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Metallocene-Catalyzed Polymerization in Nonaqueous Fluorous Emulsion

✍ Scribed by Svetlin Nenov; Christopher G. Clark Jr.; Markus Klapper; Klaus Müllen

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
238 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

A nonaqueous organic‐in‐fluorous emulsion applicable for polymerization using water‐sensitive catalysts is presented. With statistical biphasic copolymers based on poly(4‐hydroxystyrene) containing fluorinated and nonfluorinated alkyl side chains, emulsions of hydrocarbons dispersed in perfluorocarbons were stabilized. The addition of metallocenes, activated by methylalumoxane (MAO), enabled the polymerization of olefins inside this highly hydrophobic system. High molecular weight polyolefin nanoparticles ($\overline M _{\rm n}$ up to 450 000) of polyethylene and poly(propylene) were synthesized without supporting the catalyst and without reactor fouling. In this diffusion‐controlled process, the sizes of the particles were controlled by the reaction time and the ratio of the emulsifier to solvents.

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