ABSTRACT

A novel route of diphenylamine (DPA) formation via ɤ-radiation-induced N-phenylation of aniline by chlorobenzene in oxygen-free condition is reported. A capillary gas chromatography-mass spectrometry method was developed for DPA identification and quantification. The effects of the reactants molar ratio, absorbed radiation dose, and dose rate on the yield of DPA were investigated in ɤ-irradiated aniline/chlorobenzene samples. The yield of DPA was found to be maximum at aniline: chlorobenzene molar ratio of about 1:1. Generally, the yield of DPA increases as absorbed dose increases. The G_(DPA) was determined to be 11.6 μM/J. The DPA yield was found to increase linearly as dose rate increases. This observation can be attributed to the formation of DPA via spur reactions. A reaction mechanism was suggested for the DPA formation in the ɤ-irradiated aniline/chlorobenzene samples.

摘要

报道了在无氧条件下氯苯经ɤ辐射诱导的苯胺N-苯基化形成二苯胺（DPA）的新途径。建立了毛细管气相色谱-质谱联用法对DPA进行鉴定和定量的方法。研究了ɤ辐射苯胺/氯苯样品中反应物摩尔比，吸收辐射剂量和剂量率对DPA收率的影响。发现在苯胺：氯苯摩尔比为约1∶1时，DPA的产率最大。通常，DPA的产量随吸收剂量的增加而增加。G _（DPA）确定为11.6μM/ J。发现DPA产量随剂量率的增加而线性增加。该观察结果可以归因于通过支链反应形成的DPA。建议在γ-射线辐照的苯胺/氯苯样品中形成DPA的反应机理。