Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst | |
Department | OSSO国家重点实验室 |
Qaiser Mahmood1,2; Zeng, Yanning1; Yue, Erlin1; Gregory A. Solan1,3; Liang, Tongling1; Sun WH(孙文华)1,2,4; Sun WH(孙文华) | |
2017 | |
Source Publication | Polymer Chemistry |
ISSN | 1759-9954 |
Volume | 8Issue:41Pages:6416-6430 |
Abstract | A collection of ten related 1,2-bis(imino)acenaphthene-nickel(II) halide complexes, [1-[2,6-{(C6H5)2CH}2-4-{C(CH3)3}-C6H2N]-2-(ArN)C2C10H6]NiX2 (X = Br: Ar = 2,6-Me2C6H3Ni1, 2,6-Et2C6H3Ni2, 2,6-iPr2C6H3Ni3, 2,4,6-Me3C6H2Ni4, 2,6-Et2-4-MeC6H2Ni5) and (X = Cl: Ar = 2,6-Me2C6H3Ni6, 2,6-Et2C6H3Ni7, 2,6-iPr2C6H3Ni8, 2,4,6-Me3C6H2Ni9, 2,6-Et2-4-MeC6H2Ni10), each bearing one sterically and electronically enhanced N-2,6-dibenzhydryl-4-t-butylphenyl group, have been prepared and fully characterized. The unsymmetrical nature of the chelating bis(imino)acenaphthene is confirmed in the paramagnetic 1H NMR spectra for Ni1–Ni10, while the molecular structures of Ni1, Ni2 and Ni6 highlight the unequal steric protection of the nickel center imposed by their respective N,N-ligands. On activation with either Et2AlCl or MMAO, all the nickel complexes were highly active catalysts in ethylene polymerization [as high as 1.26 × 107 g of PE per mol of Ni per h] affording exceptionally high molecular weight (up to 3.1 × 106 g mol−1) hyper-branched polyethylene. Analysis of the mechanical properties reveals the ultra-high molecular weight polymers possess high tensile strength, excellent shape fixity and elastic recovery (up to 69%) as well as high elongation at break (εb = 843.9%); such materials offer a promising alternative to current thermoplastic elastomers (TPEs). |
Subject Area | 物理化学与绿色催化 |
DOI | 10.1039/c7py01606a |
Funding Organization | the National Natural Science Foundation of China (no. 21374123;U1362204);the National Key Research and Development Program of China (2016YFB1100800);QM is grateful to the CAS-TWAS president’s fellowship;GAS thanks the Chinese Academy of Sciences for a Visiting Fellowship |
Indexed By | SCI |
If | 5.375 |
Language | 英语 |
compositor | 第四作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/22531 |
Collection | 羰基合成与选择氧化国家重点实验室(OSSO) |
Corresponding Author | Gregory A. Solan; Sun WH(孙文华) |
Affiliation | 1.Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China 2.CAS Research/Education Center for Excellence in Molecular Sciences and International School, University of Chinese Academy of Sciences, Beijing 100049, China 3.Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK 4.State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
Recommended Citation GB/T 7714 | Qaiser Mahmood,Zeng, Yanning,Yue, Erlin,et al. Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst[J]. Polymer Chemistry,2017,8(41):6416-6430. |
APA | Qaiser Mahmood.,Zeng, Yanning.,Yue, Erlin.,Gregory A. Solan.,Liang, Tongling.,...&孙文华.(2017).Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst.Polymer Chemistry,8(41),6416-6430. |
MLA | Qaiser Mahmood,et al."Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst".Polymer Chemistry 8.41(2017):6416-6430. |
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