Nanocomposites and nanomaterials

“Semiconductor” model of the “polymer-CNTs” composite strengthening
Karachevtseva L.A.1, Kartel M.T.2, Lytvynenko O.O.1, Onyshchenko V.F.1
1 Laboratory of Photonic Semiconductor Structures, V. Lashkaryov Institute of Semiconductor Physics, NASU, Prsp. Nauki, 41, Kiev-03028, Ukraine.
E-mail: lytvole@gmail.com
2 Department of Nanoporous and Nanosized Carbon Materials, O. Chuiko Institute of Surface Chemistry, NASU, 17 General Naymov Street, Kyiv 03164 Ukraine.

We investigated possibilities to enhance the properties of nanostructured surfaces on “polymer-multiwall carbon nanotube” composites at 300 K. Carbon nanotubes (CNT) are among the most anisotropic materials known and have extremely high values of Young's modulus. Influence of vibrational bonds on polymer crystallization and strengthening in composite films of polyethylenimine, polyamide, polypropylene and rubber with multiwall carbon nanotubes was analysed. IR absorption maxima is measured after formation of composite “polyethylenimine–carbon nanotube” in the area of the sp3 hybridization bonds at the frequency of primary amino groups of polyethylenimine [1]. High IR absorption at frequencies of sp3 hybridization bonds of polypropylene, polyamide-6 with carbon nanotubes is determined by γω(CН) and γω(CH2) vibrations [2]. IR reflectance maxima of composite “rubber–carbon nanotube” are in the area of CH valence and deformation vibrations. The IR peak dependence on the carbon nanotube content corresponds to 1D Gaussian curve for the diffusion equation in the electric field. Thus, the way to improve the strength properties of “polymer–CNT” composites is polymer structuring supported by vibrations in the intrinsic electric field between nanotube and polymer matrix. Tensile strength for polyamide-6 composites at 0.25% CNT increases 1.7 times and tensile deformation – 2.3 times.

1.	Karachevtseva L.A., Kartel M.T., Lytvynenko O.O., Onyshchenko V.F., et.al. Polymer-nanoparticle coatings on macroporous silicon matrix // Advanced Materials Letters.-2017.-8, N 4.-P. 336-341.
2.	Karachevtseva L., Kartel M., Wang Bo, Lytvynenko O., et.al. Formation of carbon sp3 hybridization bonds in local electric fields of composites “polymer-CNT” // Advanced Materials Letters.-2018.-9, N 4.-P. 296-300.