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Branched polyethylenes attainable using thermally enhanced bis(imino) acenaphthene-nickel catalysts: Exploring the effects of temperature and pressure
Zhang, QY; Zhang, RD; Ma, YP; Solan, GA; Liang, TL; Sun, WH
2019-03-05
Source PublicationAPPLIED CATALYSIS A-GENERAL
ISSN0926-860X
Volume573Pages:73-86
AbstractThe 4,4'-difluorobenzhydryl-containing nickel(II) bromide and chloride chelates, [142,6-{(4-F-C6H4)(2)CH}(2)-4{C(CH3)(3)}-C6H2N]-2-(ArN)C2C30H6)NiX2 (X = Br: Ar = 2,6-Me2C6H3 Nil, 2,6-Et2C6H3 Ni2, 2,6-i-Pr2C6H3 Ni-3, 2,4,6-Me3C6H2 Ni4, 2,6-Et2-4-MeC6H2 Ni-5 and X = Cl: Ar = 2,6-Me2C6H3 Ni6, 2,6-Et2C6H3 Ni7, 2,6-i-Pr2C6H3 Ni8, 2,4,6-Me3C6H2 Ni9, 2,6-Et2-4-MeC6H2 Ni10), have been prepared and fully characterized. The solid-state structures of representative Ni3 and Ni7 display distorted tetrahedral geometries which are maintained in solution with broad paramagnetically shifted resonances a feature of all the 1H and 19F NMR spectra; the effect the halide (Br/Cl) ligand has on the proton and fluorine chemical shifts presents a further point of interest. All ten nickel complexes displayed, on activation with either MAO (methylaluminoxane) or EASC (ethyl aluminum sesquichloride), very high activities (up to 1.36 x 10(7) g PE mol(-1) (Ni) h(-1)) for ethylene polymerization at either 1 or 10 atm C2H4 with the structural features of the N,N'-ligand influential. Significantly, with EASC as co catalyst, Ni5 was capable of operating effectively at 90 degrees C without comprising too much catalytic activity [ca. 4.34 x 106 g PE mol(-1) (Ni) h(-1)]. All the polyethylenes are highly branched with the branching content and type of branch strongly affected by a combination of temperature, pressure and the class of co-catalyst employed. Moreover, good tensile strength (et, up to 2839.5%) and elastic recovery (up to 74%) have been displayed, properties that are characteristic of thermoplastic elastomers (TPEs).
KeywordNickel catalysts Branched polyethylene Temperature and pressure effects 4,4'-Difluorobenzhydryl groups 1,2-Bis(arylimino)acenaphthene
MOST Discipline CatalogueChemistry ; Environmental Sciences & Ecology
DOI10.1016/j.apcata.2019.01.016
Indexed BySCI
Language英语
WOS SubjectChemistry ; Physical ; Environmental Sciences
WOS IDWOS:000458938700009
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41951
Collection工程塑料实验室
Affiliation1.Solan, GA
2.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China.
3.Solan, GA
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
Zhang, QY,Zhang, RD,Ma, YP,et al. Branched polyethylenes attainable using thermally enhanced bis(imino) acenaphthene-nickel catalysts: Exploring the effects of temperature and pressure[J]. APPLIED CATALYSIS A-GENERAL,2019,573:73-86.
APA Zhang, QY,Zhang, RD,Ma, YP,Solan, GA,Liang, TL,&Sun, WH.(2019).Branched polyethylenes attainable using thermally enhanced bis(imino) acenaphthene-nickel catalysts: Exploring the effects of temperature and pressure.APPLIED CATALYSIS A-GENERAL,573,73-86.
MLA Zhang, QY,et al."Branched polyethylenes attainable using thermally enhanced bis(imino) acenaphthene-nickel catalysts: Exploring the effects of temperature and pressure".APPLIED CATALYSIS A-GENERAL 573(2019):73-86.
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