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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
Published on: December 16, 2022
Insertion Homo- and Copolymerization of Diallyl Ether.
Zhongbao Jian1, Stefan Mecking2
1Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz (Germany).
Palladium-catalyzed polymerization of diallyl ether overcomes previous limitations, enabling selective cyclic ether formation and high incorporation into ethylene polymers. This breakthrough allows for the synthesis of poly-diallyl ether with significant polymerization degrees.
Area of Science:
- Polymer Chemistry
- Organometallic Chemistry
Background:
- Allyl monomers (CH2=CHCH2X) present polymerization challenges due to side reactions.
- Previous methods struggled with controlled polymerization of diallyl compounds.
Purpose of the Study:
- To develop a novel method for the polymerization of diallyl ether.
- To investigate the mechanism and outcomes of palladium-catalyzed insertion polymerization.
- To explore the incorporation of diallyl ether into ethylene polymers.
Main Methods:
- Palladium-catalyzed insertion polymerization using diallyl ether as the monomer.
- Analysis of monomer insertion regioselectivity (2,1-insertion vs. 1,2-insertion).
- Copolymerization with ethylene and homopolymerization studies.
Main Results:
- Achieved selective formation of cyclic ether repeat units (96%-99%) via intramolecular insertion.
- Demonstrated enhanced incorporation of diallyl ether into ethylene polymers (20.4 mol%).
- Successfully synthesized poly-diallyl ether homopolymers with a degree of polymerization (DPn) of approximately 44.
Conclusions:
- Palladium-catalyzed insertion polymerization offers a viable route for diallyl ether polymerization.
- The 2,1-insertion mechanism effectively prevents undesired cyclization and promotes polymer growth.
- This method opens new possibilities for creating novel polymers and functionalized polyolefins.
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