6533b85dfe1ef96bd12bde8a
RESEARCH PRODUCT
Finely tuned nickel complexes as highly active catalysts affording branched polyethylene of high molecular weight: 1-(2,6-Dibenzhydryl-4- methoxyphenylimino)-2-(arylimino)acenaphthylenenickel halides
Cun-yue GuoYang SunRuikai WuRandi ZhangWen-hua SunYifan WangZygmunt FlisakZygmunt Flisaksubject
Polymers and Plastics010405 organic chemistryOrganic Chemistrychemistry.chemical_elementHalideTetrahedral molecular geometrythermoplastic elastomerPolyethylenebranched polyethylene010402 general chemistryethylene polymerization01 natural sciences0104 chemical sciencesCatalysisNickelchemistry.chemical_compoundchemistryUltimate tensile strengthPolymer chemistryMaterials ChemistryProton NMRElongationdescription
Abstract A series of unsymmetrical 1,2-bis(imino)acenaphthenenickel(II) halides containing N-2,6-dibenzhydryl-4-methoxyphenyl – a single bulky group with adjusted electron donating properties – has been synthesized and characterized. These compounds adopt distorted tetrahedral geometry and their 1H NMR spectra show the paramagnetically shifted peaks. On activation with a low amount of Et2AlCl or ethylaluminum sesquichloride (EASC), these nickel complexes display high activity in ethylene polymerization, yielding the polyethylene of high molecular weight. They are also stable at elevated temperature; superb activity of 2.51 × 106 g of PE (mol of Ni)−1 h−1 can be attained at 90 °C. The resultant polyethylene exhibits remarkable tensile strength of 24.5 MPa and high elongation at break (602.2%) as well as substantial elastic recovery.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-09-01 | Polymer |