Chemical Upcycling of Conventional Polyureas into Dynamic Covalent Poly(aminoketoenamide)s

Article Chemistry, Multidisciplinary

Suppressing Creep and Promoting Fast Reprocessing of Vitrimers with Reversibly Trapped Amines

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Summary: A straightforward chemical strategy was developed to improve the properties of VU vitrimers by controlling the availability of exchangeable functional groups at the molecular level.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2022)

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Mechanically Interlocked Vitrimers

Jun Zhao et al.

Summary: Mechanically interlocked vitrimers (MIVs) are a new class of MINs that combine vitrimer chemistry with mechanically interlocked structures to address challenges. Experimental results demonstrate that MIVs exhibit improved mechanical performance, including Young's modulus, toughness, and damping capacity.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Physical

Solving the difficult recyclability of conventional thermosetting polyurea elastomers based on commercial raw materials in a facile way

Yuan Lei et al.

Summary: In this study, a series of conventional thermosetting polyurea elastomers (TPUEs) were designed and prepared using commercial raw materials. These TPUEs exhibit remarkable solvent resistance, thermal stability, and transparency, with mechanical properties superior to most dynamic materials and commercial elastomers. Analysis shows that these TPUEs have superior dynamic properties and can maintain significant mechanical performance and chemical stability after multiple recycling.

JOURNAL OF MATERIALS CHEMISTRY A (2022)

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Article Chemistry, Multidisciplinary

Reversing RAFT Polymerization: Near-Quantitative Monomer Generation Via a Catalyst-Free Depolymerization Approach

Hyun Suk Wang et al.

Summary: Researchers reported an efficient, catalyst-free depolymerization method for polymers made by reversible addition-fragmentation chain transfer (RAFT) polymerization, with up to 92% yield. Their approach exploited the high end-group fidelity of RAFT polymers to generate chain-end radicals triggering rapid unzipping, enabling reconstruction of linear polymers or creation of new insoluble gels.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Chemistry, Multidisciplinary

Chemical Upcycling of Commercial Polystyrene via Catalyst-Controlled Photooxidation

Sewon Oh et al.

Summary: This study reports a technique for the chemical upcycling of polystyrene into benzoyl products, primarily benzoic acid, through a catalyst-controlled photooxidative degradation method. The results demonstrate that this method is efficient in degrading polystyrene and producing targeted small molecule products.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Multidisciplinary Sciences

Critical advances and future opportunities in upcycling commodity polymers

Coralie Jehanno et al.

Summary: The majority of plastic waste is not degraded, leading to permanent pollution. Chemical recycling and upcycling provide new opportunities for sustainable plastic economy.

NATURE (2022)

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Review Materials Science, Multidisciplinary

Elastic vitrimers: Beyond thermoplastic and thermoset elastomers

Jiancheng Luo et al.

Summary: Thermoset elastomers possess mechanical robustness, high thermal/chemical resistance, and good dimensional stability, making them widely used in industry and frontier research. However, the presence of permanent crosslinks significantly limits their recyclability. