Nickel catalysts with asymmetric steric hindrance for ethylene polymerization  

具有不对称位阻的α-二亚胺镍催化剂的合成及其催化乙烯聚合性能研究

作　　者：Wanlu Tian Fuzhou Wang Chen Zou 田万露;王福周;邹陈(中国科学技术大学合肥微尺度物质科学国家研究中心,安徽合肥230026;安徽大学物质科学与信息技术研究院,安徽合肥230601)

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [2]Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China

出　　处：《中国科学技术大学学报》2024年第6期48-52,59,I0010,I0011,共8页JUSTC

基　　金：supported by the National Natural Science Foundation of China(52203016);the USTC Research Funds of the Double First-Class Initiative(YD9990002018);the Overseas Students Innovation and Entrepreneurship Support Program Project of Anhui Province(2021LCX022);the Key R&D Projects in Anhui Province(2022i01020012);the Natural Science Foundation of Hefei(2022039);the Excellent Research and Innovation Team Project of Anhui Province(2022AH010001).

摘　　要：α-Diimide catalysts have attracted widespread attention due to their unique chain walking characteristics.A series ofα-diimide nickel/palladium catalysts with different electronic effects and steric hindrances were designed and synthesized for olefin polymerization.In this work,we synthesized a series of asymmetricα-diimide nickel complexes with different steric hindrances and used them for ethylene polymerization.These nickel catalysts have high ethylene polymerization activity,up to 6.51×10^(6)g·mol^(−1)·h^(−1),and the prepared polyethylene has a moderate melting point and high molecular weight(up to 38.2×10^(4)g·mol^(−1)),with a branching density distribution between 7 and 94 branches per 1000 carbons.More importantly,the polyethylene prepared by these catalysts exhibits excellent tensile properties,with strain and stress reaching 800%and 30 MPa,respectively.α-二亚胺催化剂因其独特的“链行走”特征而受到广泛关注,学术界设计合成了一系列具有不同电子效应和空间位阻的α-二亚胺镍/钯催化剂用于烯烃聚合的研究。本文合成了一系列具有不同空间位阻的不对称型α-二亚胺镍配合物,并研究了它们的乙烯聚合行为。研究发现,这些镍催化剂具有较高的乙烯聚合活性,可达6.51×10^(6)g·mol^(−1)·h^(−1),其制备的聚乙烯具有适中的熔点和较高的分子量(高达38.2×10^(4)g·mol^(−1)),且支化密度分布在7/1000 C至94/1000 C之间。更重要的是,这些催化剂制备的聚乙烯具有优异的拉伸性能,拉伸强度和断裂伸长率分别可达30 MPa和800%。

关 键 词：Α-DIIMINE nickel complex POLYETHYLENE POLYMERIZATION asymmetric steric hindrance 

分 类 号：TQ426[化学工程] TQ325.1