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Donor/Acceptor Metallocenes: A New Structure Principle in Catalyst Design
Author(s) -
Ostoja Starzewski K. Aleksander,
Kelly W. Mark,
Stumpf Andreas,
Freitag Dieter
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19990816)38:16<2439::aid-anie2439>3.0.co;2-e
Subject(s) - materials science , polyolefin , catalysis , acceptor , amorphous solid , polymerization , thermoplastic elastomer , thermoplastic , yield (engineering) , polymer chemistry , chemical engineering , polymer , crystallography , composite material , organic chemistry , chemistry , copolymer , physics , layer (electronics) , condensed matter physics , engineering
Suitable as highly effective polymerization catalysts is the new class of donor/acceptor metallocenes in which the rotation of the two π ligands is restricted through the formation of a dative D + →A − bond (see picture). Specifically optimized substitution patterns yield excellent properties for the synthesis of high‐melting, highly crystalline thermoplastic materials, amorphous thermoplastic materials with high glass transition temperatures as well as polyolefin elastomers with low glass T g .