Abstract The effects of four Schiff base bridged phenolic diphenylamine antioxidants (SSPDs) on the multifunctional properties of a traditional additive zinc dialkyldithiophosphate (ZDDP) were studied. Interestingly, it is observed that the cooperation between SSPDs and ZDDP improves the antioxidant, antiwear and extreme pressure of lubricant oil, but does not reduce its anticorrosive property. The EDS and XPS results indicated that a unique interaction was occurred between SSPDs and ZDDP. In addition, the synergistic effect was studied by NMR, which showed that SSPD selectively disintegrated the cage structures (basic form) of the ZDDP to afford a donor-acceptor complex via the coordination of nitrogen of imine to the zinc atom.

中文翻译：

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二烷基二硫代磷酸锌与席夫碱桥连酚二苯胺抗氧化剂之间的独特协同作用

摘要 研究了四种席夫碱桥连酚二苯胺抗氧化剂 (SSPDs) 对传统添加剂二烷基二硫代磷酸锌 (ZDDP) 多功能性能的影响。有趣的是，观察到SSPDs和ZDDP之间的配合提高了润滑油的抗氧化、抗磨和极压性能，但并没有降低其防腐性能。EDS 和 XPS 结果表明 SSPD 和 ZDDP 之间发生了独特的相互作用。此外，通过NMR研究了协同效应，这表明SSPD通过亚胺的氮与锌原子的配位选择性地分解ZDDP的笼状结构（基本形式）以提供供体-受体复合物。