Electron Spin Resonance Study on Plasma-Induced Surface Radicals of Ethylene-Tetrafluoroethylene Copolymer.
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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: <I>g</I>=2.0029, <I>N</I><SUB>α</SUB>=2.19 mT (1H), <I>H</I><SUB>β</SUB>=2.88 mT (2H), and <I>F</I><SUB>β</SUB>=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.
- 社団法人 高分子学会の論文
社団法人 高分子学会 | 論文
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