Living random copolymerization of ethene and norbornene using ansa-fluorenylamidodimethyltitanium complex



Ethene-norbornene copolymerizations were conducted by (t-BuNMe2SiFlu)TiMe2 (1) activated with dried methylaluminoxane (MAO) (free from Me3Al) at 0°C and 20°C under atmospheric pressure of ethene at various norbornene concentrations. At 0°C and high norbornene concentration, the molecular weight of the copolymer increased linearly against polymerization time while keeping narrow molecular-weight distribution. The 13C NMR spectrum revealed that random copolymer with 53 mol-% of norbornene was obtained. The glass transition temperature was above 150°C.