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Propylene Polymerization with Bis(phenoxy‐imine) Group‐4 Catalysts Using i Bu 3 Al/Ph 3 CB(C 6 F 5 ) 4 as a Cocatalyst
Author(s) -
Saito Junji,
Onda Mitsuhiko,
Matsui Shigekazu,
Mitani Makoto,
Furuyama Rieko,
Tanaka Hidetsugu,
Fujita Terunori
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200290005
Subject(s) - tacticity , polymerization , polymer chemistry , catalysis , imine , materials science , melting point , crystallography , polymer , chemistry , organic chemistry , composite material
The catalytic behavior of three bis(phenoxy‐imine) group‐4 transition‐metal complexes (M = Ti, Zr, Hf), with i Bu 3 Al/Ph 3 CB(C 6 F 5 ) 4 cocatalyst systems towards propylene polymerization was investigated under atmospheric pressure at 25 °C. The Ti complex produced ultrahigh‐molecular‐weight atactic poly(propylene), whereas Zr and Hf complexes formed high‐molecular‐weight isotactic poly(propylene)s via a site‐control mechanism. The isotactic poly(propylene) obtained with the Hf complex displayed a high melting temperature of 123.8 °C.