Spectroscopic Investigation of Sublimated Products of Ultradisperse Polytetrafluoroethylene |
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| Authors: | L N Ignatieva A K Tsvetnikov O N Gorbenko T A Kaidalova V M Buznik |
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| Institution: | (1) Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia;(2) G. K. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia |
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| Abstract: | The structure of fractions isolated by thermal sublimation of ultradisperse polytetrafluoroethylene (UPTFE) powder has been studied by IR spectroscopy. At 50°C–160°C, fractions of highly amorphous fragments are condensed on a cold receiver; the fragments are constructed from branched chains with terminal olefin groups. Fractions isolated at 300°C and higher are close in structure to PTFE and are highly crystalline. It is assumed that sample amorphism is due to the irregular distribution of the fractions of fragments with terminal olefin and lateral fluoromethyl groups in the structures.Original Russian Text Copyright © 2004 by L. N. Ignatieva, A. K. Tsvetnikov, O. N. Gorbenko, T. A. Kaidalova, and V. M. Buznik__________Translated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 5, pp. 830–836, September–October, 2004. |
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| Keywords: | polytetrafluoroethylene modified forms sublimation products molecular structure crystallinity amorphism IR spectra |
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