After the discovery of single center metallocene catalysts in the 1980s highly stereoregular
syndiotactic polypropylene showing high crystallinity and melting temperature has been …

A detailedanalysis is made of the 13C NMR spectra of ethylene-propylene rubbersat high
field. The complex spectral features are interpreted as resulting from ethylene-propylene …

In the last few years remarkable advances have been made in the field of non-
cyclopentadienyl complexes as homogeneous olefin polymerization catalysts. In this paper …

Large, highly regularsingle crystals of syndiotactic polypropylene (sPP), grown for the first
time and examined by electron microscopy and electron diffraction, reveal extra reflections …

Isotactic polypropyleneand poly (l-butene) have been prepared in the presence of
stereorigid chiral titanocenes and13C-enriched organoaluminum compounds. The …

Abstract 13 C nuclear magnetic resonance (nmr) spectra were obtained at 67.8 MHz for
highly isotactic polypropylene polymerized with a Ziegler-Natta catalyst. The tactic heptad …

The influence of the degree of stereoregularity on the overall rate of crystallization and on
the melting behaviour of fractions of isotactic polypropylene has been investigated. Fractions …

The syndiotactic‐specific polymerization of propylene can be promoted by single‐site
catalysts based on vanadium, nickel and group IV metals. The polymerization mechanisms …

The article discusses two subjects:(a) temperature effects on the molecular weight,
molecular weight distribution and stereoregularity of crystalline fractions of propylene …

Theoretical 13C NMR spectra for the methylene carbon of two polypropylene samples were
obtained by assuming the chemical shifts calculated for C9 of 2, 4, 6, 8, 10, 12, 14, 16 …