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- W2049829356 abstract "Abstract Temperature‐dependent electron spin resonance spectra of main‐chain free radicals, CF 2 (β)C · F(α)CF 2 (β), in poly(tetrafluoroethylene) (PTFE) were analyzed by the change in the hyperfine splitting due to β‐fluorines, which was a decreasing function of the observation temperature. The results were interpreted in terms of the rotational vibration around the C α C β bond. The amplitude of the vibration was estimated on the assumption of its harmonic oscillation. The vibration of the PTFE chain was found to have a large amplitude in comparison with that of a polyethylene chain in single crystals. The vibration of the large amplitude was caused by a weak interchain interaction in the PTFE matrices. The amplitude of the vibration in crosslinked PTFE was much larger than that in noncrosslinked PTFE. This result indicated that the free radicals in crosslinked PTFE were trapped in the amorphous region, which had the disordered sites of crosslinking, whereas the free radicals in noncrosslinked PTFE were mainly trapped in the paracrystalline region. The decay reaction of the free radicals in the PTFE matrices was also related to the heterogeneity in the structure and the rotational vibration. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 1539–1547, 2004" @default.
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- W2049829356 date "2004-03-11" @default.
- W2049829356 modified "2023-10-17" @default.
- W2049829356 title "Rotational vibration of poly(tetrafluoroethylene) chains by the electron spin resonance method" @default.
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- W2049829356 doi "https://doi.org/10.1002/polb.20045" @default.
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