Issue 64, 2016, Issue in Progress

Efficient copolymerization of ethylene with norbornene or its derivatives using half-metallocene zirconium(iv) catalysts

Abstract

A series of half-metallocene zirconium complexes CpZr(thf)Cl2[O-2,4-tBu-6-(P-PhR)C6H2] (Cp = C5H5, 2a: R = Me, 2b: R = tBu, 2c: R = Ph, 2d: R = 4-F-Ph) have been synthesized by reacting CpZrCl3 with the corresponding ligands in THF. All the complexes were characterized by (1H, 13C and 31P) NMR spectroscopy as well as elemental analysis. X-ray structural analysis for 2a and 2d revealed a six-coordinate distorted octahedral geometry around the zirconium center in the solid state. With the activation of a suitable cocatalyst, half-metallocene zirconium complexes 2a–d were employed to catalyze ethylene polymerization and ethylene copolymerization with cycloolefins including norbornene (NBE), 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB). All the complexes exhibited high efficiency toward the copolymerizations. High comonomer incorporations up to 62% (NBE), 76% (ENB) and 40.6% (VNB), respectively, with high catalytic activities above 103 kgpolymer per molZr per h were achieved using catalyst 2c. Steric hindrance and electronic effects of the complexes or the comonomers greatly influence copolymerization behavior. Thus, catalytic activity and copolymer chain structure, including comonomer incorporation and the molecular weight, can be easily tuned over a wide range by changing catalyst and reaction conditions.

Graphical abstract: Efficient copolymerization of ethylene with norbornene or its derivatives using half-metallocene zirconium(iv) catalysts

Supplementary files

Article information

Article type
Paper
Submitted
04 May 2016
Accepted
15 Jun 2016
First published
15 Jun 2016

RSC Adv., 2016,6, 59590-59599

Efficient copolymerization of ethylene with norbornene or its derivatives using half-metallocene zirconium(IV) catalysts

Y. Li, J. Yang, B. Wang and Y. Li, RSC Adv., 2016, 6, 59590 DOI: 10.1039/C6RA11501B

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