烯烃聚合用茂金属催化剂负载化机理的研究进展

Progress in immobilization mechanisms of metallocene catalysts for olefin polymerization

从无机载体、有机高聚物载体和有机无机杂化高聚物载体催化剂三方面综述了近年来烯烃聚合用茂金属催化剂负载化的研究进展。与多活性中心催化剂相比,茂金属催化剂具有活性高,用其所制聚合物的相对分子质量分布窄等特点,茂金属催化剂负载化克服了用均相催化剂制备的聚合物形貌不可控的缺点,并可降低助催化剂用量。目前无机载体是工业生产中最常用的载体类型,但用高聚物载体负载所具有的不需要复杂预处理、茂金属催化剂易被官能化及产物中载体成分不影响最终催化剂性能等优点,也逐渐受到关注。

The research processes in immobilization mechanisms of metallocene catalysts for olefin polymerization were summarized from inorganic-supported catalysts, organic polymer-supported catalysts and organic-inorganic hybrid polymer-supported catalysts. Compared with multi-active-center catalysts, metallocene catalysts had higher activity and the resulted polyolefin had narrower relative molecular mass distribution. Immobilization of metallocene catalysts on solid supports could overcome the drawbacks of homogeneous catalysts in controlling polymer morphology. At present, the most commonly used carrier in industrial production was inorganic carrier, but polymeric carrier drew increasing attention for its simple pretreatment, easy functionalization and the remaining catalyst carrier had little effect on the properties of the catalyst.