ADVANCES IN THE C-13 NMR MICROSTRUCTURAL CHARACTERIZATION OF PROPENE POLYMERS

This paper presents the main results of a high-resolution 150 MHz C-13 NMR characterization of polypropene samples prepared in the presence of a number of last-generation Ziegler-Natta catalyst systems. The con figurational analysis of the polymers, in particular, was expanded fro m the pentad level (normally afforded by routine spectra) to the nonad level. This proved to be beneficial in mechanistic studies on the ori gin of the stereospecificity.