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Structural, thermal, and mechanical characterisation of PEEK-based composites in cryogenic temperature by Maksim Nikonovich; Joana F.S. Costa; Ana C. Fonseca; Amilcar Ramalho; Nazanin Emami is a scholarly article available to read on EtoBox.

What is Structural, thermal, and mechanical characterisation of PEEK-based composites in cryogenic temperature about?

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 be

Author

Maksim Nikonovich; Joana F.S. Costa; Ana C. Fonseca; Amilcar Ramalho; Nazanin Emami

Publisher

Elsevier BV

Published

2023

Language

EN