| Autor: |
Alejandra Arroyave, Shilin Cui, Jaqueline C. Lopez, Andrew L. Kocen, Anne M. LaPointe, Massimiliano Delferro, Geoffrey W. Coates |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Journal of the American Chemical Society. 144(51) |
| ISSN: |
1520-5126 |
| Popis: |
Among commercial plastics, polyolefins are the most widely produced worldwide but have limited recyclability. Here, we report a chemical recycling route for the conversion of post-consumer high-density polyethylene (HDPE) into telechelic macromonomers suitable for circular reprocessing. Unsaturation was introduced into HDPE by catalytic dehydrogenation using an Ir-POCOP catalyst without an alkene acceptor. Cross-metathesis with 2-hydroxyethyl acrylate followed by hydrogenation transformed the partially unsaturated HDPE into telechelic macromonomers. The direct repolymerization of the macromonomers gave a brittle material due to the low overall weight-average molecular weight. Aminolysis of telechelic macromonomers with a small amount of diethanolamine increased the overall functionality. The resulting macromonomers were repolymerized through transesterification to generate a polymer with comparable mechanical properties to the starting post-consumer HDPE waste. Depolymerization of the repolymerized material catalyzed by an organic base regenerated the telechelic macromonomers, thereby allowing waste polyethylene materials to enter a chemical recycling pathway. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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