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- W2059732322 abstract "It has been demonstrated that in IR spectra of vacuum- deposited poly-para-phenylene (PPP) film an extremely strong band at 1375 cm-1 is observed, which is not typical of currently known PPP modifications. High intensity of the band at 1375 cm-1 was associated with the change in the bond order of the 'defect' C-C bond between adjacent quinoid and benzenoid units. Mechanism of quinoid fragments formation in process of PPP film grows is here suggested. The p- phenylene radicals generated during thermal destruction of PPP powder are extremely active. However, when they appear included in the solid phase, they lose much of their initial reactivity, and recombination may be kinetically hindered. In this case, the macromolecules with 'stuck' terminal phenyl radicals could form. The vacuum-deposited poly-para-phenylene solid phase exhibits high crystallinity. Therefore, the recombination of 'stuck' radicals can be essentially hampered. In this case the isomerization of 'stuck' radicals gives delocalized defects. The possibility of practical applications of vacuum-deposited PPP films with delocalized defects is discussed.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W2059732322 date "2001-06-15" @default.
- W2059732322 modified "2023-09-23" @default.
- W2059732322 title "High-intensity vibrations in poly-para-phenylene chain: experiment and model" @default.
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- W2059732322 doi "https://doi.org/10.1117/12.429380" @default.
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