Mass-Produced Chemically Recyclable Aromatic Polymers with Exceptional Strength and Stability

ACS Macro Letters, Год журнала: 2025, Номер unknown, С. 735 - 742

Опубликована: Май 15, 2025

Developing chemically recyclable polymers that offer ultrahigh mechanical strength, exceptional chemical stability, mild recycling conditions, and scalability for mass production remains a significant challenge. This study presents novel class of plastics, synthesized at kilogram scale in the laboratory, by reversibly cross-linking aromatic polyamide macromonomers with boroxines, imine bonds, hydrogen bonds. These denoted as PA-B3O3, exhibit an impressive tensile strength 142.1 MPa, Young's modulus 2.39 GPa, glass transition temperature ∼211.6 °C, outstanding resistance to acidic/basic aqueous solutions organic solvents. PA-B3O3 plastics can be depolymerized mixed solvent N,N-dimethylacetamide HCl solution, allowing efficient recovery original amino-terminated (PA-NH2) via precipitation selective solvents, even when polymer waste streams. represents advancement toward practical application mechanically robust, resistant, polymers.

Язык: Английский

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Upcycling of Carbon Fiber/Thermoset Composites into High‐Performance Elastomers and Repurposed Carbon Fibers

Angewandte Chemie, Год журнала: 2024, Номер 136(22)

Опубликована: Март 16, 2024

Abstract Recycling of carbon fiber‐reinforced polymer composites (CFRCs) based on thermosetting plastics is difficult. In the present study, high‐performance CFRCs are fabricated through complexation aromatic pinacol‐cross‐linked polyurethane (PU−AP) thermosets with fiber (CF) cloths. PU−AP exhibit a breaking strength 95.5 MPa and toughness 473.6 MJ m −3 contain abundant hydrogen‐bonding groups, which can have strong adhesion CFs. Because high interfacial between CF cloths thermosets, CF/PU−AP possess tensile >870 MPa. Upon heating in N , ‐dimethylacetamide (DMAc) at 100 °C, pinacols be cleaved, generating non‐destructive linear polymers that converted to elastomers. The elastomers mechanically robust, healable, reprocessable, damage‐resistant an extremely 74.2 fracture energy 149.6 kJ −2 . As result, dissociation enables recovery reusable elastomers, thus realizing upcycling composites.

Язык: Английский

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Chemically Recyclable, Reprocessable, and Mechanically Robust Reversible Cross-Linked Polyurea Plastics for Fully Recyclable Aramid Fiber Reinforced Composites

ACS Macro Letters, Год журнала: 2024, Номер unknown, С. 1515 - 1520

Опубликована: Окт. 25, 2024

Aramid fiber reinforced composites (AFRCs) have received increasing attention because of their excellent comprehensive performance including high mechanical strength, modulus, and light weight. However, full recycling AFs from ARCFs is difficult to achieve. Herein, fully recyclable are fabricated using reversible cross-linked polyurea plastics (PUHA) as the matrix. PUHA by cross-linking linear hemiaminal groups. By changing main chain structures, two types prepared with performance, which comparable that traditional engineering plastics. can be reprocessed at least five times without losing original properties dynamic exchangeability Meanwhile, rapidly depolymerized into under acidic conditions. When used a matrix fabricate AFRCs, AFRCs exhibit strength. Moreover, due simple chemical ability plastics, decomposed intact purity. This work presents use in fabrication provides future direction developing high-performance fiber-reinforced composites.

Язык: Английский

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High-modulus supramolecular glassy polymers: a review

Materials Chemistry Frontiers, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

The concept of recyclability or repairability provides a new approach for extending the service life glassy polymers and addressing environmental pollution issues.

Язык: Английский

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Low Dielectric and High Thermal Conductivity Polyimide Nanocomposites with Fully Closed-Loop Recycling and Highly Consistent Healing

Composites Part B Engineering, Год журнала: 2025, Номер unknown, С. 112390 - 112390

Опубликована: Март 1, 2025

Язык: Английский

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Synthesis and Tunable Properties of Chemically Recyclable Multiblock Copolymers via Tandem Olefin Metathesis Polymerizations

Macromolecules, Год журнала: 2025, Номер unknown

Опубликована: Апрель 8, 2025

Язык: Английский

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Plastics–Fertilizer Homology: Solid-Phase Molecular Assembly Enables Natural Closed-Ring Cycle of Biomass-like Plastics

ACS Materials Letters, Год журнала: 2025, Номер unknown, С. 1646 - 1653

Опубликована: Март 31, 2025

Язык: Английский

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Water-mediated phase separation evolution toward mechanically robust yet room-temperature reprocessable polymer materials

Matter, Год журнала: 2025, Номер unknown, С. 102099 - 102099

Опубликована: Апрель 1, 2025

Язык: Английский

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Modular access to aliphatic polycarbonates with tunable properties and dual closed‐loop recyclability by polycondensation−depolymerization−repolymerization strategy

Angewandte Chemie, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

Abstract Great achievements have been made in CO 2 /epoxide copolymerization and dialkyl carbonate/diol polycondensation; however, efficient preparation of high‐molecular‐weight (>100 kDa) aliphatic polycarbonates with tunable properties recyclability under mild conditions still remains as a great challenge. Herein, we presented “polycondensation–depolymerization–repolymerization” strategy for structurally diverse polycarbonates. This involved step growth polycondensation carbonate diol to low‐molecular‐weight (0.5−1.9 atmosphere pressure, which are then utilized produce cyclic monomers through catalytic depolymerization. The ring‐opening polymerization led high molecular weight polymers, can be converted back monomer via ring‐closing depolymerization or diol/dialkyl alcoholysis, enabling chemical recycling dual closed loops. thermal mechanical the widely adjusted by varying substituent, polycarbonate four‐membered spiro‐cyclic substituent shows recorded melting temperature (217 °C) strength within reported family. A(hard)‐B(soft)‐A(hard) triblock thermoplastic elastomers good performance elastic recovery were also created sequential polymerization. “polycondensation−depolymerization−repolymerization” provided powerful toolbox developing high‐performance

Язык: Английский

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Modular access to aliphatic polycarbonates with tunable properties and dual closed‐loop recyclability by polycondensation−depolymerization−repolymerization strategy

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

Abstract Great achievements have been made in CO 2 /epoxide copolymerization and dialkyl carbonate/diol polycondensation; however, efficient preparation of high‐molecular‐weight (>100 kDa) aliphatic polycarbonates with tunable properties recyclability under mild conditions still remains as a great challenge. Herein, we presented “polycondensation–depolymerization–repolymerization” strategy for structurally diverse polycarbonates. This involved step growth polycondensation carbonate diol to low‐molecular‐weight (0.5−1.9 atmosphere pressure, which are then utilized produce cyclic monomers through catalytic depolymerization. The ring‐opening polymerization led high molecular weight polymers, can be converted back monomer via ring‐closing depolymerization or diol/dialkyl alcoholysis, enabling chemical recycling dual closed loops. thermal mechanical the widely adjusted by varying substituent, polycarbonate four‐membered spiro‐cyclic substituent shows recorded melting temperature (217 °C) strength within reported family. A(hard)‐B(soft)‐A(hard) triblock thermoplastic elastomers good performance elastic recovery were also created sequential polymerization. “polycondensation−depolymerization−repolymerization” provided powerful toolbox developing high‐performance

Язык: Английский

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