An NMR Analysis of Coordination of Alkoxysilane Compounds on MgCl₂-Supported Ziegler-Natta Catalyst

Abstract

NMR was used to study the interaction between alkoxysilane compounds and a MgCl₂-supported Ziegler-Natta catalyst (MgCl₂/TiCl₄/dibutyl phthalate). ²⁹Si NMR data indicated the interaction of alkoxysilane compounds with MgCl₂ on the solid-catalyst, but not with TiCl₄. Moreover, we found a correlation between the ²⁹Si chemical shift of the alkoxysilane compounds and isotactic or atactic polymerization rate in the propylene polymerization.