第三组分对茂金属催化乙烯与降冰片烯共聚的影响OA北大核心CSTPCD

To catalyze the copolymerization of ethylene and norbornene(NBE),Ph2C(Cp)(Flu)ZrCl2 was used as the main catalyst and methylaluminoxane(MAO)or the combination of organoboron and organoaluminum as the co-catalysts,with sterically hindered phenols introduced as the third component(TC).The resulted polymer was characterized by GPC,DSC,and 13C NMR,and the effects of TCs on NBE incorporation,polymerization activity,polymer molecular weight,and glass transition temperature were studied.Results show that the introduction of TCs can improve the incorporation of NBE and affect the distribution of NBE in the polymer chain.At the same time,in the MAO-activated catalytic system,the polymerization activity decreases and the molecular weight of the polymer increases,while the catalytic system activated by the combination of organoboron and organoaluminum shows the opposite behavior.