AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA PHYSICA - Ediţia nr.1 din 2004 | |||||||
Articol: |
SOME CONSIDERATIONS CONCERNING THE RELAXATION OF THE RADIATION FREE RADICALS IN POLYMERS. Autori: M. VELTER-STEFANESCU, O.G. DULIU, N. PREDA, I. URSU. |
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Rezumat: Relaxation measurements performed below 77 K in X and Q bands on electrons irradiated polymers (polyethylene, polycarbonate and polymethylmethacrylate) show that the spin-lattice relaxation time of radiation free radicals varies inverse proportionally with the square of absolute temperature and free radicals concentration but does not depend on the magnetic field. All these characteristics has been explained by taking into account that below 77 K there is a considerable amount of stable radical-pairs that mediate the relaxation process of single radicals. Accordingly, within this hypothesis, an analytical equation that quantitatively describes all these particularities has been deduced. | |||||||