Degradation pathways of Irganox 1010 in aged plastic bonded explosive (PBX) 9501 were investigated using ultrahigh performance liquid chromatography coupled to quadrupole time of flight mass spectrometry (UHPLC-QTOF). Using a targeted approach, a total of 44 Irganox 1010 decomposition products were discovered. These decomposition products were formed through hydrolysis, scission, and/or oxidation of Irganox 1010. The hydrolytic decomposition of Irganox is a straightforward process resulting in the cleavage of the ester group(s) while oxidation and scission are more complicated and can happen at multiple locations on the Irganox 1010 molecule. Moreover, due to the symmetric nature of Irganox 1010, multiple decomposition reactions can occur. Indeed some decomposition products exhibited hydrolysis, oxidation, and scission. In order to probe any trends in the aged PBX 9501 samples, principal component analysis (PCA) was implemented. The greatest chemical differences between the aged PBX samples was hydrolysis of the ester functional groups on Irganox 1010. Despite the negative connotations of hydrolysis, the Irganox 1010 decomposition products are still able to function as a radical scavenger in PBX 9501 as intended.

中文翻译：

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Irganox 1010 在塑封炸药中的分解

使用超高效液相色谱与四极杆飞行时间质谱联用 (UHPLC-QTOF) 研究了 Irganox 1010 在老化的塑结炸药 (PBX) 9501 中的降解途径。使用有针对性的方法，共发现了 44 种 Irganox 1010 分解产物。这些分解产物是通过 Irganox 1010 的水解、断裂和/或氧化形成的。Irganox 的水解分解是一个直接的过程，会导致酯基的裂解，而氧化和断裂则更复杂，并且可能发生在多个Irganox 1010 分子上的位置。此外，由于 Irganox 1010 的对称性，可能会发生多种分解反应。事实上，一些分解产物表现出水解、氧化和断裂。为了探测老化的 PBX 9501 样本中的任何趋势，实施了主成分分析 (PCA)。老化的 PBX 样品之间最大的化学差异是 Irganox 1010 上酯官能团的水解。尽管水解具有负面含义，但 Irganox 1010 分解产物仍然能够按预期在 PBX 9501 中充当自由基清除剂。