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The Development of Stereoerrors During the Homo‐ and Copolymerization of Propylene Using C 2 ‐Symmetric Metallocene Catalysts – A Cautionary Note
Author(s) -
van Reenen Albert J.,
Lutz Marietjie
Publication year - 2004
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400083
Subject(s) - tacticity , metallocene , copolymer , polymer chemistry , catalysis , zirconium , polymer , materials science , post metallocene catalyst , polymer science , chemistry , organic chemistry , polymerization , composite material
Summary: A recent paper described the development of atactic sequences during the copolymerization of propylene and 1‐pentene using the C 2 ‐symmetric metallocene catalyst rac ‐dimethylsilyl‐bis(2‐methylbenz(e)indenyl) zirconium dichloride. We have found similar stereoerrors, and showed that atactic material could in fact be extracted from the material, indicating that the catalyst in question had probably isomerized in solution, leading to a mixture of isotactic and atactic polymers.