Satellites in space environment are subject to several environmental constraints. In the case of polymer materials, electronic irradiations can induce premature ageing which can lead to a shorter lifetime for the satellite. Moreover, synergistic effects between temperature and irradiation can occur and enhance this ageing. A previous study showed that PolyEtherEtherKetone (PEEK), a newly used polymer in space industry, presents great radiation tolerance properties. Nonetheless, it was necessary to investigate the influence of temperature factor on its ageing. This study focuses on the comparison of PEEK samples aged at two temperatures: room temperature and 165^∘C. Irradiations have been performed under high-vacuum and with a mono-energetic electron beam. They led to doses representative of 15 years of exposure to geostationary electronic environment. The comparison between both types of samples showed that increase in irradiation temperature have a significant impact on ageing kinetics. In particular, analyses revealed a higher cross-linking density for 165^∘C irradiated samples which has been associated with a higher recombination rate of radicals due to amorphous phase mobility increase above glass transition.

太空环境中的卫星受到多种环境限制。在聚合物材料的情况下，电子辐射会引起过早老化，从而导致卫星寿命缩短。此外，温度和辐照之间会产生协同效应，并增强老化效果。先前的研究表明，航天工业中新使用的聚合物PolyEtherEtherKetone（PEEK）具有出色的辐射耐受性。但是，有必要研究温度因子对其老化的影响。这项研究的重点是比较在两种温度下老化的PEEK样品：室温和165 ^comparisonC.已经在高真空和单能电子束下进行了辐照。他们导致了代表对地静止电子环境15年的剂量。两种样品之间的比较表明，辐照温度的升高对老化动力学有重大影响。尤其是，分析显示，对于^165∘C辐照的样品，其交联密度较高，这是由于非晶态迁移率高于玻璃化转变温度，导致自由基的重组率更高。