31 complexes of bis - (benzimidazole, benzothiazole and benzoxazole) compounds with Ti (IV) metal centers were synthesized, characterized, activated with methylalumoxane (MAO) and then tested for catalytic ethylene polymerization. The activities of the various catalysts were found to be functions of the hetero atoms in the ligand frameworks. The highest activity was obtained with 39 / MAO (573 kg PE / mol cat. h). The produced polyethylenes showed high molecular weights (up to 1.5 ×106 g/mol) and broad molecular weight distributions (PD = 65). This could result from different interactions of the MAO counterion with the heteroatoms of the catalyst ligand generating different active sites.
合成了31个双-(
苯并咪唑、
苯并噻唑和
苯并恶唑)化合物与
钛(IV)
金属中心的配合物,进行了表征,并用甲基铝氧烷(MAO)激活,然后测试了其在催化
乙烯聚合中的活性。各种催化剂的活性被发现与
配体框架中的杂原子有关。39 / MAO获得了最高活性(573 kg PE / mol cat. h)。所产生的聚
乙烯具有高分子量(最高可达1.5 × 10^6 g/mol)和宽的分子量分布(PD = 65)。这可能是由于MAO反离子与催化剂
配体中的杂原子之间不同的相互作用生成了不同的活性位点。