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External Donor Induced Direct Contact Effects on Mg(OC 2 H 5 ) 2 ‐Based Ziegler‐Natta Catalysts for Propylene Polymerization
Author(s) -
Kim Sang Yull,
Hiraoka Yuichi,
Taniike Toshiaki,
Terano Minoru
Publication year - 2009
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.200951114
Subject(s) - natta , catalysis , polymerization , slurry , ziegler–natta catalyst , materials science , chemistry , polymer chemistry , chemical engineering , organic chemistry , composite material , polymer , ethylene , engineering
Effects of external donor induced direct contact without alkylaluminum were studied for Ziegler‐Natta catalysts containing monoester and diester as internal donors on the catalytic performances such as activity and stereoselectivity. Traditional slurry polymerizations were carried out for rather short period after direct contact for a variety of time. GC analysis was also performed to observe replacement phenomena of donors during direct contact. It was postulated that the different performances of the catalysts were greatly affected by the pair of internal and external donors.