Aluminoxane

Aluminoxane

Aluminoxanes refer to compounds that are obtained by the partial hydrolysis of trialkylaluminium compounds. Aluminoxanes serve as activators for catalytic olefin polymerisation, such as the Ziegler-Natta catalyst. They also serve a function as scavenger for impurities (e.g. water) in reactions that are sensitive to these impurities.

Examples of aluminoxanes include:
* Triisobutylaluminoxane (TiBAO), formed by the hydrolysis of triisobutylaluminium
* Methylaluminoxane (MAO), formed by the hydrolysis of trimethylaluminium

The hydrolysis of trialkylaluminium compounds is a highly exothermic process, and the starting trialkylaluminium compounds are often pyrophoric (i.e. burns on contact with air).

References


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Look at other dictionaries:

  • aluminoxane — noun a class of organometallic compounds of aluminium having general formula RAl O AlR; they are used as catalysts in the polymerization of epoxides and oxetanes to form polyether elastomers Syn: Vandenberg catalyst …   Wiktionary

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  • Methylaluminoxane — Identifiers Properties Molecular formula (Al(CH3)xOy)n Appearance white solid Hazards Main hazards …   Wikipedia

  • Vandenberg catalyst — noun an aluminoxane, prepared from an alkyl aluminium and water, used as a catalyst in the manufacture of polyether elastomers …   Wiktionary

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