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Polymerization of ethylene and ethylene/1‐hexene over Ziegler–Natta/metallocene hybrid catalysts supported on MgCl 2 prepared by a recrystallization method
Author(s) -
Cho Han Seock,
Chung Jin Suk,
Han Jae Hyuck,
Ko Young Gwan,
Lee Wha Young
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19981128)70:9<1707::aid-app8>3.0.co;2-#
Subject(s) - natta , metallocene , 1 hexene , materials science , ethylene , polymerization , recrystallization (geology) , polymer chemistry , catalysis , chemical engineering , polymer science , composite material , chemistry , organic chemistry , polymer , paleontology , engineering , biology
MgCl 2 for use as a catalyst support was prepared by dissolution in methanol and recrystallization in n ‐decane, followed by vacuum‐drying at 2,000 rpm. The prepared support was modified by treatment with alkylaluminum compounds. The activity profile of ethylene over the supported catalysts persisted for periods up to 1 h during the polymerization. The prepared Ziegler–Natta/metallocene hybrid catalysts exhibited the characteristics of both metallocene and Ziegler–Natta catalysts. The polymer produced by the hybrid catalysts gave bimodal peaks in differential scanning calorimetry analysis for ethylene and ethylene/1‐hexene polymerization, suggesting that the polymer was composed of two different lamellar structures that were polymerized by each catalyst. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1707–1715, 1998