The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics

• Autorzy: Berdowska Sylwia , Berdowski Janusz , Aubry Frederic

Identyfikatory

DOI

10.24425/bpasts.2021.138235

• Języki publikacji: EN

Abstrakty

EN

The main aim of the study was to search for the relationship between the anisotropy of the structure of polyfurfuryl alcohol (PFA) – polymer/compressed expanded graphite (CEG)-matrix composites at subsequent stages of the technological process and characteristics of the acoustic emission (AE) descriptors. These composites, obtained after successive technological procedures of impregnation, polymerization, and carbonization, possess different structure, densities, porosity, and other physicochemical properties. In the structures of composites prepared on the basis of CEG, two basic directions can be distinguished: parallel to the bedding plane of graphite sheets and perpendicular to it. The measurements were carried out for the stress acting in these two main directions. The investigation has shown that the AE method enables the detection of anisotropy in the structure of materials. The results of the research show that all four of the acoustic emission descriptors studied in this work are sensitive to the technological stages of these materials on the one hand and their structure anisotropy on the other. Fourier analysis of the recorded spectra provides interesting conclusions about the structural properties of composites as well as a lot of information about the bonding forces between the carbon atoms of which the CEG matrix is composed and the PFA polymer or turbostratic carbon.

Słowa kluczowe

EN

acoustic emission; spectrum distribution; anisotropic structures; polyfurfuryl alcohol; compressed expanded graphite; composite membrane

PL

emisja akustyczna; rozkład widma; struktura anizotropowa; alkohol polifurfurylowy; grafit ekspandowany prasowany; membrana kompozytowa

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2021
• Tom: Vol. 69, nr 5
• Strony: art. no. e138235
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Berdowska Sylwia

• Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Częstochowa, Poland

• https://orcid.org/0000-0002-1449-0982

autor

Berdowski Janusz

• Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Częstochowa, Poland
• Faculty of Science and Technology, J. Dlugosz University in Czestochowa, Al. Armii Krajowej 13/15, 42-200 Częstochowa, Poland

• https://orcid.org/0000-0001-8255-5330

autor

Aubry Frederic

• Maitrise de Chimie-Physique, Université Henri Poincaré, Nancy, France

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