Thermal Destruction and Calorimetry of Ultradisperse Polytetrafluoroethylene
V. M. BOUZNIK1, I. N. MIKHALIN1, P. P. SEMYANNIKOV2, T. S. KUKHLEVSKAYA3, A. K. TSVETNIKOV3, and A. V. KARTASHOV4
1Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 5, Novosibirsk 630090 (Russia) E-mail: bouznik@catalysis.nsk.su
2Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia)
3Institute of Chemistry, Far East Branch of the Russian Academy of Sciences,
Pr. 100-letiya Vladivostoka 159, Vladivostok 690022 (Russia)
4Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50, Krasnoyarsk 660036 (Russia)
Pages: 589-594
Abstract
Ultradisperse tetrafluoroethylene powder obtained by thermo-gas-dynamic method (FORUM TM material) was studied by derivatography, mass spectrometry, and differential scanning microcalorimetry. Thermal decomposition of FORUM and its thermophysical properties differ significantly from those of commercial PTFE. The temperature range of decomposition increased more than fourfold: 465-595oC for PTFE, and 70-550oC for FORUM. Thermal decomposition of FORUM gave a wide spectrum of molecular fragments with atomic weights from 31 up to 881. In the crystalline phase, there are no phase transitions characteristic of commercial PTFE samples; at the same time, the melting and transformation points in the amorphous part of the polymer are shifted.
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