko, T. O. Busko, ². P. Pundyk, A. M. Gaponov, À. ². Lesiuk
«Structural Features of Polymer Nanocomposite LDPE–MWCNT in the Percolation Transition Region of Electrical Conductivity»
299–310 (2020)

PACS numbers: 61.41.+e, 61.48.De, 62.23.Pq, 62.25.-g, 72.80.Tm, 73.61.Ph, 73.63.Fg

The behaviour of electrical conductivity, \(\sigma_{dc}\), in nanocomposites LDPE– MWCNT, depending on the nanotubes’ content, in the formation of the segregated filler morphology is considered. In this structure of nanocomposites, a low threshold value of percolation (\(\varphi_{c}\)=0.00099 vol. fract.) is obtained. As shown, only at low concentrations of nanotubes, there is a correlation in the changes of the crystallinity degree and the indicated physical–mechanical characteristics revealed by the methods of determining the crystallinity degree and the dynamic elastic modulus, shear modulus, and Poisson’s coefficients from the ultrasonic propagation velocities (~1 MHz). The orientational structure of the macromolecules adsorbed on the surface of the nanotubes appears at higher concentrations of MWCNT, when the crystallinity degree of the polymer matrix drops. The change in the polymer parameters that affects both the tunnelling of electrons in the region of interphase layers and, therefore, the change in electrical conductivity can be achieved by modifying the polymer matrix with \(\pi\)-conjugated materials, including dyes.

Keywords: low-density polyethylene (LDPE), multi-walled carbon nanotubes (MWCNT), electrical conductivity, degree of crystallinity, dynamic modules, dyes

https://doi.org/10.15407/nnn.18.02.299

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