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- W1978829998 abstract "A new series of iron catalysts bearing tridentate pyridine−bis(imine) ligands are reported for the isospecific polymerization of propylene (PP). The catalytic activities are moderate, with maximum activities exceeding 1600 kg PP/mol Fe h under 1 atm of propylene pressure at −20 °C . End-group analyses of the resultant materials are performed and indicate that the polymerization proceeds via a 2,1 mechanism of propagation leading to the exclusive formation of 1-propenyl end groups following β-H elimination/abstraction and chain transfer. The polymers are highly regioregular, but the regioregularity decreases with decreasing steric bulk of the tridentate ligands. Isotacticities are determined for a number of catalysts bearing ligands with variable ortho substituent patterns and symmetries. In all cases, isotactic material is obtained; the [m]4 methyl pentad content is always in the range of 55−67%. 13C NMR spectroscopy is used to demonstrate that the isotacticity arises from a chain-end control mechanism. These catalysts represent the first isospecific systems known to operate by a 2,1 mechanism of propagation." @default.
- W1978829998 created "2016-06-24" @default.
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- W1978829998 date "1999-03-12" @default.
- W1978829998 modified "2023-10-16" @default.
- W1978829998 title "Polymerization of Propylene by a New Generation of Iron Catalysts: Mechanisms of Chain Initiation, Propagation, and Termination" @default.
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- W1978829998 doi "https://doi.org/10.1021/ma981698s" @default.
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