Copolymerization of Ethylene and Long-Chain Functional α-Olefins by Dinuclear Zirconium Catalysts
Abstract
Bimetallic catalysts have shown promise for improving polar comonomer incorporation by late transition metals, but such effects are underexplored using early transition metal catalysts. Herein, the copolymerization of ethylene and α-olefins bearing alcohol groups was performed using mono- and dizirconium bisamine bisphenolate catalysts in the presence of MAO and Al^iBu₃. Under these conditions, catalyst activity was retained with comonomer incorporation trends mirroring those observed with unfunctionalized α-olefins, i.e., lower incorporation by bimetallic catalysts. Although incorporation levels are low, these data provide mechanistic insight for polar comonomer incorporation. These results are consistent with our earlier proposal that larger comonomers sterically clash with the distal metal center of the bimetallic catalysts, leading to lower incorporation. Additionally, a bimetallic mechanism for polar comonomer coordination and incorporation is not supported by the current data.
Additional Information
© 2021 American Chemical Society. Received: March 2, 2021; Published: June 7, 2021. The authors are grateful for the support provided by the King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, offered under the KFUPM-Caltech Research Collaboration. The authors are also grateful for the assistance of Dr. Dave VanderVelde in acquiring polymer NMR data. The authors declare no competing financial interest.Attached Files
Supplemental Material - om1c00126_si_001.pdf
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Additional details
- Eprint ID
- 109548
- Resolver ID
- CaltechAUTHORS:20210623-151211923
- King Fahd University of Petroleum and Minerals (KFUPM)
- Created
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2021-06-23Created from EPrint's datestamp field
- Updated
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2021-07-06Created from EPrint's last_modified field