中文摘要：

以溴代十二烷和乙二胺为原料,通过亲核取代反应制备了N,N-双十二烷基乙二胺（C26H56N2）,通过实验考察了合成条件变化对N,N-双十二烷基乙二胺合成的影响。结果表明：在n（溴代十二烷）∶n（乙二胺）=2.4∶1、回流温度下反应8 h得到目标产物,收率为45.5%;利用FTIR、1H NMR、元素分析等手段对其结构进行了表征。探索了N,N-双十二烷基乙二胺作为润滑油添加剂的新应用。采用四球摩擦磨损试验考察了其在聚乙二醇400中的摩擦学性能。结果显示,当N,N-双十二烷基乙二胺添加量为2%时,聚乙二醇400的PB值可由696 N提高至862 N。

英文摘要：

N,N-didodecylethylenediamine was prepared via nucleophilic substitution by using ethylenediamine and 1-bromododecane.The effect of reaction conditions on the synthesis of N,N-didodecylethylenediamine was investigated experimentally.The results show that the yield of N,N-didodecylethylenediamine is 45.5% under the following reaction conditions ： the molar ratio of 1-bromododecane to ethylenediamine was 2.4 ∶ 1,and the reaction was effected for 8 h at reflux temperature.The chemical structures of the prepared compounds were characterized by FTIR,1H-NMR spectra and elemental anal.New application of N,N-didodecylethylenediamine as additives in lubricants was explored.The tribological properties of the N,N-didodecylethylenediamine as additives in PEG 400 were evaluated using a four-ball tester.The results show that the PB value of PEG 400 could be increased from 696 N to 862 N when the adding weight percent of N,N-didodecylethylenediamine is 2%.