Organic Letters, Год журнала: 2025, Номер unknown
Опубликована: Янв. 31, 2025
We report a directing group (DG)-enabled strategy for polyamide depolymerization. Pyridine-based DGs selectively interact with In(III) catalysts, activating amide bonds catalytic cleavage via alcoholysis. The process achieves efficient depolymerization of DG-introduced polyamides into recyclable monomers, providing sustainable chemical recycling approach robust polyamides.
Язык: Английский
Advanced Materials, Год журнала: 2024, Номер 36(28)
Опубликована: Май 17, 2024
Thermoset elastomers have been extensively applied in many fields because of their excellent mechanical strengths and durable characteristics, such as an chemical resistance. However, the context environmental issues, nonrecyclability thermosets has become a major barrier to further development these materials. Here, well-tailored strategy is reported solve this problem by introducing mismatched supramolecular interactions (MMSIs) into covalently cross-linked poly(urethane-urea) network with dynamic acylsemicarbazide moieties. The MMSIs significantly strengthen toughen thermoset elastomer effectively dissipating energy resisting external stress. In addition, recycling efficiency improved 2.7-fold due superior reversibility MMSIs. optimized features outstanding including ultrahigh tensile strength (110.8 MPa), unprecedented toughness (1245.2 MJ m
Язык: Английский
Процитировано
46
Nature Communications, Год журнала: 2024, Номер 15(1)
Опубликована: Март 20, 2024
Abstract Only a small proportion of global plastic waste is recycled, which most mechanically recycled into lower quality materials. The alternative, chemical recycling, enables renewed production pristine materials, but generally comes at high energy cost, particularly for processes like pyrolysis. This review focuses on light-driven approaches chemically recycling and upcycling waste, with emphasis reduced consumption selective transformations not achievable heat-driven methods. We focus challenging to recycle backbone structures composed mainly C‒C bonds, lack functional groups i.e., esters or amides, that facilitate e.g., by solvolysis. discuss the use light, either in conjunction heat drive depolymerization monomers via photocatalysis transform polymers valuable molecules. structural prerequisites these are outlined, highlighting their advantages as well limitations. conclude an outlook, addressing key challenges, opportunities, provide guidelines future photocatalyst (PC) development.
Язык: Английский
Процитировано
38
Chemical Engineering Journal, Год журнала: 2024, Номер 498, С. 155227 - 155227
Опубликована: Авг. 30, 2024
Язык: Английский
Процитировано
29
JACS Au, Год журнала: 2024, Номер 4(8), С. 2746 - 2766
Опубликована: Авг. 8, 2024
Photocatalysis is a versatile and rapidly developing field with applications spanning artificial photosynthesis, photo-biocatalysis, photoredox catalysis in solution or supramolecular structures, utilization of abundant metals organocatalysts, sustainable synthesis, plastic degradation. In this Perspective, we summarize conclusions from an interdisciplinary workshop young principal investigators held at the Lorentz Center Leiden March 2023. We explore how diverse fields within photocatalysis can benefit one another. delve into intricate interplay between these subdisciplines, by highlighting unique challenges opportunities presented each multidisciplinary approach drive innovation lead to solutions for future. Advanced collaboration knowledge exchange across domains further enhance potential photocatalysis. Artificial photosynthesis has become promising technology solar fuel generation, instance, via water splitting CO
Язык: Английский
Процитировано
22
Nature Communications, Год журнала: 2024, Номер 15(1)
Опубликована: Июнь 7, 2024
The regulation of topological structure covalent adaptable networks (CANs) remains a challenge for epoxy CANs. Here, we report strategy to develop strong and tough supramolecular thermosets with rapid reprocessability room-temperature closed-loop recyclability. These were constructed from vanillin-based hyperbranched resin (VanEHBP) through the introduction intermolecular hydrogen bonds dual dynamic bonds, as well formation intramolecular cavities. structures confer remarkable energy dissipation capability thermosets, leading high toughness strength. Due imine exchange reversible noncovalent crosslinks, can be rapidly effectively reprocessed at 120 °C within 30 s. Importantly, efficiently depolymerized room temperature, recovered materials retain structural integrity mechanical properties original samples. This may employed design tough, recyclable practical applications.
