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- Title
Precision Chain-Walking Polymerization of trans-4-Octene Catalyzed by α-Diimine Nickel(II) Catalysts Bearing ortho-sec-Phenethyl Groups.
- Authors
Wang, Fuzhou; Tanaka, Ryo; Cai, Zhengguo; Nakayama, Yuushou; Shiono, Takeshi
- Abstract
α-Diimine nickel complexes bearing bulky ortho-sec-phenethyl groups (bis{[ N, N′ -(4 -methyl -2,6 -di -sec-phenethylphenyl)imino] -1,2 -dimethylethane}dibromonickel ( 1), bis{[ N, N′ -(4,6 -dimethyl -2 -sec-phenethylphenyl)imino] -1,2 -dimethylethane}dibromonickel ( 2), bis{[ N, N′ -(4 -methyl -2 -sec-phenethylphenyl)imino] -1,2 -dimethylethane}dibromonickel ( 3)) and {bis[ N, N′ -(2,4,6 -trimethylphenyl)imino] -1,2 -dimethylethane}dibromidonickel ( 4) are used as a precatalyst for the polymerization of trans-4 -octene upon activation with modified methylaluminoxane. These catalysts conduct chain -walking polymerization of trans-4 -octene to give polymers possessing propyl and butyl branches with high molecular weight and narrow molecular weight distribution. The branching structure depends on the nickel complex as well as the polymerization temperature, and the ratio of propyl branch was increased with increasing the bulkiness of the ligand and decreasing the polymerization temperature. Consequently, the most bulky 1 among the complexes used is found to polymerize trans-4 -octene with high 1,5 -regioselectivity at −20 °C to give poly(1 -propylpentan -1,5 -diyl).
- Subjects
NICKEL catalysts; POLYMERIZATION; OCTENE; IMINES; MOLECULAR weights
- Publication
Macromolecular Rapid Communications, 2016, Vol 37, Issue 16, p1375
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201600203