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近年来,聚丙烯工业生产的第三代催化剂都使用烷氧基硅烷作外给电子体,不同结构的硅烷作为外给电子体,对丙烯聚合行为的影响研究表明,外给电子体能使聚合物的等规度提高,同时伴随着聚合活性下降,烷氧基硅烷等外给电子体提高等规度的作用,是由于它们选择性地使无规活性中心失活的能力远高于等规活性中心,或使无规活性中心
In recent years, the third-generation catalyst for industrial production of polypropylene uses alkoxysilane as external electron donor. The influence of different structure of silane as external electron donor on the polymerization behavior of propylene shows that external donor can make polymer , And at the same time with the decrease of polymerization activity and the increase of isotacticity of external electron donors such as alkoxysilanes because of their ability to selectively inactivate a randomly active center is much higher than that of isotactic activity Center, or to make a center of activity