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Comportement des verres cyclohexane/benzène et des copolymères éthylène/styrène sous rayonnements ionisants : transferts d'énergie et d'espèces entre les groupements aliphatiques et aromatiques

Abstract : The aim of this study is to understand how aliphatic and aromatic groups interact under ionizing radiations. Three research orientations were explored: the determination of the relative contribution of energy and radical transfers, the determination of the intermolecular and intra-chain relative contribution, and the influence of the repartition of the aliphatic and aromatic units inside the polymer chain. Three systems composed of aromatic and aliphatic units were studied: the cyclohexane/benzene organic glasses (intermolecular reactions), the ethylene/styrene random copolymers (inter-chain and intra-chain reactions) and ethylene/styrene diblocs copolymers (influence of the repartition of the aliphatic and aromatic units in the material).
Considering the results obtained, we have concluded that energy transfers are important in the radiation protection effect of the aliphatic moiety by the aromatic one, although radical transfers are also contributing. Intermolecular transfers are efficient in the solid state and their efficiency seems equivalent to that of the intra-chain ones. Thanks to the use of infrared spectroscopy, we have shown an important effect of radiation sensitization of the aromatic moiety, whatever the irradiation temperature and the system studied: energy transfers to the aromatic moiety are carried out at the detriment of its stability. Finally, the repartition of the aliphatic and aromatic units in the polymer chain is not an important factor in the effects induced by the energy transfers.
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Submitted on : Thursday, January 8, 2009 - 6:07:48 PM
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  • HAL Id : tel-00351263, version 1

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Muriel Ferry. Comportement des verres cyclohexane/benzène et des copolymères éthylène/styrène sous rayonnements ionisants : transferts d'énergie et d'espèces entre les groupements aliphatiques et aromatiques. Physique [physics]. Université de Caen, 2008. Français. ⟨tel-00351263⟩

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