Conversion of waste poly(vinyl chloride) to branched polyethylene mediated by silylium ions

Wood, Zachary A.; Castro, Eunice C.; Nguyen, Angelyn N.; Fieser, Megan E.

doi:10.1039/d4sc00130c

Chem. Sci.

2024

DOI: 10.1039/d4sc00130c

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Conversion of waste poly(vinyl chloride) to branched polyethylene mediated by silylium ions

Zachary A. Wood,

Eunice C. Castro,

Angelyn N. Nguyen

et al.

Abstract: Lewis acidic silylium ions are used to completely remove Cl from poly(vinyl chloride) (PVC) in clean and commercial products through hydrodechlorination. Reaction conditions were found to impact the branching in the resulting polyethylene (PE).

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Cited by 2 publications

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Poly(vinyl chloride) (PVC): an updated review of its properties, polymerization, modification, recycling, and applications

Edo,

Ndudi,

Ali

et al. 2024

J Mater Sci

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Poly(vinyl chloride) (PVC): an updated review of its properties, polymerization, modification, recycling, and applications

Edo,

Ndudi,

Ali

et al. 2024

J Mater Sci

View full text Add to dashboard Cite

Catalytic Upcycling of Polyolefins

Sun,

Dong,

Gao

et al. 2024

Chem. Rev.

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The large production volumes of commodity polyolefins (specifically, polyethylene, polypropylene, polystyrene, and poly(vinyl chloride)), in conjunction with their low unit values and multitude of short-term uses, have resulted in a significant and pressing waste management challenge. Only a small fraction of these polyolefins is currently mechanically recycled, with the rest being incinerated, accumulating in landfills, or leaking into the natural environment. Since polyolefins are energy-rich materials, there is considerable interest in recouping some of their chemical value while simultaneously motivating more responsible end-of-life management. An emerging strategy is catalytic depolymerization, in which a portion of the C−C bonds in the polyolefin backbone is broken with the assistance of a catalyst and, in some cases, additional small molecule reagents. When the products are small molecules or materials with higher value in their own right, or as chemical feedstocks, the process is called upcycling. This review summarizes recent progress for four major catalytic upcycling strategies: hydrogenolysis, (hydro)cracking, tandem processes involving metathesis, and selective oxidation. Key considerations include macromolecular reaction mechanisms relative to small molecule mechanisms, catalyst design for macromolecular transformations, and the effect of process conditions on product selectivity. Metrics for describing polyolefin upcycling are critically evaluated, and an outlook for future advances is described.

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Conversion of waste poly(vinyl chloride) to branched polyethylene mediated by silylium ions

Abstract: Lewis acidic silylium ions are used to completely remove Cl from poly(vinyl chloride) (PVC) in clean and commercial products through hydrodechlorination. Reaction conditions were found to impact the branching in the resulting polyethylene (PE).

Cited by 2 publications

References 57 publications

Poly(vinyl chloride) (PVC): an updated review of its properties, polymerization, modification, recycling, and applications

Poly(vinyl chloride) (PVC): an updated review of its properties, polymerization, modification, recycling, and applications

Catalytic Upcycling of Polyolefins

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