烷基铝氧烷的合成以及在单中心催化剂中的作用

Synthesis of Alkylaluminoxane and Catalytic Effect of Alkylaluminoxane in Single-site Catalysts

烷基铝氧烷作为助催化剂广泛用于茂金属催化剂和非茂金属催化剂(如FI催化剂、后过渡金属催化剂)等单活性中心催化体系,显著提高了催化活性,促进了聚烯烃工业的迅速发展。特别地,甲基铝氧烷与茂金属催化剂的组合,使得诸多微观结构精确可调的高性能聚烯烃材料(如茂金属聚乙烯、茂金属聚丙烯、茂金属乙丙橡胶、茂金属弹性体等)的生产成为可能。烷基铝氧烷成本高昂,与活性中心的相互作用对催化性能有很大的影响。本文对烷基铝氧烷的合成方法、结构分析手段和发挥助催化作用的机理等情况进行了综述。

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.