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伽马辐射对电缆模型的影响：通过中红外光谱法研究添加剂效应

Influence of Gamma Irradiation on Electric Cables Models: Study of Additive Effects by Mid-Infrared Spectroscopy.

作者信息

Maléchaux Astrid, Colombani Juliette, Amat Sandrine, Marque Sylvain R A, Dupuy Nathalie

机构信息

Aix Marseille University, Avignon Université, CNRS, IRD, IMBE, 13013 Marseille, France.

IRSN, CEN Cadarache, BP3, 13115 St Paul lez Durance, France.

出版信息

Polymers (Basel). 2021 Apr 30;13(9):1451. doi: 10.3390/polym13091451.

DOI:10.3390/polym13091451
PMID:33946155
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8124882/
Abstract

Cables, especially their insulation and jacket materials made of polymers, are vulnerable to ageing degradation during normal operation. However, they must remain functional for the entire life of a nuclear power plant, or even in the event of an accident for cables with a safety requirement. This study focuses on models of crosslinked polyethylene (XLPE)-based insulation of cables and deals with the structure modification and the behavior of XLPE for nuclear applications due to the effect of additives. Various additives are added to the polymer formulation to evaluate their impact on ageing. The samples are irradiated at room temperature by several gamma doses, up to 374 kGy, with two dose rates (40 Gy/h and 300 Gy/h) and compared with a non-irradiated sample used as reference. To understand the impact of gamma irradiation on the materials, the principal component analysis (PCA) method is applied on spectra recorded through attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The results highlight the effects of ageing depending on the dose rate and on the formulation of the materials, with the identification of different degradation products. A curve resolution study compares the effects of different additives on polymer oxidation and shows that the low dose rate leads to a higher degradation than the high dose rate.

摘要

电缆，尤其是由聚合物制成的绝缘层和护套材料，在正常运行期间容易发生老化降解。然而，它们必须在核电站的整个生命周期内保持功能正常，对于有安全要求的电缆，甚至在发生事故时也需如此。本研究聚焦于基于交联聚乙烯（XLPE）的电缆绝缘模型，并探讨由于添加剂的作用，XLPE在核应用中的结构改性和性能表现。向聚合物配方中添加各种添加剂，以评估它们对老化的影响。样品在室温下以高达374 kGy的几种伽马剂量、两种剂量率（40 Gy/h和300 Gy/h）进行辐照，并与用作参考的未辐照样品进行比较。为了解伽马辐照对材料的影响，主成分分析（PCA）方法应用于通过衰减全反射 - 傅里叶变换红外（ATR - FTIR）光谱记录的光谱。结果突出了老化取决于剂量率和材料配方的影响，并识别出不同的降解产物。曲线分辨率研究比较了不同添加剂对聚合物氧化的影响，结果表明低剂量率比高剂量率导致更高的降解程度。

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Radical Composition and Radical Reaction Kinetics in the Probe-Irradiated XLPE Samples as a Potential Source of Information on Their Aging Degree.作为探测辐照交联聚乙烯（XLPE）样品老化程度潜在信息源的自由基组成和自由基反应动力学
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