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Stereospecific oligo‐ and polymerization with metallocene catalysts
Author(s) -
Kaminsky Walter
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950890121
Subject(s) - methylaluminoxane , metallocene , stereospecificity , polymer chemistry , polymerization , selectivity , catalysis , tacticity , chemistry , polymer , materials science , organic chemistry
The regio‐ and stereo‐selectivity of metallocene/methylaluminoxane catalysts was shown to be significantly and rapidly enhanced by substitution of the indenyl ligands and by heterogenization of the zirconocenes. By oligomerization of 1‐butene with optically active metallocenes, it could be shown that there is a small influence from the growing polymer chain on the isotacticity, the overriding factor in every case being the existence of a chiral active centre. Each insertion step increased the stereospecificity, until the maximum value was achieved.