Synthesis of Alkylaluminoxane and Catalytic Effect of Alkylaluminoxane in Single-site Catalysts
Alkylaluminoxanes are widely used as co-catalysts in single-site catalysts,including metallocene catalysts as well as non-metallocene catalysts such as FI catalysts and post-transition metal catalysts,which have significantly improved the catalytic activity and facilitated the rapid development of polyolefin industry.In particular,the combination of methylaluminoxane(MAO)and metallocene catalysts makes it possible to produce high-performance polyolefin materials with precisely adjustable microstructures,for instance,metallocene polyethylene(mPE),metallocene polypropylene(mPP),metallocene ethylene-propylene rubber(mEPDM),polyolefin elastomer(POE).Alkylaluminoxanes are costly and the interaction with the active centre can have a great impact on the catalytic performance.An overview of the synthetic methods,structural analysis methods and mechanisms by which alkylaluminoxanes exert a co-catalytic effect is given.
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