THz Spectroscopy as a Versatile Tool for Filler Distribution Diagnostics in Polymer Nanocomposites

Polymer composites containing nanocarbon fillers are under intensive investigation worldwide due to their remarkable electromagnetic properties distinguished not only by components as such, but the distribution and interaction of the fillers inside the polymer matrix. The theory herein reveals that...

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Bibliographic Details
Published in:Polymers 2020-12, Vol.12 (12), p.3037
Main Authors: Gorokhov, Gleb, Bychanok, Dzmitry, Gayduchenko, Igor, Rogov, Yuriy, Zhukova, Elena, Zhukov, Sergei, Kadyrov, Lenar, Fedorov, Georgy, Ivanov, Evgeni, Kotsilkova, Rumiana, Macutkevic, Jan, Kuzhir, Polina
Format: Article
Language:English
Subjects:
Addition polymerization
Carbon
Coextrusion
Composite materials
Dielectric properties
Electric properties
Electromagnetic properties
Extrusion
Fillers
Graphene
Homogeneity
Hot pressing
Humidity
Investigations
Multi wall carbon nanotubes
Nanocomposites
Nanoparticles
Percolation
Polymer matrix composites
Polymers
Spectroscopy
Spectrum analysis
Thin films
Transmission electron microscopy
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Summary:Polymer composites containing nanocarbon fillers are under intensive investigation worldwide due to their remarkable electromagnetic properties distinguished not only by components as such, but the distribution and interaction of the fillers inside the polymer matrix. The theory herein reveals that a particular effect connected with the homogeneity of a composite manifests itself in the terahertz range. Transmission time-domain terahertz spectroscopy was applied to the investigation of nanocomposites obtained by co-extrusion of PLA polymer with additions of graphene nanoplatelets and multi-walled carbon nanotubes. The THz peak of permittivity's imaginary part predicted by the applied model was experimentally shown for GNP-containing composites both below and above the percolation threshold. The physical nature of the peak was explained by the impact on filler particles excluded from the percolation network due to the peculiarities of filler distribution. Terahertz spectroscopy as a versatile instrument of filler distribution diagnostics is discussed.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym12123037