Heavy ion beam induced phenomena in polytetrafluoroethylene

Akihiro Oshima, Katsuyoshi Murata, Toshitaka Oka, Nozomi Miyoshi, Akio Matsuura, Hisaaki Kudo, Takeshi Murakami, Etsuko Katoh, Masakazu Washio, Yoshimasa Hama

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    This paper describes the results on thermal and chemical analysis of polytetrafluoroethylene (PTFE) film stack after high-energy heavy ion beam irradiation under atmospheric fields at room temperature. After high-energy C6+ ion beam irradiation, the PTFE film stack was separated one by one, and then the various measurements such as differential scanning calorimetric (DSC) analysis and solid-state 19F magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy were performed to get information of the chemical reaction and structural change at the localized positions. By ion beam irradiation for PTFE at room temperature, it is suggested that the abnormal phenomena due to the change of morphology could be observed by DSC analysis. In the solid-state 19F-MAS-NMR spectroscopy of ion irradiated PTFE film including Bragg peak region, several new signals were observed besides the intense peak of -CF2- at -124 ppm. The detected new signals in ion irradiated PTFE should be due to the changed chemical structures. The signals, which are assigned, to the tertiary carbon group with branching site (Y-type crosslinking site), perfluoro-propylene site and chain end methyl site were directly detected, though it was under the oxidation condition. Thus, although it was under the oxidation condition, the branching or crosslinking reaction was taken place with the chain scission in the matrix. Moreover, the branched chain length would become short, compared with EB-crosslinked PTFE. Hence, it could be suggested that the irradiation of heavy ion beam induced large amounts of intermediate species, compared with EB or γ-ray irradiation, and then, those would be reacted with each other in the localized area. Especially, in region of the Bragg peak, the ion beam induced more large amounts of intermediate species than in the other region.

    Original languageEnglish
    Pages (from-to)314-319
    Number of pages6
    JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    Volume265
    Issue number1
    DOIs
    Publication statusPublished - 2007 Dec

    Fingerprint

    Heavy Ions
    polytetrafluoroethylene
    Polytetrafluoroethylene
    Heavy ions
    Polytetrafluoroethylenes
    Ion beams
    heavy ions
    ion beams
    Irradiation
    irradiation
    Magic angle spinning
    magnetic resonance spectroscopy
    crosslinking
    Crosslinking
    metal spinning
    Nuclear magnetic resonance spectroscopy
    Ions
    solid state
    Scanning
    Oxidation

    Keywords

    • F-MAS-NMR
    • Bragg peak
    • C ion beam
    • DSC
    • LET
    • PTFE
    • Tertiary carbon

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Instrumentation
    • Surfaces and Interfaces

    Cite this

    Heavy ion beam induced phenomena in polytetrafluoroethylene. / Oshima, Akihiro; Murata, Katsuyoshi; Oka, Toshitaka; Miyoshi, Nozomi; Matsuura, Akio; Kudo, Hisaaki; Murakami, Takeshi; Katoh, Etsuko; Washio, Masakazu; Hama, Yoshimasa.

    In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 265, No. 1, 12.2007, p. 314-319.

    Research output: Contribution to journalArticle

    Oshima, Akihiro ; Murata, Katsuyoshi ; Oka, Toshitaka ; Miyoshi, Nozomi ; Matsuura, Akio ; Kudo, Hisaaki ; Murakami, Takeshi ; Katoh, Etsuko ; Washio, Masakazu ; Hama, Yoshimasa. / Heavy ion beam induced phenomena in polytetrafluoroethylene. In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2007 ; Vol. 265, No. 1. pp. 314-319.
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    abstract = "This paper describes the results on thermal and chemical analysis of polytetrafluoroethylene (PTFE) film stack after high-energy heavy ion beam irradiation under atmospheric fields at room temperature. After high-energy C6+ ion beam irradiation, the PTFE film stack was separated one by one, and then the various measurements such as differential scanning calorimetric (DSC) analysis and solid-state 19F magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy were performed to get information of the chemical reaction and structural change at the localized positions. By ion beam irradiation for PTFE at room temperature, it is suggested that the abnormal phenomena due to the change of morphology could be observed by DSC analysis. In the solid-state 19F-MAS-NMR spectroscopy of ion irradiated PTFE film including Bragg peak region, several new signals were observed besides the intense peak of -CF2- at -124 ppm. The detected new signals in ion irradiated PTFE should be due to the changed chemical structures. The signals, which are assigned, to the tertiary carbon group with branching site (Y-type crosslinking site), perfluoro-propylene site and chain end methyl site were directly detected, though it was under the oxidation condition. Thus, although it was under the oxidation condition, the branching or crosslinking reaction was taken place with the chain scission in the matrix. Moreover, the branched chain length would become short, compared with EB-crosslinked PTFE. Hence, it could be suggested that the irradiation of heavy ion beam induced large amounts of intermediate species, compared with EB or γ-ray irradiation, and then, those would be reacted with each other in the localized area. Especially, in region of the Bragg peak, the ion beam induced more large amounts of intermediate species than in the other region.",
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    AU - Oka, Toshitaka

    AU - Miyoshi, Nozomi

    AU - Matsuura, Akio

    AU - Kudo, Hisaaki

    AU - Murakami, Takeshi

    AU - Katoh, Etsuko

    AU - Washio, Masakazu

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    AB - This paper describes the results on thermal and chemical analysis of polytetrafluoroethylene (PTFE) film stack after high-energy heavy ion beam irradiation under atmospheric fields at room temperature. After high-energy C6+ ion beam irradiation, the PTFE film stack was separated one by one, and then the various measurements such as differential scanning calorimetric (DSC) analysis and solid-state 19F magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy were performed to get information of the chemical reaction and structural change at the localized positions. By ion beam irradiation for PTFE at room temperature, it is suggested that the abnormal phenomena due to the change of morphology could be observed by DSC analysis. In the solid-state 19F-MAS-NMR spectroscopy of ion irradiated PTFE film including Bragg peak region, several new signals were observed besides the intense peak of -CF2- at -124 ppm. The detected new signals in ion irradiated PTFE should be due to the changed chemical structures. The signals, which are assigned, to the tertiary carbon group with branching site (Y-type crosslinking site), perfluoro-propylene site and chain end methyl site were directly detected, though it was under the oxidation condition. Thus, although it was under the oxidation condition, the branching or crosslinking reaction was taken place with the chain scission in the matrix. Moreover, the branched chain length would become short, compared with EB-crosslinked PTFE. Hence, it could be suggested that the irradiation of heavy ion beam induced large amounts of intermediate species, compared with EB or γ-ray irradiation, and then, those would be reacted with each other in the localized area. Especially, in region of the Bragg peak, the ion beam induced more large amounts of intermediate species than in the other region.

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