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Highly isospecific, immobilized zirconocene catalysts supported on chemically modified SiO 2
Author(s) -
Soga Kazuo
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950890125
Subject(s) - tacticity , catalysis , metallocene , materials science , ionic bonding , chemical engineering , polymer chemistry , melting temperature , organic chemistry , chemistry , composite material , polymer , polymerization , ion , engineering
Most of the supported metallocene catalysts reported so far have been devised to immobilize metallocenes on the solid surface utilizing the ionic interactions between metallocenes and surface active sites. Whereas, we have been challenging to prepare more rigidly immobilized catalysts by using the chemically modified SiO 2 . The SiO 2 ‐supported zirconocene catalysts thus prepared could be activated by ordinary trialkylaluminiums like Al(i‐C 4 H 9 ) 3 to give highly isotactic polypropene (PP) with high melting temperature (Tm) and number‐average molecular weight (Mn). This paper summarizes the results obtained so far.