中文摘要：

选用芴环上带有不同取代基配合物1{[t-Bu NHSi Me2Flu]Ti Me2}、2{t-Bu NSi Me2（2,7-di-t-Bu Flu）Ti Me2}、3{[Me2Si（C29H37）（NtBu）]Ti Me2}的Cs-对称芴基氨基二甲基钛络合物,在修饰甲基铝氧烷活化下,进行乙烯常压聚合,研究了取代基对聚合活性和聚乙烯数均相对分子质量的影响。结果表明：随着t-Bu基团的引入,催化剂的聚合活性显著提高,同时聚合物数均相对分子质量明显增加。相当于芴环的2、3、6、7位引入t-Bu基的配合物3的乙烯聚合活性达到2085 kg-PE/（mol-Ti·h）,得到数均相对分子质量为81万的聚乙烯。

英文摘要：

Fluorenyllamidodimethyltitanium complexes 1{[t-Bu NHSi Me2Flu]Ti Me2}, 2 {t-Bu NSi Me2（2,7-di-t-Bu Flu）Ti Me2} and 3 {[Me2Si（C29H37）（NtBu）]Ti Me2} were applied for ethylene polymerization using modifiedmethyaluminoxane（MMAO/BHT） as a cocatalyst under atmospheric pressure of ethylene respectively. Theintroduction of t-Bu substituents to the fluorenyl ligand improved the polymerization activity and producedhigher molecular weight polyethylene. Complex 3 which contains t-Bu substituents on the 2, 3, 6, 7 positionof fluorenyl ligand showed the highest activity of 2 085 kg-PE/（mol-Ti·h）and number average molecularweight of 810 000.