Pre-irradiation induced grafting of styrene into crosslinked and non-crosslinked polytetrafluoroethylene films for polymer electrolyte fuel cell applications. II: Characterization of the styrene grafted films

Jingye Li, Kohei Sato, Shogo Ichizuri, Saneto Asano, Shigetoshi Ikeda, Minoru Iida, Akihiro Oshima, Yoneho Tabata, Masakazu Washio

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    Crosslinked and non-crosslinked polytetrafluoroethylene films (RX-PTFE and V-PTFE films, respectively) were irradiated by γ-ray and then grafted with styrene in liquid phase. Microscope FT-IR spectroscopy, TGA, solid state 13C CP/MAS and high resolution HS/MAS NMR spectroscopy, wide-angle X-ray diffraction (WAXD) study were used to get the structural information of the styrene grafted RX-PTFE and V-PTFE films. From microscope FT-IR spectra of the grafted RX-PTFE films, the "grafting front mechanism" was proved. TGA analysis showed that the grafted films have a small degradation step and two main degradation steps. In the 13C CP/MAS NMR spectra of the non-grafted films, there are no signal due to the absence of the hydrogen atom. While in the spectra of the grafted films, there are signals attributed to the polystyrene grafts. In the 13C HS/MAS NMR spectra of the grafted films, the relative intensity of the peaks attributed to the polystyrene grafts increased while the relative intensity of the peak attributed to PTFE matrix decreased with the increase in the DOG. From WAXD patterns, the intensity of the crystalline peak decrease with the increase in the DOG. The grafted films were sulfonated by chlorosulfonic acid and the results of highest IEC value exceeded 3.0. Those results will be reported in the near future.

    Original languageEnglish
    Pages (from-to)547-555
    Number of pages9
    JournalEuropean Polymer Journal
    Volume41
    Issue number3
    DOIs
    Publication statusPublished - 2005 Mar

    Fingerprint

    Styrene
    polytetrafluoroethylene
    Polytetrafluoroethylene
    Polytetrafluoroethylenes
    styrenes
    Electrolytes
    fuel cells
    Fuel cells
    Polymers
    Irradiation
    electrolytes
    irradiation
    polymers
    Polystyrenes
    Grafts
    nuclear magnetic resonance
    polystyrene
    Microscopes
    microscopes
    Nuclear magnetic resonance

    Keywords

    • Crosslinked and non-crosslinked polytetrafluoroethylene
    • Polymer electrolyte fuel cell
    • Pre-irradiation induced graft polymerization
    • Structure characterization

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics

    Cite this

    Pre-irradiation induced grafting of styrene into crosslinked and non-crosslinked polytetrafluoroethylene films for polymer electrolyte fuel cell applications. II : Characterization of the styrene grafted films. / Li, Jingye; Sato, Kohei; Ichizuri, Shogo; Asano, Saneto; Ikeda, Shigetoshi; Iida, Minoru; Oshima, Akihiro; Tabata, Yoneho; Washio, Masakazu.

    In: European Polymer Journal, Vol. 41, No. 3, 03.2005, p. 547-555.

    Research output: Contribution to journalArticle

    Li, Jingye ; Sato, Kohei ; Ichizuri, Shogo ; Asano, Saneto ; Ikeda, Shigetoshi ; Iida, Minoru ; Oshima, Akihiro ; Tabata, Yoneho ; Washio, Masakazu. / Pre-irradiation induced grafting of styrene into crosslinked and non-crosslinked polytetrafluoroethylene films for polymer electrolyte fuel cell applications. II : Characterization of the styrene grafted films. In: European Polymer Journal. 2005 ; Vol. 41, No. 3. pp. 547-555.
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    abstract = "Crosslinked and non-crosslinked polytetrafluoroethylene films (RX-PTFE and V-PTFE films, respectively) were irradiated by γ-ray and then grafted with styrene in liquid phase. Microscope FT-IR spectroscopy, TGA, solid state 13C CP/MAS and high resolution HS/MAS NMR spectroscopy, wide-angle X-ray diffraction (WAXD) study were used to get the structural information of the styrene grafted RX-PTFE and V-PTFE films. From microscope FT-IR spectra of the grafted RX-PTFE films, the {"}grafting front mechanism{"} was proved. TGA analysis showed that the grafted films have a small degradation step and two main degradation steps. In the 13C CP/MAS NMR spectra of the non-grafted films, there are no signal due to the absence of the hydrogen atom. While in the spectra of the grafted films, there are signals attributed to the polystyrene grafts. In the 13C HS/MAS NMR spectra of the grafted films, the relative intensity of the peaks attributed to the polystyrene grafts increased while the relative intensity of the peak attributed to PTFE matrix decreased with the increase in the DOG. From WAXD patterns, the intensity of the crystalline peak decrease with the increase in the DOG. The grafted films were sulfonated by chlorosulfonic acid and the results of highest IEC value exceeded 3.0. Those results will be reported in the near future.",
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    AU - Li, Jingye

    AU - Sato, Kohei

    AU - Ichizuri, Shogo

    AU - Asano, Saneto

    AU - Ikeda, Shigetoshi

    AU - Iida, Minoru

    AU - Oshima, Akihiro

    AU - Tabata, Yoneho

    AU - Washio, Masakazu

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    AB - Crosslinked and non-crosslinked polytetrafluoroethylene films (RX-PTFE and V-PTFE films, respectively) were irradiated by γ-ray and then grafted with styrene in liquid phase. Microscope FT-IR spectroscopy, TGA, solid state 13C CP/MAS and high resolution HS/MAS NMR spectroscopy, wide-angle X-ray diffraction (WAXD) study were used to get the structural information of the styrene grafted RX-PTFE and V-PTFE films. From microscope FT-IR spectra of the grafted RX-PTFE films, the "grafting front mechanism" was proved. TGA analysis showed that the grafted films have a small degradation step and two main degradation steps. In the 13C CP/MAS NMR spectra of the non-grafted films, there are no signal due to the absence of the hydrogen atom. While in the spectra of the grafted films, there are signals attributed to the polystyrene grafts. In the 13C HS/MAS NMR spectra of the grafted films, the relative intensity of the peaks attributed to the polystyrene grafts increased while the relative intensity of the peak attributed to PTFE matrix decreased with the increase in the DOG. From WAXD patterns, the intensity of the crystalline peak decrease with the increase in the DOG. The grafted films were sulfonated by chlorosulfonic acid and the results of highest IEC value exceeded 3.0. Those results will be reported in the near future.

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