通过环己基氯与对位取代酚烷基化方法在酚的氧邻位引入高位阻的环己基,再经甲酰化、胺缩合及配合制得两种新的中性镍配合物[O-(3-C6H11)(5-CH3)C6H2-o-C(H)∶N-2,6-(I-Pr)2C6H3]Ni(Ph3P)(Ph)和[O-(3-C6H11)(5-Cl)C6H2-o-C(H)∶N-2,6-(I-Pr)2C6H3]Ni(Ph3P)(Ph). 在Ni(COD)2(COD环辛二烯)存在下,两种配合物均可有效地催化乙烯聚合反应,且后者的催化性能明显优于前者的催化性能. 两种配合物对温度很敏感,适宜的聚合温度是45～55 ℃. 随着乙烯压力的提高,催化剂的活性显著提高,聚合物的粘均分子量(Mη)显著增大,带支链的聚乙烯减少. 在n(Ni(COD)2)/n(cat)=3,V(PhCH3)=30 ml,p(C2H4)=1.2 Mpa,θ=45 ℃和t=20 min的条件下,前者配合物的活性为3.62×105 g/(mol·h),聚乙烯的Mη=4.94×104; 后者配合物的活性为7.29×105 g/(mol·h),聚乙烯的Mη=7.16×104. 两种配合物添加极性物质后的活性顺序为: 乙醚》四氢呋喃》乙酸乙酯》水》乙醇. 其中,乙醚和四氢呋喃可使催化剂活性提高.
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