Abstract Radiolytic stability of pillar[5]arene-based diglycolamides (P5DGAs) against gamma irradiation up to 1000 kGy adsorbed dose was studied. The results reveal the increase of radiation damage degree on P5DGAs with dose. The radiolysis products of P5DGAs including the gaseous and solid products were fully characterized by 1H NMR, HR-ESI-MS, GC, and HPLC techniques. It was found that the main radiolytic gas products of P5DGAs under argon are H2, N2, CO and gaseous hydrocarbons. The solid degradation products contain phenolic hydroxyl groups and secondary amine groups. In addition, solvent extraction toward Eu(III) was performed with P5DGAs, in which about 50% decrease on extraction efficiency was observed for irradiated P5DGAs with dose of 1000 kGy in comparison with the non-irradiated one. A radiolytic degradation pathway was also proposed based on the above results. This is the first time to investigate the radiolytic stability of neat P5DGAs and P5DGAs in molecular diluent in detail and provides useful information for further application of P5DGAs in practical applications for spent fuel reprocessing.

中文翻译：

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柱[5]芳烃基二甘醇酰胺的辐射稳定性

摘要 研究了柱 [5] 芳烃基二甘醇酰胺 (P5DGAs) 对高达 1000 kGy 吸附剂量的伽马辐射的辐射稳定性。结果表明，随着剂量的增加，P5DGAs的辐射损伤程度增加。P5DGAs 的辐射分解产物包括气态和固态产物，通过 1H NMR、HR-ESI-MS、GC 和 HPLC 技术进行了充分表征。发现氩气下P5DGAs的主要辐射分解气体产物是H2、N2、CO和气态烃。固体降解产物含有酚羟基和仲胺基团。此外，使用 P5DGA 对 Eu(III) 进行溶剂萃取，其中与未辐照的 P5DGA 相比，辐照剂量为 1000 kGy 的 P5DGA 的提取效率降低了约 50%。基于上述结果还提出了辐射降解途径。这是首次详细研究纯 P5DGAs 和 P5DGAs 在分子稀释剂中的辐射稳定性，为 P5DGAs 在乏燃料后处理实际应用中的进一步应用提供有用信息。