Abstract
We have undertaken Ar plasma irradiation on ethylene–tetrafluoroethylene (1:1) 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 β-H and β-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, Nα=2.19 mT (1H), Hβ=2.88 mT (2H), and Fβ=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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Kuzuya, M., Niwa, J. & Noguchi, T. Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene–Tetrafluoroethylene Copolymer. Polym J 27, 251–255 (1995). https://doi.org/10.1295/polymj.27.251
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DOI: https://doi.org/10.1295/polymj.27.251
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