丙烯聚合Z-N催化剂中的给电子体及其作用机理

给电子体在Ziegler-Natta催化剂中对提高聚丙烯的立构规整性具有非常重要的作用。近年来,研究给电子体的作用机理以及寻找新型的给电子体是该领域的热点,也是Ziegler-Natta催化剂的发展方向。文中综述了近年来在新型给电子体的开发方面的进展,如内给电子体的二醚类化合物,外给电子体的硅烷类等,并总结了有关给电子体作用机理的一般性规律,最后,对该领域的发展进行了展望。

ELECTRON DONORS IN ZIEGLER-NATTA CATALYSTS FOR PROPYLENE POLYMERIZATION AND ITS MECHANISM

Electron donors in Ziegler-Natta catalysts have very important effects on the improvement of stereoregularity for Polypropylene, but the mechanism behind the effects is not understood clearly, which results in some difficulty on the development and application of new electron donor, in recent years, the researches on effect mechanism and to seek new electron donors have been carried out very popularly, which also is the direction to improve Ziegler-Natta catalysts. In this paper, the progress in development of new electron donors, such as the diether as internal donor and alkoxysilane as external donor, was reviewed, also the effects of electron donor on stereoregularity of PP were introduced, and some general accepted conclusions about the mechanism were summarized, in the end, the development in this area was prospected.