1971 Volume 44 Issue 3 Pages 595-599
Particles of polyvinyl chloride were coated with small amounts of various aromatic compounds from benzene solutions and were then irradiated in a vaccum. The ESR spectra of the specimen thus obtained were recorded. Though the amount of the coated additives, in the ratio of 1 molecule for 100 monomer units of PVC, was small, strong effects on the ESR spectra were observed. The additives coated on the surface affect the ESR spectra in two ways. They cause a decrease in the total ESR absorption intensity; this was observed with all the additives studied. They also often transform the ESR spectrum; this was observed with several additive compounds, such as p-benzoquinone, tetramethylphenylenediamine-2·HCl, chrysene, hydroquinone, nitrosonaphthol, perylene, and diphenylpicrylhydrazine. Only the conduction of the excitations, holes and electrons formed in the bulk particles, to the surface of the particle can explain these results. On the surface of the particle, the excitation or the electric charge is transferred to the additive by means of an intermolecular interaction with it. The possibilities for the mechanism of the conduction of the excitation and the electric charges, and the ionization processes are discussed.
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