Lungulescu Eduard-Marius, Setnescu Radu, Ilie Sorin, Taborelli Mauro
National Institute for Research and Development in Electrical Engineering ICPE-CA, 313, Splaiul Unirii, 030138 Bucharest, Romania.
Department of Advanced Technologies, Faculty of Sciences and Arts, Valahia University of Târgoviște, 13 Aleea Sinaia, 130004 Targoviste, Romania.
Polymers (Basel). 2022 Jun 10;14(12):2357. doi: 10.3390/polym14122357.
The durability of polymeric materials is closely linked to their degradation under specific operating conditions when different stressors-general or specific, such as high temperature, sunlight or ionizing radiation, solvents, or mechanical stresses-act simultaneously, causing degradation. In the case of electrical cables, the durability of the electrically insulating materials used in their construction is an important parameter to ensure their operational security. In this work, we studied the degradation state of various types of electrical insulating materials from cables used in particle acceleration systems under European Organization for Nuclear Research (CERN) conditions (e.g., Super Proton Synchrotron, SPS) as a function of time and irradiation dose. A simple kinetic model was proposed based on the exponential decrease in the antioxidant amount in polymeric insulations. The onset oxidation time (OIT) values, used as an indicator of antioxidant concentration, were obtained from isothermal differential scanning calorimetry (DSC) and chemiluminescence (CL) measurements. Fourier transform infrared (FTIR) measurements were used to assess the degradation state and identify polymeric materials. The practical applicability of such a model in diagnosing degradation and in the subsequent evaluation of the remaining service life is of interest, as it can be adapted to a broad range of operating conditions and materials.
聚合物材料的耐久性与其在特定运行条件下的降解密切相关，此时不同的应力源——一般的或特定的，如高温、阳光或电离辐射、溶剂或机械应力——同时作用，导致材料降解。对于电缆而言，用于其制造的电绝缘材料的耐久性是确保其运行安全的一个重要参数。在这项工作中，我们研究了欧洲核子研究组织（CERN）条件（如超级质子同步加速器，SPS）下粒子加速系统中使用的电缆的各种类型电绝缘材料的降解状态，作为时间和辐照剂量的函数。基于聚合物绝缘中抗氧化剂含量的指数下降提出了一个简单的动力学模型。用作抗氧化剂浓度指标的起始氧化时间（OIT）值是通过等温差示扫描量热法（DSC）和化学发光（CL）测量获得的。傅里叶变换红外（FTIR）测量用于评估降解状态并识别聚合物材料。这种模型在诊断降解以及随后评估剩余使用寿命方面的实际适用性备受关注，因为它可以适用于广泛的运行条件和材料。
