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EPR study of carbon in the products of the electrochemical reduction of poly(tetrafluoroethylene)

✍ Scribed by L. Kavan; J. Klíma; M. Pšeidlová

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
618 KB
Volume
23
Category
Article
ISSN
0008-6223

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✦ Synopsis

The EPR spectra of elemental carbon in the products of the electrochemical reduction of poly(tetrafluoroethylene) by lithium amalgam were studied. The primary product of the reduction, C(LiF)2Li0,,, contains 2.1. 1020 spinsimol. The concentration of the spin centers in partially reacted poly(tetrafluoroethylene) is in agreement with the stoichiometry of the corrosion process in a wide range of degrees of conversion. The spin centers are reactive to atomospheric oxygen, but only in a thin surface layer of the sample. Deeper layers of the compact material are stable to atmosphe~c oxidation. By washing out the LiF with water under completely oxygen-free conditions, elemental carbon can be prepared with no apparent decrease in the concentration of spin centres, but the EPR signal becomes completely sensitive to atmospheric oxidation. The structural bonding aspects of the observed facts are discussed.

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