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Remote dibenzocycloheptyl-substitution of an iminotrihydroquinoline-nickel catalyst as a route to narrowly dispersed branched polyethylene waxes with alkene functionality
Guo, LW; Zhu, DZ; Zhang, WJ; Zada, M; Solan, GA; Hao, X; Sun, WH
2018-10-01
Source PublicationEUROPEAN POLYMER JOURNAL
ISSN0014-3057
Volume107Pages:315-328
AbstractThe 8-(arylimino)-5,6,7-trihydroquinoline-nickel(II) chlorides, [8-N(2,6-R-2-4-(C15H13)C6H2}C9H8N]NiCl2 (R = Me Nil, Et Ni2, i-Pr Ni3, F Ni4, Cl Ni5), each appended with a remote para-dibenzocycloheptyl group, have been synthesized from either the pre-formed ligand (Nil-Ni3) or by generating the ligand in-situ during complexation (Ni4, Ni5). The molecular structures of Ni2 and Ni3 adopt dimeric or trimeric forms in the solid state, in which the chlorides can act as doubly or triply bridging ligands. On treatment with either MMAO or Et2AlCl:, Nil-Ni5 showed low (Ni4, Ni5) to high activities (Nil-Ni3: up to 4.58 x 10(6) g PE mol(-1) (Ni) h(-1)) for ethylene polymerization producing unsaturated polyethylenes of low molecular weight (1.4-2.7 kg center dot mol(-1)) and narrow dispersity ( < 2.0). In the main, these polyethylene waxes are highly branched and contain relatively high levels of internal vinylenes (-CH=CH-) with respect to terminal vinyls (-CH=CH2). The ortho-substituents of the precatalyst were found to not only affect the catalytic activity but also the vinylene:vinyl ratio and the branching content. Notably, the materials generated using ortho-fluoro Ni4/Et2AlCl possessed the least number of branches and an increased vinyl contribution. Furthermore, these unsaturated polyethylenes can be readily functionalized by epoxidation with almost quantitative conversion.
KeywordNickel complex Ethylene polymerization Unsaturated polyethylene waxes Epoxidation
MOST Discipline CataloguePolymer Science
DOI10.1016/j.eurpolymj.2018.09.007
Indexed BySCI
Language英语
WOS SubjectPolymer Science
WOS IDWOS:000450376300034
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/41962
Collection工程塑料实验室
Affiliation1.Zhang, WJ
2.Solan, GA
3.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China.
4.Zhang, WJ
5.Solan, GA
6.Sun, WH (reprint author), Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Guo, LW,Zhu, DZ,Zhang, WJ,et al. Remote dibenzocycloheptyl-substitution of an iminotrihydroquinoline-nickel catalyst as a route to narrowly dispersed branched polyethylene waxes with alkene functionality[J]. EUROPEAN POLYMER JOURNAL,2018,107:315-328.
APA Guo, LW.,Zhu, DZ.,Zhang, WJ.,Zada, M.,Solan, GA.,...&Sun, WH.(2018).Remote dibenzocycloheptyl-substitution of an iminotrihydroquinoline-nickel catalyst as a route to narrowly dispersed branched polyethylene waxes with alkene functionality.EUROPEAN POLYMER JOURNAL,107,315-328.
MLA Guo, LW,et al."Remote dibenzocycloheptyl-substitution of an iminotrihydroquinoline-nickel catalyst as a route to narrowly dispersed branched polyethylene waxes with alkene functionality".EUROPEAN POLYMER JOURNAL 107(2018):315-328.
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