首页|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

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

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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6.51×106 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 × 104 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％.
Nickel catalysts with asymmetric steric hindrance for ethylene polymerization
α-Diimide catalysts have attracted widespread attention due to their unique chain walking characteristics.A series of α-diimide nickel/palladium catalysts with different electronic effects and steric hindrances were designed and syn-thesized for olefin polymerization.In this work,we synthesized a series of asymmetric α-diimide nickel complexes with different steric hindrances and used them for ethylene polymerization.These nickel catalysts have high ethylene polymer-ization activity,up to 6.51 × 106 g mol-1·h-1,and the prepared polyethylene has a moderate melting point and high molecu-lar weight(up to 38.2 × 104 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-diiminenickel complexpolyethylenepolymerizationasymmetric steric hindrance

田万露、王福周、邹陈

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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

α-二亚胺 镍催化剂 聚乙烯 聚合 不对称位阻

National Natural Science Foundation of ChinaUSTC Research Funds of the Double First-Class InitiativeOverseas Students Innovation and Entrepreneurship Support Program Project of Anhui ProvinceKey R&D Projects in Anhui ProvinceNatural Science Foundation of HefeiExcellent Research and Innovation Team Project of Anhui Province

52203016YD99900020182021LCX0222022i0102001220220392022AH010001

2024

10.52396/JUSTC-2024-0001

中国科学技术大学学报
中国科学技术大学

中国科学技术大学学报

CSTPCD北大核心
影响因子：0.421
ISSN：0253-2778
年,卷(期)：2024.54(6)