Nanocomposites and nanomaterials

Relationship between IR absorption spectra and strength of polymer-CNT composite
Karachevtseva L.A.1, Kartel M.T.2, Lytvynenko O.O.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.

Carbon nanotubes are among the most anisotropic materials known and have extremely high values of Young's modulus. The possibilities to enhance the properties of nanostructured materials were investigated on “polymer-multiwall carbon nanotube” composites. Carbon high purity multiwall nanotubes (CNT) of 2 micron length and 20 nm diameter were obtained by catalytic pyrolysis of unsaturated hydrocarbons and cooled in vacuum. It was established that the effective way to enhance the strength properties of “polymer-multiwall carbon nanotube” composites is the composite crystallization and sp3 C-C tetrahedrons organization between nanotubes.
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. 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. The IR peak dependencies on the carbon nanotube content is described by a 1D Gaussian curve for the diffusion equation in the electric field. Thus, the way to improve the strength properties of “polymer-CNT” composites is composite 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.

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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.