Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Kornacka, Ewa; Przybytniak, G.; Nowicki, Andrzej

doi:10.1002/pat.4445

Cited by 15 publications

(7 citation statements)

References 28 publications

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“…Irradiated samples show an overall decline of their thermal stability. Under nitrogen atmosphere, the temperature position of peak maximum and peak intensity of the primary degradation decrease with an increasing dose which is consistent with the study of Kornacka [12]. An increase in the peak width with dose is also observed.…”

Section: Thermal Stability Of Pristine and Irradiated Samplessupporting

confidence: 90%

“…This increase is observed as well by dielectric measurements which also brought into evidence a wider relaxation time distribution [11]. More recently, Kornacka et al investigated the effect of electronic irradiations on PEEK in order to identify radical compounds formed during ageing [12]. They also observed a decrease in thermal stability.…”

Section: Introductionmentioning

confidence: 70%

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Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Rival

Paulmier

Dantras

2019

Polymer Degradation and Stability

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Polymer materials used in satellite manufacturing are exposed to severe environmental conditions. Irradiation by high-energy electrons induces chemical modifications of macromolecules. Poly-EtherEtherKetone (PEEK) is used in space industry and therefore, its behaviour regarding electronic irradiations has to be studied. Thus, the aim of this work is to investigate the effect of experimental electronic irradiations on the physical and chemical structure of PEEK. In this way, PEEK films were irradiated under high vacuum by a mono-energetic electron beam. Doses deposited are representatives of 15 years in geostationary electronic environment. The study of irradiated samples revealed modifications of the chemical and physical structures. Irradiation predominantly induces cross-linking phenomena in the amorphous phase in front of chain scission phenomena. Irradiation also leads to a decrease in crystallite size and crystallinity ratio.

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Section: Thermal Stability Of Pristine and Irradiated Samplessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 70%

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Rival

Paulmier

Dantras

2019

Polymer Degradation and Stability

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“…Low-energy proton irradiation has a great effect on the molecular structure of PEEK materials. It has been shown that heavy ion irradiation can destroy benzene rings and generate a large number of aromatic fragments according to the references [ 26 ]. It can be inferred that the low-energy proton irradiation will destroy the carbon skeleton of the benzene ring in the molecular structure of PEEK, resulting in the decrease of C=O and benzene content in PEEK.…”

Section: Resultsmentioning

confidence: 99%

Study on the Microstructure of Polyether Ether Ketone Films Irradiated with 170 keV Protons by Grazing Incidence Small Angle X-ray Scattering (GISAXS) Technology

Yang

Tian

et al. 2020

Polymers

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Polyether ether ketone (PEEK) films irradiated with 170 keV protons were calculated by the stopping and ranges of ions in matter (SRIM) software. The results showed that the damage caused by 170 keV protons was only several microns of the PEEK surface, and the ionization absorbed dose and displacement absorbed dose were calculated. The surface morphology and roughness of PEEK after proton irradiation were studied by atomic force microscope (AFM). GISAXS was used to analyze the surface structural information of the pristine and irradiated PEEK. The experimental results showed that near the surface of the pristine and irradiated PEEK exists a peak, and the peak gradually disappeared with the increasing of the angles of incidence and the peak changed after irradiation, which implies the 170 keV protons have an effect on PEEK structure. The influences of PEEK irradiated with protons on the melting temperature and crystallization temperature was investigated by differential scanning calorimetry (DSC). The DSC results showed that the crystallinity of the polymer after irradiation decreased. The structure and content of free radicals of pristine and irradiated PEEK were studied by Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance (EPR). The stress and strain test results showed that the yield strength of the PEEK irradiated with 5 × 1015 p/cm2 and 1 × 1016 p/cm2 was higher than the pristine, but the elongation at break of the PEEK irradiated with 5 × 1015 p/cm2 and 1 × 1016 p/cm2 decreased obviously.

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“…16 The subsequent transient chemical reactions of highly reactive species will lead to creation of excessive double bonds, 17 production of low mass stable degradation products, large cross-linked structures and eventually oxidized structures. 18,19 As an important polymer material for space applications, it is necessary to study the radiation effects of charged particles. Since its first commercialized by Imperial Chemical Industries in 1978, numerous studies have focused on the behavior of PEEK and its composites under different radiation sources such as electrons, protons, gamma rays, ultraviolet light or under combined aging.…”

Section: Introductionmentioning

confidence: 99%

“…In the specific case of electronic irradiations, Sasuga et al 20 studied the mechanical behavior evolution of irradiated samples. More recently, Kornacka et al 19 investigated the effect of electronic irradiations on PEEK in order to identify radical compounds formed during aging. So far, there have been few literatures on the ion irradiation effect of PEEK.…”

Section: Introductionmentioning

confidence: 99%

Influence of 25 MeV Si ions and 25 MeV O ions on the chemical and structural properties of PEEK films

Yang

2020

High Performance Polymers

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Poly (ether ether ketone) (PEEK) material can be used in a wide variety of fields, such as the aerospace, automotive, electronics, and nuclear industries. In this research, the irradiation effect of 25 MeV Si ions and 25 MeV O ions on the PEEK films was studied, focusing on the changes in chemical and structural properties. By analyzing surface morphology and microstructure evolution of the PEEK films after 25 MeV Si ion and 25 MeV O ion irradiation, particles were generated on surface of the PEEK after 25 MeV Si ion irradiation and black dots were generated on surface of the PEEK after 25 MeV O ion irradiation. The irradiation reduced the surface roughness of the PEEK films from the atomic force microscopy (AFM) results. The Fourier transform infrared (FTIR) results indicated that the groups and structure of the material were not changed by irradiation. The X-ray photoelectron spectroscopy (XPS) results showed that the contents of the chemical bonds C–C, C=O increased first and then decreased with the increasing of the fluences. The generated free radicals were observed by the electron paramagnetic resonance spectroscopy (EPR) at room temperature and the irradiation degradation mechanisms were analyzed. Thermal properties of the PEEK irradiated by 25 MeV O ions, indicating that a new secondary crystallization peak was found during the cooling stage. Consequently, the low fluences irradiation improves in the viscoelasticity and mechanical properties of PEEK films, while the high fluences irradiation reduces its performance.

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Radical processes initiated by ionizing radiation in PEEK and their macroscopic consequences

Cited by 15 publications

References 28 publications

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Influence of electronic irradiations on the chemical and structural properties of PEEK for space applications

Study on the Microstructure of Polyether Ether Ketone Films Irradiated with 170 keV Protons by Grazing Incidence Small Angle X-ray Scattering (GISAXS) Technology

Influence of 25 MeV Si ions and 25 MeV O ions on the chemical and structural properties of PEEK films

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