Pyrolysis and chromatomass spectrometry of high-molecular-weight and low-molecular-weight polytetrafluoroethylenes

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Abstract

The article provides information on the methods for studying the mechanisms of depolymerization and thermal destruction of polytetrafluoroethylene (PTFE) and its low-molecular-weight fractions. It is shown that pyrolysis gas chromatograph mass spectrometry (Pi-GC/MS) is the most widely used method for analyzing the consist and properties of high-molecular-weight and low-molecular-weight polytetrafluoroethylenes, but this method does not allow good separation of the peaks of saturated and unsaturated fluorocarbons and identification is possible only by characteristic ions. It is possible to use the Pi-GC/MS option, where the mass spectrometer operates in the negative chemical ionization mode with methane and isobutane reagent gases. The separation does not become better, but good mass spectra are recorded, where molecular ions are present. Only multidimensional gas chromatography allows complete separation of the peaks of saturated and unsaturated fluorocarbons.

About the authors

V. S. Shatilov

Institute of Chemistry, FEB RAS

Email: shatilov.val@mail.ru
Vladivostok, Russia

P. A. Zadorozhny

Institute of Chemistry, FEB RAS

Email: zadorozhny@mail.ru
Vladivostok, Russia

S. V. Sukhoverkhov

Institute of Chemistry, FEB RAS

Email: svs28@ich.dvo.ru
Vladivostok, Russia

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