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Polymers degradation under radiolysis : experimental adaptations of devices for irradiating samples dedicated to analytical methods perspectives.

Abstract : The degradation of polymers under irradiation leads, to gas emission, and, to chemical modifications of the polymer backbone. The determination of reliable radiation chemical yields of these modifications requires the management of many different parameters, such as irradiation nature, dose, dose rate, temperature, surrounding atmosphereFor determining those chemical yields the use of analytical devices creates other constraints to deal with, such as detection limits, or samples transfers to the detector. In the LRMO laboratory, studies are realized in the context of the nuclear safety, to evaluate risks of degradation under radiolysis of the organic materials in the nuclear wastes during conditioning, transport, storage and final disposal in French deep underground repository. In these conditions, different emitters are encountered, as well as very high doses. Depending on the researched parameter, the realization of specific irradiation devices can be required with controlled atmospheres. Some devices can be batches closed vessels, or dynamic vessels for solutions, within the objective to determine radiation chemical yields under non usual conditions (very high doses up to several MGy, high temperature, under acidic atmosphere).The various glass vessels solutions, as well as the specific environment inside the vessels, for analytical methods, and for dose deposition will be presented.Moreover, many analytical tools are available, as a function of the modification that has to be evaluated. High resolution gas mass spectrometry, allowing differentiation between CO and N2 can be used for gases radiation chemical yields determination. In the case of the polymer backbone modification or for organic molecules release studies, mass spectrometers with different sources or coupled analytical techniques such as GC-MS or LC-MS can be employed. The direct measurements on irradiated polymers using FTIR methods and ATG-DSC.This poster will present some experimental devices developed in the laboratory and the connection to analytical tools.
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Submitted on : Thursday, January 16, 2020 - 11:30:27 AM
Last modification on : Tuesday, April 28, 2020 - 11:28:16 AM
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  • HAL Id : hal-02441965, version 1

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J. Roujou, M. Ferry, D. Durand, V. Dauvois, S. Esnouf, et al.. Polymers degradation under radiolysis : experimental adaptations of devices for irradiating samples dedicated to analytical methods perspectives.. IRAP 2016 - The 12th meeting of the “Ionizing radiation and polymers” symposium, Sep 2016, Giens, France. ⟨hal-02441965⟩

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