product. Complexes 1 and 2 were tested for their catalytic activities for the polymerization of ethylene after activation with methylaluminoxane (MAO). Active polymerization catalysts were formed in situ with MAO and that catalyzed the polymerization of ethylene to high-density linear polyethylene. The effects of co-catalyst concentration and temperature are reported. The optimum co-catalyst to catalyst
具有2,6-
吡啶二羰基连接基,RR'pz(CO)} 2 py,R = R'= t Bu(L1)的一系列
吡唑基化合物;R = R'= Me(
L2); R = R'= H(L3)中,R = H,R'=我(L4)已经从2,6- pyridinedicarbonyl酰
氯与适当的
吡唑和弱碱的反应来制备。
配体L1 – L3与Pd(NCMe)2 Cl 2反应形成单核络合物,而与L4的反应产生难以处理的产物。配合物1和2在用甲基铝氧烷(MAO)活化后,测试了它们对
乙烯聚合的催化活性。用MAO原位形成活性聚合催化剂,该催化剂催化
乙烯聚合成高密度线性聚
乙烯。报告了助催化剂浓度和温度的影响。助催化剂与催化剂的最佳比例为3000:1,且由于催化剂失活,催化剂活性在40°C以上下降。