Published in 2021

Epoxy Molecular Structure Alteration in Graphene-Epoxy Nanocomposites: Loading Effects

Authors: Gorelov B.M., Gorb A.M., Czapla Z., Wacke S., Nadtochiy A.B., Kuryliuk V.V., Kostrzewa M., Ingram A., Polovina O.I., Sigareva N.V.

Journal: Springer Proceedings in Physics

Description:

Molecular structure alteration in a polyethylene-polyamine-cured DGEBA-epoxy resin induced by multi-layered graphene nanoplatelets (MLGNPs) have been experimentally studied by broadband dielectric spectroscopy (BDS), thermal-desorption mass-spectroscopy (TDMS), phase-frequency continuous-wave ultrasound probing (USP), compression-mode static mechanical loading (SML), and positron-annihilation lifetime spectroscopy (PALS). The MLGNPs were about 5 × 5 μm in lateral size, about 50 nm in thickness, and of the specific surface area ~790 m2/g. The filler’s loading in the GNP-epoxy nanocomposites varied as 0.5, 1.0, 2.0, and 5.0% by mass. Loading effects in a number of physical parameters sensitive to molecular structure of the nanocomposites have been detected. The physical reasons underlying the effects have been discussed.

Published in 2021

Structural and Dipole-Relaxation Processes in Epoxy–Multilayer Graphene Composites with Low Filler Content

Authors: Gorelov, B.M.; Mischanchuk, O.V.; Sigareva, N.V.; Shulga, S.V.; Gorb, A.M.; Polovina, O.I.; Yukhymchuk, V.O.

Journal: Polymers

Description:

Multilayered graphene nanoplatelets (MLGs) were prepared from thermally expanded graphite flakes using an electrochemical technique. Morphological characterization of MLGs was performed using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Raman spectroscopy (RS), and the Brunauer–Emmett–Teller (BET) method. DGEBA-epoxy-based nanocomposites filled with synthesized MLGs were studied using Static Mechanical Loading (SML), Thermal Desorption Mass Spectroscopy (TDMS), Broad-Band Dielectric Spectroscopy (BDS), and Positron Annihilation Lifetime Spectroscopy (PALS). The mass loading of the MLGs in the nanocomposites was varied between 0.0, 0.1, 0.2, 0.5, and 1% in the case of the SML study and 0.0, 1.0, 2, and 5% for the other measurements. Enhancements in the compression strength and the Young’s modulus were obtained at extremely low loadings (C≤ 0.01%). An essential increase in thermal stability and a decrease in destruction activation energy were observed at C≤ 5%. Both the dielectric permittivity (ε1) and the dielectric loss factor (ε2) increased with increasing C over the entire frequency region tested (4 Hz–8 MHz). Increased ε2 is correlated with decreased free volume when increasing C. Physical mechanisms of MLG–epoxy interactions underlying the effects observed are discussed.

Published in 2020

Influence of γ-irradiation and ultrasound treatment on current mechanism in Au-SiO2-Si structure

Authors: A.M. Gorb, O.A. Korotchenkov, O.Ya. Olikh, A.O. Podolian, R.G. Chupryna

Journal: Solid-State Electronics

Published in 2019

Impact of Multilayered Graphene Nanoplatelets on 3D-molecular Network of an Epoxy Resin

Authors: -

Journal: 2019 IEEE 9th International Conference Nanomaterials: Applications & Properties (NAP)

Published in 2019

Epoxy filled with bare and oxidized multi-layered graphene nanoplatelets: a comparative study of filler loading impact on thermal properties

Authors: Borys Gorelov, Alla Gorb, Andriy Nadtochiy, Dmitro Starokadomsky, Vasyl Kuryliuk, Nadia Sigareva, Sergey Shulga, Volodymyr Ogenko, Oleg Korotchenkov, Oleksiy Polovina

Journal: Journal of Materials Science

Published in 2018

Acousto-defect interaction in irradiated and non-irradiated silicon n ⁺- p structures

Authors: O. Ya. Olikh, A. M. Gorb, R. G. Chupryna, O. V. Pristay-Fenenkov

Journal: Journal of Applied Physics

Published in 2018

Filler's impact on structure and physical properties in polyester resin–oxide nanocomposites

Authors: -

Journal: Adsorption Science and Technology

Published in 2015

Electron and hole separation in Ge nanocones formed on Si <inf>1-x</inf> Ge <inf>x</inf> solid solution by Nd:YAG laser radiation

Authors: A. Gorb, O. Korotchenkov, V. Kuryliuk, A. Medvid, G. Mozolevskis, A. Nadtochiy, A. Podolian

Journal: Applied Surface Science

Published in 2015

Impact of titanium and silica/titanium fumed oxide nanofillers on the elastic properties and thermal decomposition of a polyester resin

Authors: Borys Gorelov, Alla Gorb, Oleg Korotchenkov, Andriy Nadtochiy, Oleksiy Polovina, Nadia Sigareva

Journal: Journal of Applied Polymer Science

Published in 2012

Fumed silica concentration effect on structure and dielectric properties of a styrene-cross-linked unsaturated polyester resin

Authors: B. M. Gorelov, O. I. Polovina, A. M. Gorb, S. Dacko, M. Kostrzewa, A. Ingram

Journal: Journal of Applied Physics