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Current issue   Ukr. J. Phys. 2016, Vol. 61, N 8, p.747-752
http://dx.doi.org/10.15407/ujpe61.08.0747    Paper

Lysenkov E.A.1, Klepko V.V.2

1 V.O. Sukhomlynskyi National University of Mykolayiv
(24, Nikols’ka Str., Mykolayiv 54030, Ukraine; e-mail: ealysenkov@ukr.net)
2 Institute of Macromolecular Chemistry, Nat. Acad. of Sci. of Ukraine
(148, Kharkivske Road, Kyiv 02160, Ukraine)

Pressure Effects on the Percolation Behavior of Systems Based on Polyethylene Oxide and Carbon Nanotubes

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: The percolation behavior of systems based on polyethylene oxide and carbon nanotubes (CNTs) and its dependence on the external pressure in the interval from 0.1 to 150 MPa have been studied,by using the method of impedance spectroscopy. As the external pressure grows, the percolation threshold is found to decrease from 0.3% to 0.14%, with the critical index of conductivity changing from 1.95 to 2.73. The change of critical indices testifies to a structural rearrangement of CNTs in the polymer matrix from their statistical distribution to compact aggregates. The experimental results are described well in the framework of the modified McLachlan model, which considers the dependence of the percolation threshold on the pressure.

Key words: polymer nanocomposites, carbon nanotubes, conductivity, percolation behavior,
external pressure.

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