CAS Number 206451-54-9
·
Linear Formula [(CH3)0.95(n-C8)H17]0.05AlO]n
Methylaluminoxane, commonly called MAO, is a white solid with the general formula (Al(CH3)O)n.
Detailed Description:
Uses
MAO is most well known for being a co-catalyst for olefin polymerizations of the Ziegler-Natta type. Natta and
Ziegler utilised trimethylaluminium (TMA) as a co-catalyst, and it was not
until the mid-1970s that Kaminsky discovered the utility of MAO for
catalysis (see Kaminsky catalyst).[5] He noticed that a
small amount of water enhanced the polymerizing activity in the Ziegler-Natta
system and deduced that water must react with trimethylaluminum to give MAO[6] It is believed that
MAO alkylates and then activates the metal-chloride pre-catalyst species,
forming an ion
pair which should allow ethene insertion[7]
In polymerisations MAO also functions as a scavenger.
Alternatives
Due to the unknown structure and mechanism of MAO,
alternatives have been found in tetrakisperfluoroarylborate salts such as tetrakis[3,5-bis(trifluoromethyl)phenyl]borate anion (BArF4−).
Such well-defined activators may be used stoichiometrically, whereas MAO is
typically present in a reaction mixture in approximately hundredfold to
thousandfold excess.
PRICES
$2605.65/KG OR $1184.38/IB
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