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• W2030858462 abstract "Radiolysis at 77 K of bulk polymerized polymethylmethacrylate containing naphthalene results in the formation of cations of the additive and anions of the residual monomer as shown by absorption and ESR spectra. The concentration of cations first increases with naphthalene concentration and then reaches a limit. In the concentrated samples, the dimer-cation of naphthalene forms on heating the sample above 170 K. The cations of naphthalene and anions of monomer decay on increasing temperature above 77 K. The thermoluminescence observed between 80 and 260 K is attributed to the recombination of close ion-pairs. It is shown to consist of fluorescence and phosphorescence of naphthalene. Excimer fluorescence is emitted by the more concentrated samples. Their relative intensities depend on temperature. Luminescence is also produced when samples previously submitted to γ-rays are irradiated with i.r. or visible light at 77 K. Infra-red or visible light also induces disappearance of the cations of naphthalene and anions of monomer as indicated by changes in the absorption and ESR spectra. La radiolyse à 77 K du polyméthacrylate de méthyle polymérisé en masse et contenant du naphtalène conduit à la formation de cations de l'additif et d'anions du monomère résiduel, ainsi que le démontrent les spectres d'absorption et de résonance électronique paramagnétique. La concentration en cations augmente d'abord avec la concentration en naphtalène et atteint ensuite une limite. Dans les échantillons les plus concentrés, le cation-dimère du naphtalène se forme lorsque l'echantillon est chauffé au-delà de 170 K. Les cations du naphtalène et les anions du monomère disparaissent lorsque l'échantillon est chauffé au-delà de 77 K. La thermoluminescence observée entre 80 et 260 K est attribuée à la recombinaison de paires cation-anion proches. L'analyse de la thermoluminescence a montré qu'elle est constituée de fluorescence et de phosphorescence du naphtalène. De la fluorescence d'excimère est émise par les échantillons les plus concentrés. Les intensités relatives de ces émissions dépendent de la température. Une luminescence est également émise lorsque des échantillons préalablement soumis au rayonnement-γ sont irradiés avec la lumière visible ou i.r. Cette lumière visible ou i.r. induit également la disparition des cations du naphtalène et des anions du monomère ainsi que le montrent les modifications du spectre d'absorption et du spectre R.E.P." @default.
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• W2030858462 date "1978-01-01" @default.
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• W2030858462 title "Formation and decay of radical ions of naphthalene and emission of thermoluminescence in irradiated polymethylmethacrylate" @default.
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• W2030858462 doi "https://doi.org/10.1016/0146-5724(78)90046-8" @default.
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