A new Salan zirconium complex is synthesized and tested as a precatalyst for the polymerization of ethylene and higher a-olefins. Its catalytic behavior is compared to that of a previously reported and related Salen zirconium complex. Analysis of the produced polyolefins reveals that the two different catalytic systems produce polymers with the same microstructure: atactic polymers from propene versus highly isotactic polymers from higher a-olefins. The identification of the end groups indicates a prevailing primary regiochemistry of polyinsertion of the a-olefins for both Salan and Salen zirconium complexes. These observations strongly suggest the formation of very similar active species in both systems.

A comparative study on the polymerization of alpha-olefins catalyzed by Salen and Salan zirconium complexes

STRIANESE, MARIA;LAMBERTI, Marina;MAZZEO, Mina;PELLECCHIA, Claudio
2008

Abstract

A new Salan zirconium complex is synthesized and tested as a precatalyst for the polymerization of ethylene and higher a-olefins. Its catalytic behavior is compared to that of a previously reported and related Salen zirconium complex. Analysis of the produced polyolefins reveals that the two different catalytic systems produce polymers with the same microstructure: atactic polymers from propene versus highly isotactic polymers from higher a-olefins. The identification of the end groups indicates a prevailing primary regiochemistry of polyinsertion of the a-olefins for both Salan and Salen zirconium complexes. These observations strongly suggest the formation of very similar active species in both systems.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1854703
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