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Structural and Dipole-Relaxation Processes in Epoxy-Multilayer Graphene Composites with Low Filler Content.
Gorelov, Borys M; Mischanchuk, Oleksandr V; Sigareva, Nadia V; Shulga, Sergey V; Gorb, Alla M; Polovina, Oleksiy I; Yukhymchuk, Volodymyr O.
Afiliación
  • Gorelov BM; Department of Composite Materials, Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, 03164 Kyiv, Ukraine.
  • Mischanchuk OV; Department of Composite Materials, Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, 03164 Kyiv, Ukraine.
  • Sigareva NV; Department of Composite Materials, Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, 03164 Kyiv, Ukraine.
  • Shulga SV; Department of Composite Materials, Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, 03164 Kyiv, Ukraine.
  • Gorb AM; Faculty of Physics, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine.
  • Polovina OI; Faculty of Physics, Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine.
  • Yukhymchuk VO; Department of Optics and Spectroscopy of Semiconductor and Dielectric Materials, V. Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine, 03028 Kyiv, Ukraine.
Polymers (Basel) ; 13(19)2021 Sep 30.
Article en En | MEDLINE | ID: mdl-34641174
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Polymers (Basel) Año: 2021 Tipo del documento: Article País de afiliación: Ucrania Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Polymers (Basel) Año: 2021 Tipo del documento: Article País de afiliación: Ucrania Pais de publicación: Suiza