Analysis of stereodefects in highly sydiotactic polypropylene by calculation of ~(13)C-NMR chemical shifts

摘要

Being the developments of the new catalyst systems and the outstanding performances, sydiotactic polypropylene (SPP) is becomeing one of the new potential polymers in very recent years. Even the most efficient catalyst s ystems can be expected to be something less than perfect in the polymer chain propagation, it is important to obtain the information about the nature of stereodefects. ~(13)C-NMR spectroscopy ~([1,2,3,4]) has been demonstrated as the most powerful experimental probe of stereoconfiguration in the polypropylene.