Heavy ion beam induced phenomena in polytetrafluoroethylene

Oshima, Akira; Murata, Kei; Oka, Toshitaka; Miyoshi, Nozomi; Matsuura, Akio; Kudo, Hiroyuki; Murakami, Takeshi; Katoh, Etsuko; Washio, Masakazu; Hama, Yoshimasa

doi:10.1016/j.nimb.2007.08.072

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Together with its base polymer polyethylene (PE) several studies on ion beam effects have been carried out beforehand. [3][4][5][6][7][8][9] ETFE (ethylene-tetrauoroethylene) with only half of the hydrogen atoms replaced by uorine is another kind of uoropolymer which is well known for its excellent thermal and chemical stability as well as mechanical properties. On ETFE, the number of ion beam studies is quite limited.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on degradation characteristics of fluoropolymers irradiated by high energy heavy ions

2014

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Section: Introductionmentioning

confidence: 99%

A comparative study on degradation characteristics of fluoropolymers irradiated by high energy heavy ions

2014

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“…It is made up of carbon backbone chains, and each carbon has two fluorine atoms attached to it. [36][37][38][39][40][41][42][43] However, very less data is available on ion beam modification of structural, optical, and chemical properties of PTFE. The simplest way of representing the repeating units is (-CF 2 -CF 2 -) n .…”

Section: Introductionmentioning

confidence: 99%

“…The results of neutron and gamma irradiations on Teflon are reported in the literature . A good amount of literature is available on ion beam modification of surface and electrical properties of PTFE . However, very less data is available on ion beam modification of structural, optical, and chemical properties of PTFE .…”

Section: Introductionmentioning

confidence: 99%

Influence of High‐Energy Ion Irradiation on the Structural, Optical, and Chemical Properties of Polytetrafluoroethylene

Singh

Kumar

2014

Adv Polym Technol

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Polytetrafluoroethylene (PTFE) polymer samples were irradiated by 50 MeV Li 3+ ion beams to the fluences of 1 × 10 10 , 1 × 10 11 , and 1 × 10 12 ions/cm 2 . The structural, optical, and chemical properties were studied by X-ray diffraction (XRD), UV-visible (UV-vis) spectroscopy, and Fourier transform infrared (FTIR) spectroscopy, respectively. The XRD analyses showed amorphization of the polymer sample at fluences of 1 × 10 10 and 1 × 10 11 ions/cm 2 . Crystallite size (calculated by applying the Scherrer formula) decreased for irradiated samples at fluences of 1 × 10 10 and 1 × 10 11 ions/cm 2 . The other factors like microstrain (ε), dislocation density (δ), and distortion parameters (g) showed variations at these fluences. However, there was no change in the interchain separation (R) and interplanar distance (d) for all irradiated samples. UV-vis showed a shift of the absorption edge of irradiated samples towards the visible region. The band gap energy (E g ) was calculated using Tauc's relation, and its value decreased with an increase of ion fluence for all irradiated samples. The number of carbon atoms per conjugation length (N) increased for the irradiated samples. The FTIR results revealed the liberation of CF 2 groups and the appearance of some new bands after irradiation. C

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“…Such structural reorganization can lead to loss of the mechanical stability of PTFE. The study of PTFE film stack after high-energy heavy ion beam irradiation under atmospheric fields at room temperature found that the irradiation of heavy ion beam induced large amounts of intermediate species [11] . Briscoe et al [1] described some of the effect of gamma (γ) irradiation on the pneumatic pressure dependence of the well established room temperature transition in PTFE.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of polytetrafluoroethylene coatings based on LY12 substrates in the space environment

Yuan

Liu

Yang

et al. 2014

J. Shanghai Jiaotong Univ. (Sci.)

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The spacecraft space radiation environment was simulated by 60 Co source. The polytetrafluoroethylene (PTFE) coatings were fabricated on LY12 substrates. And the effect of gamma (γ) irradiation on the tribological behavior of PTFE coatings under vacuum conditions was investigated. Results indicate that the radiation dose has insignificant effect on the friction coefficient of PTFE coatings, and the wear of PTFE coatings reduces with the increase of gamma dose. As the gamma dose was 100 kGy, the friction coefficient of the PTFE coatings first increased with the increase of sliding velocity and then decreased, and the wear of the PTFE coatings decreased with the increase of sliding speed. As the gamma dose was 100 kGy, the friction coefficient of the PTFE coatings first decreased with the increase of load and then increased, and the wear rate of PTFE coatings increased with the increase of load. Scanning electron microscope was utilized.

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Heavy ion beam induced phenomena in polytetrafluoroethylene

Cited by 14 publications

References 14 publications

A comparative study on degradation characteristics of fluoropolymers irradiated by high energy heavy ions

A comparative study on degradation characteristics of fluoropolymers irradiated by high energy heavy ions

Influence of High‐Energy Ion Irradiation on the Structural, Optical, and Chemical Properties of Polytetrafluoroethylene

Tribological behavior of polytetrafluoroethylene coatings based on LY12 substrates in the space environment

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