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Active sites deterioration of MgCl 2 ‐supported catalyst induced by the electron donor extraction by alkylaluminium
Author(s) -
Matsuoka Hitoshi,
Liu Boping,
Nakatani Hisayuki,
Nishiyama Isa,
Terano Minoru
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.942
Subject(s) - polymerization , ziegler–natta catalyst , extraction (chemistry) , electron donor , catalysis , polymer , propene , chemistry , polymer chemistry , natta , chemical engineering , materials science , chromatography , organic chemistry , engineering
To investigate the role of the internal donor in a Ziegler–Natta catalyst, the nature and existing states of the internal donor were intentionally varied by alkylaluminium treatment before polymerization, and the catalytic properties during propene polymerization were accurately evaluated using the stopped‐flow method. A significant decrease in the amount of the remaining internal donor was observed during the initial stage of the extraction. The polymerization results show a gradual decrease in the polymer isotacticity with an increase in the extraction time. These different patterns, as a function of the extraction time, indicate that the amount of the remaining internal donor is not directly related to the isotacticity of the produced polymer. © 2002 Society of Chemical Industry