Ethylene/Norbornene Copolymerization with iPr(Cp)(Flu)ZrCl2 Catalyst: Effect of MAO Cocatalyst and 3rd Monomer

The copolymerization of ethylene and norbornene (N) was carried out with iPr(Cp)(Flu)ZrCl 2 catalyst and modified methylaluminoxane (MMAO) cocatalyst. The catalytic activity was dependent on the structure of MMAO, i.e., MMAO-4 exhibited higher catalyst activity than MMAO-3A containing more i-butyl groups. The glass transition temperature (T← 1 g) and the composition of the produced copolymer were not affected by MMAO type. With styrene derivatives as 3 r monomer, T g of copolymer increased while the catalytic activity decreased. With the addition of 3 rd monomer, not only the content of 3 rd monomer but also the content of N increased.