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Characterization of thermally aged polyetheretherketone fibres: Mechanical, thermal, rheological and chemical property changes

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Characterization of thermally aged polyetheretherketone fibres : Mechanical, thermal, rheological and chemical property changes. / Mylläri, Ville; Ruoko, Tero-Petri; Vuorinen, Jyrki; Lemmetyinen, Helge.

In: Polymer Degradation and Stability, Vol. 120, 01.10.2015, p. 419-426.

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Mylläri, Ville ; Ruoko, Tero-Petri ; Vuorinen, Jyrki ; Lemmetyinen, Helge. / Characterization of thermally aged polyetheretherketone fibres : Mechanical, thermal, rheological and chemical property changes. In: Polymer Degradation and Stability. 2015 ; Vol. 120. pp. 419-426.

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@article{62750e4ac62e42e893a93d1ba3c87e71,
title = "Characterization of thermally aged polyetheretherketone fibres: Mechanical, thermal, rheological and chemical property changes",
abstract = "This paper investigates the effects of thermal degradation on polyetheretherketone (PEEK) fibres. PEEK samples were aged at a constant temperature of 250 °C for 1-128 days and characterized with mechanical tests, FTIR (Fourier Transform Infrared Spectroscopy), DSC (Differential Scanning Calorimetry), rheology, TGA (Thermogravimetric Analysis), SEM (Scanning Electron Microscopy), and UV-Vis diffuse reflectance spectroscopy. The short-term thermal annealing had a positive effect on the mechanical properties, due to the formation and growth of secondary crystals. Crosslinking in the material was verified by rheological inspections. The crosslinking increased the mechanical strength and modulus but reduced the elongation at break of the fibres. FTIR tests showed that carbonyl and hydroxyl groups were slowly formed on the surface of the fibres while ring opening reactions took place. The thermal ageing reduced the thermal stability of PEEK. The decreased stability was observed in the decomposition onset temperature after 8 d and in the melting point and the glass transition temperature after 32 d. The first signs of degradation, crosslinking, embrittlement, and reduced thermal stability, were visible roughly after 8 d of ageing, whereas the deterioration in general usability occurred after 64 d.",
keywords = "Fibre, PEEK, Thermal degradation",
author = "Ville Myll{\"a}ri and Tero-Petri Ruoko and Jyrki Vuorinen and Helge Lemmetyinen",
note = "ORG=mol,0.75 ORG=keb,0.25 24 kk embargo (post-print)",
year = "2015",
month = "10",
day = "1",
doi = "10.1016/j.polymdegradstab.2015.08.003",
language = "English",
volume = "120",
pages = "419--426",
journal = "Polymer Degradation and Stability",
issn = "0141-3910",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Characterization of thermally aged polyetheretherketone fibres

T2 - Mechanical, thermal, rheological and chemical property changes

AU - Mylläri, Ville

AU - Ruoko, Tero-Petri

AU - Vuorinen, Jyrki

AU - Lemmetyinen, Helge

N1 - ORG=mol,0.75 ORG=keb,0.25 24 kk embargo (post-print)

PY - 2015/10/1

Y1 - 2015/10/1

N2 - This paper investigates the effects of thermal degradation on polyetheretherketone (PEEK) fibres. PEEK samples were aged at a constant temperature of 250 °C for 1-128 days and characterized with mechanical tests, FTIR (Fourier Transform Infrared Spectroscopy), DSC (Differential Scanning Calorimetry), rheology, TGA (Thermogravimetric Analysis), SEM (Scanning Electron Microscopy), and UV-Vis diffuse reflectance spectroscopy. The short-term thermal annealing had a positive effect on the mechanical properties, due to the formation and growth of secondary crystals. Crosslinking in the material was verified by rheological inspections. The crosslinking increased the mechanical strength and modulus but reduced the elongation at break of the fibres. FTIR tests showed that carbonyl and hydroxyl groups were slowly formed on the surface of the fibres while ring opening reactions took place. The thermal ageing reduced the thermal stability of PEEK. The decreased stability was observed in the decomposition onset temperature after 8 d and in the melting point and the glass transition temperature after 32 d. The first signs of degradation, crosslinking, embrittlement, and reduced thermal stability, were visible roughly after 8 d of ageing, whereas the deterioration in general usability occurred after 64 d.

AB - This paper investigates the effects of thermal degradation on polyetheretherketone (PEEK) fibres. PEEK samples were aged at a constant temperature of 250 °C for 1-128 days and characterized with mechanical tests, FTIR (Fourier Transform Infrared Spectroscopy), DSC (Differential Scanning Calorimetry), rheology, TGA (Thermogravimetric Analysis), SEM (Scanning Electron Microscopy), and UV-Vis diffuse reflectance spectroscopy. The short-term thermal annealing had a positive effect on the mechanical properties, due to the formation and growth of secondary crystals. Crosslinking in the material was verified by rheological inspections. The crosslinking increased the mechanical strength and modulus but reduced the elongation at break of the fibres. FTIR tests showed that carbonyl and hydroxyl groups were slowly formed on the surface of the fibres while ring opening reactions took place. The thermal ageing reduced the thermal stability of PEEK. The decreased stability was observed in the decomposition onset temperature after 8 d and in the melting point and the glass transition temperature after 32 d. The first signs of degradation, crosslinking, embrittlement, and reduced thermal stability, were visible roughly after 8 d of ageing, whereas the deterioration in general usability occurred after 64 d.

KW - Fibre

KW - PEEK

KW - Thermal degradation

UR - http://www.scopus.com/inward/record.url?scp=84942433318&partnerID=8YFLogxK

U2 - 10.1016/j.polymdegradstab.2015.08.003

DO - 10.1016/j.polymdegradstab.2015.08.003

M3 - Article

VL - 120

SP - 419

EP - 426

JO - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

SN - 0141-3910

ER -