Photodegradation of PEEK sheets under tensile stress

Nakamura, Hiroshi; Nakamura, Takashi; Noguchi, Tōru; Imagawa, Kichiro

doi:10.1016/j.polymdegradstab.2005.06.003

Cited by 64 publications

(31 citation statements)

References 25 publications

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“…This observation is fully in line with Nakamura et al [10], who investigated PEEK after UVexposure using FTIR and found strong degradation of the polymer structure. Consequently, high-energy electromagnetic radiation, such as UV, is suggested as the main contributor to PEEK degradation.…”

Section: Solar Absorptancesupporting

confidence: 91%

Space Environmental Testing of Novel Candidate Materials for Multilayer Insulation

Möser¹,

Ranzenberger²,

Duzellier

2016

Journal of Spacecraft and Rockets

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Multilayer insulation forms the outer barrier of a satellite towards space. Polymer foils used in multilayer insulation have to withstand the space environment for mission durations often lasting well above 10 years. This paper outlines the space environmental test campaign performed to qualify novel and advanced polymer foils to reduce blanket mass and replace export-controlled materials. Complete multilayer insulation layups were irradiated; these were composed of thicker outermost layers of the reference material Kapton ® , a white polyimide and an alternative, conductive black polyimide and up to seven thin internal, aluminized 6 μm or 3 μm polyethylene terephthalate and polyethylene naphthalate layers separated by nonwoven spacers. One sample set consisted of 25 μm polyether-etherketone foil and 6 μm internal vacuum-deposited-aluminum-coated polyether-ether-ketone layers. Materials were exposed to ultraviolet, electrons and protons simulating a 15-year geostationary orbit mission. Absorptance was measured at various stages in situ during the exposures, and emittance was measured ex situ at the beginning and end of the test. With tensile testing, exposure influence on foil mechanical properties was determined and compared with pristine and reference materials. Although the white polyimide was sensitive to ultraviolet and showed strong degradation after ultraviolet and proton exposure, degradation of all other materials was within expected limits and compatible to state-of-the-art foils.

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Section: Solar Absorptancesupporting

confidence: 91%

Space Environmental Testing of Novel Candidate Materials for Multilayer Insulation

Möser¹,

Ranzenberger²,

Duzellier

2016

Journal of Spacecraft and Rockets

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“…Table 5 shows the relative component percentages of the C 1s XPS high resolution spectra of all samples. The C 1s peak was fitted with peaks located at previously reported binding energies 26, 27. Peaks were located at 285 eV (CC/H), at 286.4 eV(CO/N), at 288.1 eV (CO) and 289 eV(COO/N).…”

Section: Resultsmentioning

confidence: 99%

Plasma Activation and Self Bonding of PEEK for the Use in the Encapsulation of Medical Implants

Awaja

Zhang

James

et al. 2010

Plasma Processes & Polymers

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Polyether ether ketone (PEEK) and its composites have emerged as one of the main candidate materials for replacing titanium and its alloys for the encapsulating components of medical implants. PEEK, however, is a difficult material to bond without the use of adhesion promoting agents. Experiments based on the central composite rotatable design (CCRD) were used to find an optimum plasma surface modification treatment. X‐ray photoelectron spectrometry (XPS), contact angle measurements and scanning electron microscopy (SEM) were used to provide surface molecular and thermodynamic information. Higher self bond strength of PEEK was found to correlate with higher relative oxygen concentration and total surface energy. Mechanisms for the autohesive bond formation were developed based on the oxidation of the surface.

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“…Random chain scission at the ether and ketone linkages must occur first to generate stable radicals intermediates [33,34]. Dehydrogenation has been shown to be affected by thermal treatment [35,36], UV treatment [32,37,38], ion irradiation [31]. The relative decrease in the peak intensity at 1226 cm -1 and the relative intensity increase of peaks at 1653, 1599, and 1493 cm -1 observed in this work (peaks between zones 3 and 4, Figure 6) have been attributed to a change in chemical bonding due to plasma treatment [9] and melting [35,39].…”

Section: Analysis Based On Ftir Spectramentioning

confidence: 99%

Properties of Polyetheretherketone (PEEK) transferred materials in a PEEK-steel contact

Puhan

Wong

2019

Tribology International

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Polyetheretherketone (PEEK) is a high performance polymer that can be an alternative to metal for some moving components in unlubricated conditions. During rubbing, PEEK is transferred to the counterface. The formation and properties of PEEK transfer films on steel and sapphire are studied by in-situ observations of PEEK wear process, contact temperatures and triboemission, as well as FTIR and Raman spectroscopies ex situ. Our results suggest that frictional heating alone may not be sufficient to generate PEEK degradation observed in the transfer materials. Triboplasma observed during rubbing, together with the mechanical shear, may promote generations of radicals and degradation of PEEK, which subsequently influence the properties of PEEK transfer film and performance of polymer-metal tribopair.

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Photodegradation of PEEK sheets under tensile stress

Cited by 64 publications

References 25 publications

Space Environmental Testing of Novel Candidate Materials for Multilayer Insulation

Space Environmental Testing of Novel Candidate Materials for Multilayer Insulation

Plasma Activation and Self Bonding of PEEK for the Use in the Encapsulation of Medical Implants

Properties of Polyetheretherketone (PEEK) transferred materials in a PEEK-steel contact

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