Chemical recycling of polyolefins <i>via</i> ring-closing metathesis depolymerization

Ibrahim, Tarek; Ritacco, Angelo; Nalley, Daniel; Emon, Omar Faruk; Liang, Yifei; Sun, Hao

doi:10.1039/d3cc05612k

Chem. Commun.

2024

DOI: 10.1039/d3cc05612k

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Chemical recycling of polyolefins via ring-closing metathesis depolymerization

Tarek Ibrahim,

Angelo Ritacco,

Daniel Nalley

et al.

Abstract: The current insufficient recycling of commodity polymer wastes has resulted in pressing environmental and human health issues in our modern society. In the quest for next-generation polymer materials, chemists have...

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2024

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Cited by 5 publications

References 62 publications

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Sustainable poly(imide‐imide) vitrimer based on multiple dynamic covalent bonds

Zhao,

Zhang,

Bai

et al. 2024

J of Applied Polymer Sci

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Polyimide materials with high mechanical strength are widely used in various fields, but pose certain challenges in achieving sustainable material utilization. A poly(imide‐imide) vitrimer material (ADTA) based on multiple dynamic covalent bonds (imide, imine, and disulfide bonds) was constructed by preparing vanillin difunctionalized derivatives (DVA) for aldolamine condensation reactions with bis‐amine monomers (ATFA) and tris(2‐aminoethyl) amines (TAEA) with imide structures. The ADTA material has good 5% thermal stability Td5% (278.87°C), high energy storage modulus E (2421.26 MPa), and fast relaxation time (36.39 s). The thermal stability and mechanical properties of the material are enhanced by the more stable alicyclic structure of the imide structure. The material also demonstrated excellent solvent resistance and self‐healing properties. This study provides a new option for the development of sustainable utilization of polyimide materials.

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Sustainable poly(imide‐imide) vitrimer based on multiple dynamic covalent bonds

Zhao,

Zhang,

Bai

et al. 2024

J of Applied Polymer Sci

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Polyheptenamer: A chemically recyclable polyolefin enabled by the low strain of seven‐membered cycloheptene

Ibrahim,

Martindale,

Ritacco

et al. 2024

Journal of Polymer Science

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Low‐strain cyclic olefin monomers, including five‐membered, six‐membered, eight‐membered, and macrocyclic rings, have been recently exploited for the synthesis of depolymerizable polyolefins via ring‐opening metathesis polymerization (ROMP). Such polyolefins can undergo ring‐closing metathesis depolymerization (RCMD) to regenerate their original monomers. Nevertheless, the depolymerization behavior of polyolefins prepared by ROMP of seven‐membered cyclic olefins, an important class of low‐strain rings, still remains unexplored. In this study, we demonstrate the chemical recycling of polyheptenamers to cycloheptene under standard RCMD conditions. Highly efficient depolymerization of polyheptenamer was enabled by Grubbs' second‐generation catalyst in toluene. It was observed that the monomer yields increased when the depolymerization temperature increased and the starting polymer concentration was reduced. A near‐quantitative monomer regeneration (>96%) was achieved within 1 h under dilute conditions (20 mM of olefins) at 60°C. Moreover, polyheptenamer exhibited a decomposition temperature above 430°C, highlighting its potential as a new class of thermally stable and chemically recyclable polymer materials.

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Chemically recyclable rosin-based polymers

Sha,

Chen,

Sun

et al. 2024

European Polymer Journal

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Chemical recycling of polyolefins via ring-closing metathesis depolymerization

Abstract: The current insufficient recycling of commodity polymer wastes has resulted in pressing environmental and human health issues in our modern society. In the quest for next-generation polymer materials, chemists have...

Cited by 5 publications

References 62 publications

Sustainable poly(imide‐imide) vitrimer based on multiple dynamic covalent bonds

Sustainable poly(imide‐imide) vitrimer based on multiple dynamic covalent bonds

Polyheptenamer: A chemically recyclable polyolefin enabled by the low strain of seven‐membered cycloheptene

Chemically recyclable rosin-based polymers

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