期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 28, 页码 12613-12618出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c04499
关键词
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资金
- Ames Laboratory
- U.S. Department of Energy (DOE) , O ffi ce of Science, O ffi ce of Basic Energy Sciences [DMR-1719875]
- Energy Frontier Research Center
- NSF [DE-AC02-07CH11358, CHE-1531632]
This study demonstrates a new catalyst for isoselective copolymerization of propylene and butadiene, which enables chemical recycling of polyolefins while maintaining good molecular weights and turnover frequencies.
Polyolefins represent the largest class of commodity materials due to their excellent material properties; however, they have limited pathways to chemical recycling and are often difficult to mechanically recycle. Here we demonstrate a new catalyst for the isoselective copolymerization of propylene and butadiene capable of favoring 1,4-insertion over 1,2-insertion while maintaining good molecular weights and turnover frequencies. This isotactic propylene copolymer with main-chain unsaturation was depolymerized to a telechelic macromonomer using an olefin metathesis catalyst and 2-hydroxyethyl acrylate. After hydrogenation, the telechelic macromonomer was repolymerized to form an ester-linked polypropylene material. This polymer shows thermal and mechanical properties comparable to linear low-density polyethylene. Finally, the telechelic macromonomer could be regenerated through the depolymerization of the ester-linked polypropylene material, which allows for the chemical recycling to macromonomer. This process provides a route to transform partially unsaturated polyolefins to chemically recyclable materials with similar properties to their parent polymers.
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