Journal
ACS CENTRAL SCIENCE
Volume 6, Issue 6, Pages 921-927Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.0c00083
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Funding
- National Science Foundation (NSF) through the Center for Sustainable Polymers [CHE-1413862]
- MRSEC Program of the Materials Research Center at Northwestern University [NSF DMR-1121262]
- Integrated Molecular Structure Education and Research Center at Northwestern University
- Soft and Hybrid Nanotechnology Experimental Resource [NSF NNCI-1542205]
- State of Illinois
- International Institute for Nanotechnology
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- Keck Foundation
- State of Illinois, through the IIN
- International Institute for Nanotechnology (IIN)
- MRSEC program at the Materials Research Center [NSF DMR1720139]
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Cross-linked polyurethane (PU) is extensively used as thermoset foam; however, methods to directly reprocess PU foam waste derived from commercial sources into similar value materials have not been developed. We demonstrate that introducing dibutyltin dilaurate (DBTDL) into cross-linked PU foams and films enables their reprocessing at elevated temperatures via dynamic carbamate exchange reactions. Both model and commercial cross-linked PU foams were continuously reprocessed using twin-screw extrusion to remove gaseous filler and produce PU filaments or films with elastomeric or rigid thermoset mechanical properties. The properties of microcompounded model PU foam were in excellent agreement with PU film synthesized using the same monomers, indicating that this process occurs efficiently. These findings will enable the bulk reprocessing of commercial thermoset PU waste and inspire the further development of reprocessing methods for other thermosets and the compatibilization of chemically distinct cross-linked materials.
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