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Temperature and LET effects on radiation-induced modifications in non-perfect polyethylenes
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2019-02-13 , DOI: 10.1016/j.polymdegradstab.2019.02.002
K. Furtak-Wrona , M. Cornaton , D. Durand , V. Dauvois , J.-L. Roujou , S. Esnouf , M. Ferry

Regarding the nuclear safety, the potential accumulation of explosive gases during storage, transport and final disposal of Intermediate Level Long Lived Wastes (IL-LLW) has to be well understood and precisely evaluated. In this paper, we have investigated the Linear Energy Transfer (LET) effect that takes into account the different emitters present in the packages, but also the temperature impact in transport safety cases. We have focused our study on polyethylene, as this polymer presents one of the highest hydrogen radiation chemical yield (G0(H2)), and because of the explosive and inflammable nature of this gas. Chemical defects included in the polymer in the form of carbonyl (C=O) and vinyl (C=C) groups were explored. Depending on the atmosphere of irradiation, they are the main defects formed in polyethylene under irradiation and they are known to be effective energy and radical scavengers. Characterization of the chemical structure of pristine materials has been done. Hydrogen radiation chemical yields were quantified after polymers irradiation. Additionally, the carbon monoxide release was measured for polyethylenes with C=O moieties. Whatever the type of double bonds present in the polymer and whatever the irradiation conditions, hydrogen emission decreases compared to neat materials. Double bonds are effective scavenging groups to which energy is transferred regardless the irradiation nature. Underlying phenomena are explained in this work.



中文翻译:

温度和LET对非完美聚乙烯中辐射诱导的改性的影响

关于核安全,必须充分理解和精确评估在储存,运输和最终处置中级长寿命废物(IL-LLW)期间爆炸性气体的潜在积累。在本文中,我们研究了线性能量转移(LET)效应,该效应考虑了包装中存在的不同发射器,还考虑了运输安全情况下的温度影响。我们已将研究重点放在聚乙烯上,因为这种聚合物具有最高的氢辐射化学收率(G 0(H 2)),并且由于这种气体具有爆炸性和易燃性。探索了以羰基(C = O)和乙烯基(C = C)形式包含在聚合物中的化学缺陷。根据辐照的气氛,它们是聚乙烯在辐照下形成的主要缺陷,已知它们是有效的能量和自由基清除剂。原始材料化学结构的表征已经完成。聚合物辐照后,对氢辐照化学产率进行定量。另外,测量具有C = O部分的聚乙烯的一氧化碳释放。无论存在于聚合物中的双键类型如何,无论辐照条件如何,与纯净材料相比,氢的排放量都会减少。双键是能量的有效清除基团,无论辐射的性质如何,能量都会转移至该基团。在这项工作中解释了潜在的现象。

更新日期:2019-02-13
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