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Nitro-functionalized bis(imino)pyridylferrous chlorides as thermo-stable precatalysts for linear polyethylenes with high molecular weights
Mahmood, Q; Yue, E; Guo, JJ; Zhang, WJ; Ma, YP; Hao, X; Sun, WH
2018-12-20
Source PublicationPOLYMER
ISSN0032-3861
Volume159Pages:124-137
AbstractElectronically and sterically enhanced Fe (II) chloride complexes (Fe1 - Fe6) bearing 2-(1-(2,6-dibenzhydryl-4-nitrophenylimino)ethyl)-6-(1-(arylimino)ethyl)pyridine (aryl = 2,6-Me2Ph L1, 2,6-Et2Ph L2, 2,6-(Pr2Ph)-Pr-i L3, 2,4,6-Me3Ph L4 and 2,6-Et-2-4-MePh L5) and 2,6-bis(1-(2,6-dibenzhydryl-4-nitrophenylimino)ethyl)pyridine (L6) ligands have been prepared. In addition to the elemental and spectroscopic analysis of all new compounds; the molecular structures of Fe1, Fe2 and Fe6 have been subject of the X-ray diffraction. The catalytic potential of all the complexes was investigated for ethylene polymerization and compared with the results of prototypal precatalyst, 2,6-bis(1-(2,6-diisopropylphenylimino)ethyl)pyridyliron chloride (Fe0). On treatment with MAO and MMAO co-catalysts, Fe6 was essentially inactive, while the iron complexes (Fe1 - Fe5) displayed exceptionally high activities as high as 2.53 x 10(7) g(PE) (mol of Fe)(-1)h(-1 )at 50 degrees C and 3.86 x 10(6) g(PE) (mol of Fe)(-1) h(-1) at 100 degrees C, and afforded high molecular weight polyethylene up to 610.6 kg/mol. By comparing with catalytic performance of the reported bis(imino)pyridine-iron precatalysts bearing non-nitro para-substituents (CH3, Cl) including Fe0, these values of activity and molecular weight are found to be the highest reported up to date. Additionally, the resultant polyethylenes are characteristically linear as being confirmed by DSC (T-m = 125.3-135.6 degrees C) and high-temperature C-13 NMR measurments.
KeywordIron precatalyst Ethylene polymerization Linear polyethylene with high molecular-weight
MOST Discipline CataloguePolymer Science
DOI10.1016/j.polymer.2018.11.016
Indexed BySCI
Language英语
WOS SubjectPolymer Science
WOS IDWOS:000451818000015
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41959
Collection工程塑料实验室
Affiliation1.Zhang, WJ
2.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China.
3.Zhang, WJ
4.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Mahmood, Q,Yue, E,Guo, JJ,et al. Nitro-functionalized bis(imino)pyridylferrous chlorides as thermo-stable precatalysts for linear polyethylenes with high molecular weights[J]. POLYMER,2018,159:124-137.
APA Mahmood, Q.,Yue, E.,Guo, JJ.,Zhang, WJ.,Ma, YP.,...&Sun, WH.(2018).Nitro-functionalized bis(imino)pyridylferrous chlorides as thermo-stable precatalysts for linear polyethylenes with high molecular weights.POLYMER,159,124-137.
MLA Mahmood, Q,et al."Nitro-functionalized bis(imino)pyridylferrous chlorides as thermo-stable precatalysts for linear polyethylenes with high molecular weights".POLYMER 159(2018):124-137.
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