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Structural, thermal, and mechanical characterisation of PEEK-based composites in cryogenic temperature
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Portugal.ORCID iD: 0000-0002-8025-5104
CEMMPRE, Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal.
CEMMPRE, Department of Chemical Engineering, University of Coimbra, Coimbra, Portugal.
CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Portugal.
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2023 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 125, article id 108139Article in journal (Refereed) Published
Abstract [en]

Thermal, thermo-mechanical and mechanical properties of four different commercially available polyetheretherketones (PEEK) based materials were investigated. PEEK matrix was either modified and/or reinforced with carbon fibres, graphite and/or PTFE. Impact strength was measured at three different temperatures: 25 °C, −100 °C, and −195 °C. At 25 °C, thermal stability and mechanical properties, including the elastic modulus, compression, and impact strength, were enhanced with the addition of carbon fibres. Matrix modification had a minor impact on thermal stability, while the mechanical properties decreased, except for impact strength. At −100 °C, the mechanical properties of the neat polymers were improved, including increased impact strength by 20% compared to values at 25 °C. Addition of fillers hindered the rise of impact strength due to complex mechanisms caused by different coefficients of thermal expansion of reinforcements and matrix. At −195 °C, the significant increase of impact strength was revealed for unmodified PEEK reaching 30 times higher values than at 25 °C, while matrix modification suppressed the rise of impact strength. The scratch test indicated the superior behaviour of unfilled PEEK during the tested load range (up to 15 N), while the effect of the fillers was observed at much lower load threshold of 7 N.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 125, article id 108139
Keywords [en]
Cryogenic temperature, Fractography, Impact behaviour, Polymer-matrix composites (PMCs), Thermal properties
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Polymer Technologies
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-99484DOI: 10.1016/j.polymertesting.2023.108139ISI: 001048242600001Scopus ID: 2-s2.0-85164561685OAI: oai:DiVA.org:ltu-99484DiVA, id: diva2:1787079
Funder
EU, Horizon 2020, 860246
Note

Validerad;2023;Nivå 2;2023-08-11 (hanlid)

Available from: 2023-08-11 Created: 2023-08-11 Last updated: 2024-03-07Bibliographically approved

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Nikonovich, MaksimEmami, Nazanin

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