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
Nickel catalysts with asymmetric steric hindrance for ethylene polymerization
田万露 1王福周 2邹陈3
作者信息
- 1. 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
- 2. 安徽大学物质科学与信息技术研究院,安徽合肥 230601
- 3. 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
- 折叠
摘要
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％.
Abstract
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.
关键词
α-二亚胺/镍催化剂/聚乙烯/聚合/不对称位阻Key words
α-diimine/nickel complex/polyethylene/polymerization/asymmetric steric hindrance引用本文复制引用
基金项目
National Natural Science Foundation of China(52203016)
USTC Research Funds of the Double First-Class Initiative(YD9990002018)
Overseas Students Innovation and Entrepreneurship Support Program Project of Anhui Province(2021LCX022)
Key R&D Projects in Anhui Province(2022i01020012)
Natural Science Foundation of Hefei(2022039)
Excellent Research and Innovation Team Project of Anhui Province(2022AH010001)
出版年
2024
NETL
NSTL
万方数据