Activation and Polymerisation of ansa-Zirconocene Chloroamido Complexes

Propene polymerisation was conducted with three ansa-zirconocene complexed: Me 2 Si(2-Me-4-PhInd) 2 -Zrcl 2 (A), Me 2 Si(2-Me-4-PhInd) 2 ZrClNMe 2 (B) and Me 2 Si-(2-Me-4-PhInd) 2 ZrClNEt 2 (C). Methylalumoxane (MAO) or [HNPhMe 2 ][B(C 6 F 5 ) 4 ] was used as cocatalyst. The influence of cocatalysts and triisobutylaluminum (TIBA) on polymerisation activity, molecular weight and polymer microstructure was studied. Futhermore, the alkylation and activation of the complexes were axamined using UV/VIS measurements, all complexes have low reactivity towards TMA and TIBA. Similar cationic species were formed of all three studied zirconocenes in the reaction with MAO. Additional TIBA did not affect the type of active species formed in the reaction of zirconocene and MAO, but increased the activity of B and C.