INFLUENCE OF BATCH REACTION CONDITIONS CAN NORBORNENE ETHYLENE COPOLYMERS MADE USING C-2V-SYMMETRICAL AND C-S-SYMMETRICAL METALLOCENE/MAO CATALYSTS/

The norbomene/ethylene copolymerization was studied using C-2v- and C- s-symmetric metallocene catalysts in the presence of methylaluminoxane as a cocatalyst. The batch reactions were carried out at four differe nt temperatures copolymerizing a constant amount of ethylene with the appropriate amount of norbornene. The activity decreases for the Cp2Zr Cl2 catalyst and increases to a constant level for the [Ph2C(Flu)(Cp)] ZrCl2 catalyst when the norbornene/ethylene ratio in the reaction incr eased. The highest activities and the highest norbornene contents in t he copolymers were achieved using the [Ph2C(Flu)(Cp)]ZrCl2. The micros tructure of the copolymer determined with C-13 NMR was observed to dep end on catalyst, temperature and monomer ratio. Cp2ZrCl2 produces more norbornene blocks as a function of norbornene content in the copolyme r and longer norbornene sequences than [Ph2C(FIu)(Cp)]ZrCl2. The corre lation between the increasing norbornene content in the copolymer and the increasing glass transition temperature is more obvious for [Ph2C( Flu)(Cp)]ZrCl2.