Abstract: A new tert-butyl-substituted dendrimer compound and its corresponding Ni(Ⅱ) complex were synthesized and characterized with 1H NMR，elemental analysis，FT-IR，UV. The nickel complex activated by methylaluminoxane (MAO) was tested in oligomerization of ethylene. The effects of Al/Ni molar ratio and polymerization temperature on catalyst activity and product distribution were also investigated. The products were olefines with different carbon chains，catalytic activity reached a maximum value 4.93×105g/(mol Ni?h) at reaction time of 30min，reaction pressure of 0.5MPa，reaction temperature of 25℃ and Al/Ni ratio 500 for the tert-butyl-substituted nickel complex，and C10—C18 were 54.17%.

Key words: dendrimer, salicylaldehyde-imine ligand, nickel complex, ethylene oligomerization

摘要： 合成了一种含有强供电子、较大空间位阻的新型树枝状水杨醛亚胺配体及其镍配合物，利用1H NMR、元素分析、FT-IR、UV进行了表征。以配合物为催化剂，甲基铝氧烷（MAO）为助催化剂对乙烯齐聚反应进行了研究，详细考察了聚合反应温度、Al/Ni摩尔比、反应压力及时间对催化剂活性及产物分布的影响。结果表明，齐聚产物为不同碳链的烯烃，在温度为25℃、Al/Ni=500、压力为0.5MPa、时间为0.5h的条件下，树枝状催化剂的活性最高，达到4.93?105g/(mol Ni?h)，C10～C18的含量为54.17%。

关键词: 树枝状大分子, 水杨醛亚胺配体, 镍配合物, 乙烯齐聚