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All 13 C NMR resonances of microblock-free ethene/norbornene copolymers can be assigned to the corresponding pentads, because the spectra are much simpler than those of copolymers containing norbornene microblocks. The copolymers obtained by copolymerizations in the presence of Pr i [(3-Pr i -Cp)Flu]ZrCl 2 are analyzed in view of this. The mechanism responsible for an alternating microstructure in these copolymers is compared with that proposed previously. The structure of a metallocene catalyst used to make an microblock-free ethene/norbornene copolymer is shown in the Scheme.
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Full Paper: Copolymerizations of ethylene with 1,7-octadiene (OD) and 1,9-decadiene (DD) are conducted in the presence of various non-bridged and bridged zirconocene catalysts using methylisobutylaluminoxane as the cocatalyst. In the case of ethylene/OD copolymerization, the ligand structure of the
When conducted in suitable conditions, the polymerization of ethylene in the presence of 1,4-bis(2,6-diisopropylphenyl)acenapththenediiminenickel(II) dichloride (1) and methylaluminoxane (MAO) produces hyperbranched polyethylene (HBPE). The product shows high molecular weight and more than 218 branc