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New polymers by copolymerization of ethylene and norbornene with metallocene catalysts
Author(s) -
Kaminsky Walter,
Tran PhuDennis,
Werner Ralf
Publication year - 2004
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.200450911
Subject(s) - methylaluminoxane , norbornene , metallocene , copolymer , materials science , polymer chemistry , ethylene , catalysis , post metallocene catalyst , polymer , thermal stability , glass transition , polymerization , organic chemistry , chemistry , composite material
To increase the thermal stability of metallocene‐methylaluminoxane catalysts. pentalene bridged zirconocenes and a constrained geometry catalyst were used for the copolymerisation of ethene and norbornene. The constrained geometry catalyst is stable in solution up to 90°C. Surprisingly the molecular weight of the copolymers increases with higher incorporation rates of norbornene. Glass transition temperatures of 120°C are reached. The microstructure of the cyclic olefin copolymers material is more alternating.