| 초록 |
The electron donor (Lewis Base) in typical Ziegler-Natta catalyst system is divided into two types: the internal donor (ID) is added in the preparation of catalyst, while the external donor (ED) is used at the polymerization process. These donors exhibit the significant effects on the polymerization behaviors in polyolefin preparation. In this presentation, the polymerization of propylene was initiated with the Ziegler–Natta catalysts of various IDs such as aromatic and aliphatic diesters as well as diether. Without any ED (dialkoxysilane), the catalyst with aliphatic diester and diether contrast to that with aromatic diester ID, gave the reasonable catalyst activity and isotacticity in propylene polymerization. In addition, the Ziegler–Natta catalysts of various IDs exhibited the different hydrogen responsibility and molecular weight distribution of obtained polymer. The copolymerization behaviors of various catalysts for propylene, ethylene and 1-butene were also investigated. |
