Polymerization of conjugated dienes and olefins promoted by cobalt complexes supported by phosphine oxide ligands
作者:Dang Yang、Qiao Gan、Huafeng Chen、Weilun Ying、Junyi Zhao、Xiaoyu Jia、Dirong Gong
DOI:10.1016/j.ica.2019.119046
日期:2019.10
catalysts and polymerization conditions. Isoprene was found to be more active than myrcene, and butadiene in the case of Co1/AlEt2Cl, suggestive of compromised sterical and electronic effect from the alkyl group at 2-positon of monomers. The Co1/AlEt2Cl system is also moderately active in polymerizations of methyl methacrylate and styrene. Therefore, the current catalysts provided dual polymerization reactivities
摘要由氧化膦(P = O)供体负载的四种钴配合物(9,9-二甲基-9H--吨-4,5-二基)双(二苯基氧化膦)二氯化钴(Co1),(9,9-二甲基-9H -x吨-4,5-二基)双(二苯基氧化膦)溴化钴(Co2),N,N'-(吡啶-2,6-二基吡啶)双(P,P-二叔丁基次膦酰胺)二氯化钴(制备并表征了N,N'-(吡啶-2,6-二吡啶)双(P,P-二叔丁基次膦酰胺)二氯化钴(Co4)。考察了它们在异戊二烯,丁二烯,月桂烯以及MMA和苯乙烯聚合反应中的催化性能。与AlEt2Cl结合使用时,Co1和Co2能够将异戊二烯转化为聚异戊二烯,而Co3和Co4的活性非常低。所得的聚异戊二烯是顺式1,4和3,4异构体的混合物,其比例不受催化剂类型和聚合条件的显着影响。发现异戊二烯比月桂烯和丁二烯更具活性,而在Co1 / AlEt2Cl的情况下,提示单体2位正烷基的空间和电子效应受到损害。Co1 / AlEt