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选用芴基胺基二甲基钛配合物1b{[t-BuNSiMe_2(2,7-t-Bu_2Flu)]TiMe_2}和2{[(1-Adamantyl)NSiMe_2(2,7-t-Bu_2Flu)]TiMe_2},在改性甲基铝氧烷(MMAO)和2,6-二叔丁基-4-甲基苯酚(BHT)的活化下,催化乙烯的均聚反应。结果表明:胺基上的取代基金刚烷相比于叔丁基,可以提高聚合活性并有利于高相对分子质量聚乙烯的合成;延长反应时间可提高聚合物的产量及相对分子质量,但过长的反应时间会使聚合体系出现团聚现象,降低聚合活性。
Fluoreneamidomethyltitanium complexes 1b {[t-BuNSiMe_2 (2,7-t-Bu_2Flu)] TiMe_2} and 2 {[1-Adamantyl) NSiMe_2 }, Catalyzes the homopolymerization of ethylene with the activation of modified methylaluminoxane (MMAO) and 2,6-di-tert-butyl-4-methylphenol (BHT) The results showed that the substitution of adamantane on the amino group could improve the polymerization activity and favor the synthesis of high molecular weight polyethylene. Extending the reaction time could improve the yield and relative molecular mass of the polymer. However, Long reaction time will agglomeration polymerization system, reducing polymerization activity.