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Emprego de catalisadores à base de níquel para homo- e copolimerização de estireno

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Author(s): Ferreira Jr. Luis Carlos | Costa Marcos A. S. | Santa Maria Luiz Claudio de | Coutinho Fernanda M. B. | Guimarães Pedro I. C.

Journal: Química Nova
ISSN 0100-4042

Volume: 27;
Issue: 6;
Start page: 925;
Date: 2004;
Original page

Keywords: nickel catalysts | polystyrene | styrene copolymers

ABSTRACT
This review deals with the homo- and copolymerization of styrene with nickel catalysts. The catalytic activity, polymer stereoregularity, polymer molecular weight and polydispersity are dependent upon nickel ligands and reaction parameters. Catalysts supported on silica, treated with methylaluminoxane (MAO), have shown higher stereospecificity and activity compared to homogeneous ones. The influence of these parameters is discussed focusing on the elucidation of some aspects of the polymerization mechanism.
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