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Published on: April 22, 2016
New phenoxyketimine titanium complexes: combining isotacticity and living behavior in propylene polymerization
Andrew F Mason1, Geoffrey W Coates
1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA.
Abstract:
A series of titanium bis(phenoxyketimine) olefin polymerization catalysts were synthesized and screened for propylene polymerization. The phenoxyketimine ligands contain pentafluorophenyl N-aryl groups and ortho-phenol substituents of varying size. Catalysts with ortho-phenol substituents of intermediate size produce living, substantially isotactic polypropylene. The living nature of these catalyst systems is demonstrated through the synthesis of block copolymers with narrow molecular weight distributions.
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