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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents



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ID: 192714.0, MPI für Festkörperforschung / FKF Publikationen 2004
Theoretical Studies of the Structure and Function of MAO (Methylaluminoxane)
Authors:Zurek, E.; Ziegler, T.
Language:English
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Progress in Polymer Science
Volume:29
Issue / Number:2
Start Page:107
End Page:148
Review Status:not specified
Audience:Not Specified
Abstract / Description:Single-site homogeneous catalysts need to be activated by a co-catalyst
or counterion. The high activity imparted by methylaluminoxane (MAO)
has caused it to be one of the most important co-catalysts. In fact it
can be argued that the success of the metallocenes is largely due to
the discovery of MAO. However, despite intensive studies MAO has
remained a 'black box'. The presence of multiple equilibria between
different (AlOMe)(n) oligomers coupled with the interaction between MAO
and TMA has hindered experimental structural assignment of MAO. This
has made it nearly impossible to characterize the dormant and active
species present in olefin polymerization and therefore to theoretically
investigate the mechanism of this process. Moreover, the binding of MAO
with porous inorganic oxides such as silica, alumina and MgCl2 is
currently not understood. Perhaps, even more puzzling is the fact that
a large excess of MAO is necessary in order for polymerization to occur
(Al:catalyst ratios of similar to10,000:1), whereas in the case of
supported MAO this ratio is greatly decreased (ratios of similar
to100:1-500:1). Despite the fact that the co-catalytic ability of MAO
was discovered nearly 25 years ago, its exact structure and function is
still unknown. In recent years, theoretical studies of MAO aiming to
give further insight into the aforementioned issues have emerged. In
this article, we give a quick overview of experimental studies of MAO
and an in-depth review of recent theoretical investigations. (C) 2003
Elsevier Ltd. All rights reserved.
Free Keywords:methylaluminoxane; theoretical/computational studies; homogeneous
catalysis; olefin polymerization; counterion
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada.
Identifiers:ISI:000189185100002 [ID No:1]
ISSN:0079-6700 [ID No:2]
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