Язык: Английский
Процитировано
21
ACS Catalysis, Год журнала: 2024, Номер 14(16), С. 12437 - 12453
Опубликована: Авг. 5, 2024
Synthetic polymers play an indispensable role in modern society, finding applications across various sectors ranging from packaging, textiles, and consumer products to construction, electronics, industrial machinery. Commodity plastics are cheap produce, widely available, versatile meet diverse application needs. As a result, millions of metric tons manufactured annually. However, current approaches for the chemical recycling postconsumer plastic waste, primarily based on pyrolysis, lag efficiency compared their production methods. In recent years, significant research has focused developing milder, economically viable methods commodity plastics, which involves converting waste back into monomers or transforming it other valuable chemicals. This Perspective examines both cutting-edge laboratory-scale contributing advancements field recycling.
Язык: Английский
Процитировано
12
Advanced Composites and Hybrid Materials, Год журнала: 2025, Номер 8(2)
Опубликована: Март 4, 2025
Abstract Sequential dual-curing epoxy composites, such as the thiol-epoxy system, can potentially open new capabilities for end-products in composite industry. This system remains stable after initial curing and undergo further reactions when exposed to a second stimulus, use of magnetic induction: remote energy-efficient alternative. study reports first resin reinforced with nanoparticles Fe 3 O 4 . The addition endows polymer matrix dual-stimuli shape memory, triggered by both conventional heating field, broadening potential applications. examined various manufacturing conditions loadings 4, which improved mechanical properties composites. dual-response memory was evaluated heat source fields, resulting ~ 100% fixation recovery ratio either stimulus source, superior performance under field. Furthermore, moderate able reach temperatures high 160 °C, influence parameters on efficiency induction studied statistical analysis design experiments. Additionally, two proofs concept were presented. In first, step performed situ generated successfully fixing temporary into permanent form sample. concept, utilized smart switch or threshold temperature sensor. Graphical
Язык: Английский
Процитировано
2
Polymer Journal, Год журнала: 2024, Номер 56(4), С. 369 - 377
Опубликована: Янв. 4, 2024
Язык: Английский
Процитировано
7
Macromolecules, Год журнала: 2024, Номер 57(4), С. 1725 - 1733
Опубликована: Фев. 10, 2024
Cross-linked polymer networks fabricated with renewable resources are being actively sought for tackling the resource crisis. Meanwhile, dynamic cleavable groups further promote recycling and degradation. Herein, a vanillin-derived trifunctional compound containing dithioacetal moiety was found to be an efficient cross-linker making polyurethane (PUNs) coexisting phenolic carbamate groups. The dual-dynamic PUNs were featured faster stress relaxation over monodynamic PUNs, good stability in acidic environments, thermally promoted recyclability. Moreover, photocleavage of realized under blue light (460 nm) trigger network This work represents appealing molecular design realize photodegradable via introducing dithioacetals, which could potentially degraded different wavelengths.
Язык: Английский
Процитировано
7
Communications Chemistry, Год журнала: 2024, Номер 7(1)
Опубликована: Фев. 20, 2024
As the effective use of carbon resources has become a pressing societal issue, importance chemical recycling plastics increased. The catalytic decomposition for is promising approach creating valuable products under efficient and mild conditions. Although several commodity engineering have been applied, decompositions stable resins composed strong main chains such as polyamides, thermoset resins, super are underdeveloped. Especially, that high heat resistance, low solubility nearly unexplored. In addition, many robust aromatic ethers, which difficult to cleave. Herein, we report depolymerization-like oxyphenylene-based polyetheretherketone polysulfone using thiols via selective carbon-oxygen chain cleavage form electron-deficient arenes with sulfur functional groups bisphenols. catalyst combination bulky phosphazene base P
Язык: Английский
Процитировано
7