HIGHLY ISOTACTIC POLYPROPENE PREPARED WITH HYL-4-T-BUTYL-CYCLOPENTADIENYL)ZIRCONIUMDICHLORIDE - AN NMR INVESTIGATION OF THE POLYMER MICROSTRUCTURE

Citation
B. Rieger et al., HIGHLY ISOTACTIC POLYPROPENE PREPARED WITH HYL-4-T-BUTYL-CYCLOPENTADIENYL)ZIRCONIUMDICHLORIDE - AN NMR INVESTIGATION OF THE POLYMER MICROSTRUCTURE, Journal of molecular catalysis, 82(1), 1993, pp. 67-73
Citations number
14
Categorie Soggetti
Chemistry Physical
ISSN journal
03045102
Volume
82
Issue
1
Year of publication
1993
Pages
67 - 73
Database
ISI
SICI code
0304-5102(1993)82:1<67:HIPPWH>2.0.ZU;2-0
Abstract
Isotactic polypropene was prepared using hyl-4-t-butyl-cyclopentadieny l)zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures be tween 0 and 80-degrees-C and with Al/Zr ratios of 300 and 1500. The po lymers, prepared at temperatures below 30-degrees-C had melting points of 162-degrees-C and above. The chain ends were determined by means o f distortionless enhancement by polarization transfer (DEPT)-NMR spect roscopy. The pentad intensities were corrected according to the chemic al shifts of the end groups. The intensity distributions are shown to arise from enantiomorphic site control of the chiral catalyst species.