Wannida Apisuk, Alexandra G. Trambitas, Boonyarach Kitiyanan, Matthias Tamm and Kotohiro Nomura Efficient ethylene/norbornene copolymerization by half-titanocenes containing imidazolin-2-iminato ligands and MAO catalyst systems Journal of Polymer Science Part A: Polymer Chemistry 51
Half-titanocenes containing imidazolin-2-iminato ligands, CpTiCl2[1,3-tBu2(CHN)2CN], exhibit remarkable catalytic activities with better norbornene (NBE) incorporations for ethylene copolymerization with norbornene in the presence of the methylaluminoxane (MAO) cocatalyst. This affords high-molecular-weight copolymers with uniform molecular weight distributions and high NBE contents (high glass transition temperature, Tg = 230–258 °C). The microstructure analysis of the poly(ethylene-co-NBE)s suggests the formation of random copolymers, including two and three NBE repeating units.
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