Integration of upcycling and closed-loop recycling through alternative cyclization–depolymerization

Tian, Guangjin; Yang, Zheng-He; Zhang, Wei; Chen, Si-Chong; Chen, Li; Wu, Gang; Wang, Yu‐Zhong

doi:10.1039/d2gc00853j

Cited by 23 publications

(21 citation statements)

References 50 publications

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“…The resulting PMDO can be completely depolymerized by simple pyrolysis to recover the MDO. In 2022, wang et al [90] . used Brønsted acidic ionic liquid as a solvent/catalyst bifunctional agent to achieve linear PPDO ( l ‐PPDO) depolymerization and cyclization at a low temperature.…”

Section: Chemically Recyclable Polyestersmentioning

confidence: 99%

Advances in the Synthesis of Chemically Recyclable Polymers

et al. 2023

Chemistry An Asian Journal

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The development of modern society is closely related to polymer materials. However, the accumulation of polymer materials and their evolution in the environment causes not only serious environmental problems, but also waste of resources. Although physical processing can be used to reuse polymers, the properties of the resulting polymers are significantly degraded. Chemically recyclable polymers, a type of polymer that degrades into monomers, can be an effective solution to the degradation of polymer properties caused by physical recycling of polymers. The ideal chemical recycling of polymers, i. e., quantitative conversion of the polymer to monomers at low energy consumption and repolymerization of the formed monomers into polymers with comparable properties to the original, is an attractive research goal. In recent years, significant progress has been made in the design of recyclable polymers, enabling the regulation of the "polymerization-depolymerization" equilibrium and closed-loop recycling under mild conditions. This review will focus on the following aspects of closed-loop recycling of poly(sulfur) esters, polycarbonates, polyacetals, polyolefins, and poly(disulfide) polymer, illustrate the challenges in this area, and provide an outlook on future directions.

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Section: Chemically Recyclable Polyestersmentioning

confidence: 99%

Advances in the Synthesis of Chemically Recyclable Polymers

et al. 2023

Chemistry An Asian Journal

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“…1–3 Extensive research focused on chemical recycling of polymers to monomers (CRM) has been devoted to enabling a circular plastics economy and sustainable development. 4–35 In a pioneering work, poly (γ-butyrolactone) from the ring-opening polymerization (ROP) of “non-polymerizable” butyrolactone was discovered to quantitatively depolymerize into its monomer γ-butyrolactone upon being heated at 220–300 °C for one hour, 4,36 manifesting the potential of its chemical recycling in the circular plastics economy and promoting the development of this field. However, most of the currently studied polymer systems have involved aliphatic polyesters 37–48 and chemically recyclable aromatic polyesters have been less extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

Leveraging the monomer structure for high-performance chemically recyclable semiaromatic polyesters

Fan

Xing

et al. 2023

Polym. Chem.

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“…Among them, O -heterocyclic lactones are promising candidates to prepare closed-loop recyclable polyesters. The ROPs of 1,4-dioxan-2-one, 2,3-dihydro-5 H -1,4-benzodioxepin-5-one, and their derivatives have been reported to produce closed-loop recyclable polyesters. , For example, Zhu’s group reported that a class of aromatic cyclic ester monomers can be prepared from thiosalicylic acid and epoxides by a facile one-pot synthetic strategy . ROP of these monomers can afford aromatic–aliphatic polyesters with high molecular weights and narrow dispersities.…”

Section: Introductionmentioning

confidence: 99%

Crystalline Stereoregular Poly(ether-ester) via MeAl[Salen]-Catalyzed Well-Controlled Ring-Opening Polymerization of Enantiopure Cyclic Ether-Ester Monomer

Zhao

Shen

et al. 2023

Macromolecules

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The development of chemically recyclable polymers with closed-loop life cycles is believed to be the most attractive strategy in creating the circular plastic economy. Here, we successfully prepared a pair of enantiopure O-heterocyclic lactones bearing with pendent phenyl substituent, which are named (2S,7R)-7-methyl-2-phenyl-1,4-dioxepan-5-one (SR-M1) and (2R,7R)-7-methyl-2-phenyl-1,4-dioxepan-5-one (RR-M2), respectively, by using the methanolysis product of poly(3-hydroxybutyrate) (P3HB) as the raw material. The well-controlled ring-opening polymerizations of SR-M1 and RR-M2 were achieved in the presence of MeAl[salen] as the catalyst to produce poly(ether-ester)s with controlled molecular weights, narrow dispersities, and well-defined terminal groups. The monomer stereoconfiguration has a big impact on their polymerization kinetics and thermodynamics as well as the thermal and mechanical properties of resultant polyesters. Both the resultant P(SR-M1) and P(RR-M2) exhibited closed-loop recyclability. The depolymerization of resultant polyesters back to pristine monomers can be easily realized using stannous octoate as the catalyst in solution.

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Integration of upcycling and closed-loop recycling through alternative cyclization–depolymerization

Abstract: Currently, to address the problem of end-of-life plastics, scientific researchers are urgently looking for the future generation of polymers and technologies that contribute to upcycling and closed-loop recycling. In this...

Cited by 23 publications

References 50 publications

Advances in the Synthesis of Chemically Recyclable Polymers

Advances in the Synthesis of Chemically Recyclable Polymers

Leveraging the monomer structure for high-performance chemically recyclable semiaromatic polyesters

Crystalline Stereoregular Poly(ether-ester) via MeAl[Salen]-Catalyzed Well-Controlled Ring-Opening Polymerization of Enantiopure Cyclic Ether-Ester Monomer

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