Effect of Gamma Radiation on the Surface and Bulk Properties of Poly(tetrafluoroethylene)статья

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Дата последнего поиска статьи во внешних источниках: 15 февраля 2018 г.

Работа с статьей

[1] Effect of gamma radiation on the surface and bulk properties of poly(tetrafluoroethylene) / A. Y. Obvintsev, N. V. Sadovskaya, S. A. Khatipov, V. M. Buznik // Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques. — 2017. — Vol. 11, no. 5. — P. 948–954. The effect of gamma radiation on the contact angle theta, the work of adhesion gamma(SL) for polar and nonpolar liquids, disperse and polar components of the surface energy gamma(S), the magnitude of bulk dielectric polarization P-0, and the dielectric increment Delta epsilon for sintered and non-sintered poly(tetrafluoroethylene) (PTFE) of suspension polymerization are studied. Sintered PTFE exhibits anomalously high growth of the studied parameters with an absorbed dose up to 500 kGy: Delta epsilon by more than four orders of magnitude, the work of adhesion of the polar liquid gamma(H2O)(SL) by a factor of 1.5, the polar component of the surface energy gamma(pol)(S) by 20 times. The observed changes are found to be considerably larger than those expected from the viewpoint of the amplification of dipole-dipole and donor-acceptor molecular interactions with the participation of polar groups formed in poly(tetrafluoroethylene) upon irradiation. The similar behavior of Delta epsilon, gamma(H2O)(SL), and gamma(pol)(S) parameters depending on the exposed dose and subsequent annealing of the samples at 150 degrees C is revealed. A unified mechanism for changes in the bulk polarization and surface properties caused by the formation in poly(tetrafluoroethylene) of long-lived electron-hole pairs is suggested. [ DOI ]

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