Electron spin resonance study of the special features of plasma-induced radicals and their corresponding peroxy radicals in polytetrafluoroethylene

Kuzuya, Masayuki; Ito, Hideki; Kondo, Shinichi; Noda, Nao‐Aki; Noguchi, Akihiro

doi:10.1021/ma00025a010

Cited by 59 publications

(30 citation statements)

References 11 publications

(14 reference statements)

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“…27, No. 3,1995 Plasma-Induced Surface Radicals of ETFE formation of the cross-linked portion. Repetition of all the above reactions produces the highly cross-linked network at the polymer surface containing the immobilized DBS at the polymer surface.…”

Section: Nature Of Plasma-induced Etfe Radicalsmentioning

confidence: 99%

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Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene–Tetrafluoroethylene Copolymer

Kuzuya

Niwa

Noguchi

1995

Polym J

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ABSTRACT:We have undertaken Ar plasma irradiation on ethylene-tetrafluoroethylene (!: I) alternating copolymer (ETFE) powder, and the radicals formed were studied by electron spin resonance (ESR). The room temperature ESR spectrum of plasma-irradiated ETFE shows a six-line spectrum (sextet) similar to that of polyethylene (PE), due to a small difference in hyperfine splitting constant between ,'i-H and ,'i-F atom. Thus, the major radical formed was assigned to the midchain alkyl radical generated by hydrogen elimination. The ESR spectral parameters for a representative sextet deduced from the simulated spectra are as follows: g=2.0029, N,=2.19mT (!H), Hp= 2.88 mT (2H), and Fp = 2.80 mT (2F). It was also found that the sextet spectrum gradually turned toward a broad single-line spectrum as the plasma duration increased indicating the successive formation of dangling bond sites (DBS) due to the occurrence of cross-linked surface reaction.

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Section: Nature Of Plasma-induced Etfe Radicalsmentioning

confidence: 99%

“…The spectrum of plasma-irradiated PTFE powder consists essentially of the midchain alkyl radical (4), the endchain alkyl radical (5) and DBS (6), respectively. 3…”

mentioning

confidence: 99%

Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene–Tetrafluoroethylene Copolymer

Kuzuya

Niwa

Noguchi

1995

Polym J

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“…In order to make the surface of PTFE hydrophilic, we have to take fluorine out before adding hydrophilic functional groups. However, since the bond energy of C-F is fairly high, F is not easy to be removed [12]. As the first priority is extraction of F, not the addition Untreated Binding energy (eV) Figure 4.…”

Section: Surface Treatment Of Hdpe By Apc With Omentioning

confidence: 99%

Surface Treatment of Hydrophobic Polymers by Atmospheric-Pressure Plasma

Iriyama

2010

J. Photopol. Sci. Technol.

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“…For example, there is considerable interest in changing the surface hydrophobicity of polytetrafluoroethylene (PTFE) using treatments such as UV-radiation under vacuum at room temperature, which was studied by Rasoul et al, 14 or oxygen low-pressure plasma exposure examined by Vandencasteele et al, 15,16 Carbone et al, 17 and Milella et al 18 In addition, surface modification using atmospheric pressure He plasma was studied by Zettsu et al 19 Physical and chemical modification of the PTFE surface has also reported by other researchers. [20][21][22][23][24] Not only photochemical processes with plasma-induced emission, but also synergistic photo and radical processes play important roles in the utilization of plasma. Yuan et al very recently reported that photochemical reactions on poly(methyl methacrylate) occurred synergistically from exposure to vacuum ultraviolet (VUV) and atomic oxygen.…”

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confidence: 99%

Synergistic Formation of Radicals by Irradiation with Both Vacuum Ultraviolet and Atomic Hydrogen: A Real-Time In Situ Electron Spin Resonance Study

Ishikawa

Sumi

Kono

et al. 2011

J. Phys. Chem. Lett.

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We report on the surface modification of poly(tetrafluoroethylene) (PTFE) as an example of soft materials and biomaterials that occur under plasma discharge by kinetics analysis of radical formation using in situ real-time electron spin resonance (ESR) measurements. During irradiation with hydrogen plasma, simultaneous measurements of the gas-phase ESR signals of atomic hydrogen and the carbon dangling bond (C-DB) on PTFE were performed. Dynamic changes of the C-DB density were observed in real time, where the rate of density change was accelerated during initial irradiation and then became constant over time. It is noteworthy that C-DBs were formed synergistically by irradiation with both vacuum ultraviolet (VUV) and atomic hydrogen. The in situ real-time ESR technique is useful to elucidate synergistic roles during plasma surface modification.

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Electron spin resonance study of the special features of plasma-induced radicals and their corresponding peroxy radicals in polytetrafluoroethylene

Cited by 59 publications

References 11 publications

Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene–Tetrafluoroethylene Copolymer

Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene–Tetrafluoroethylene Copolymer

Surface Treatment of Hydrophobic Polymers by Atmospheric-Pressure Plasma

Synergistic Formation of Radicals by Irradiation with Both Vacuum Ultraviolet and Atomic Hydrogen: A Real-Time In Situ Electron Spin Resonance Study

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