Effects of the catalyst system on the crystallization of polypropylene*

✍ Scribed by Markus Gahleitner; Claudia Bachner; Ewa Ratajski; Gerald Rohaczek; Wolfgang Neißl

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 152 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990919)73:12<2507::aid-app19>3.0.co;2-v

✦ Synopsis

In search of a better understanding of catalyst effects on final product qualities of polypropylene, an attempt was made to establish a correlation between catalyst type, polymer chain structure of homopolymers, crystallization behavior, as well as final morphology and mechanical properties. Conventional Ziegler-Natta catalyst systems as well as novel metallocene catalysts were investigated, and influences of molar mass distribution and chain regularity were investigated as separate factors. Metallocene-based isotactic polypropylene shows some special effects regarding the nucleation density and the correlation between stereoregularity and mechanics that do not fit into the general picture for Ziegler-Natta catalyst based products.