The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics
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) descri...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2021-08-01
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| Series: | Bulletin of the Polish Academy of Sciences: Technical Sciences |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/120481/PDF/02_02246_Bpast.No.69(5)_drukM.pdf |
| _version_ | 1811314148398596096 |
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| author | Sylwia Berdowska Janusz Berdowski Aubry Frederic |
| author_facet | Sylwia Berdowska Janusz Berdowski Aubry Frederic |
| author_sort | Sylwia Berdowska |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T11:06:43Z |
| format | Article |
| id | doaj.art-8f378337714644018a441ac079771464 |
| institution | Directory Open Access Journal |
| issn | 2300-1917 |
| language | English |
| last_indexed | 2024-04-13T11:06:43Z |
| publishDate | 2021-08-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Bulletin of the Polish Academy of Sciences: Technical Sciences |
| spelling | doaj.art-8f378337714644018a441ac0797714642022-12-22T02:49:15ZengPolish Academy of SciencesBulletin of the Polish Academy of Sciences: Technical Sciences2300-19172021-08-01695https://doi.org/10.24425/bpasts.2021.138235The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristicsSylwia Berdowska0Janusz Berdowski1Aubry Frederic2Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Częstochowa, PolandFaculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Częstochowa, PolandMaitrise de Chimie-Physique, Université Henri Poincaré, Nancy, FranceThe 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.https://journals.pan.pl/Content/120481/PDF/02_02246_Bpast.No.69(5)_drukM.pdfacoustic emissionspectrum distributionanisotropic structurepolyfurfuryl alcoholcompressed expanded graphitecomposite membrane |
| spellingShingle | Sylwia Berdowska Janusz Berdowski Aubry Frederic The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics Bulletin of the Polish Academy of Sciences: Technical Sciences acoustic emission spectrum distribution anisotropic structure polyfurfuryl alcohol compressed expanded graphite composite membrane |
| title | The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics |
| title_full | The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics |
| title_fullStr | The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics |
| title_full_unstemmed | The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics |
| title_short | The relationship between the structural anisotropy of the PFA polymer/compressed expanded graphite-matrix composites and acoustic emission characteristics |
| title_sort | relationship between the structural anisotropy of the pfa polymer compressed expanded graphite matrix composites and acoustic emission characteristics |
| topic | acoustic emission spectrum distribution anisotropic structure polyfurfuryl alcohol compressed expanded graphite composite membrane |
| url | https://journals.pan.pl/Content/120481/PDF/02_02246_Bpast.No.69(5)_drukM.pdf |
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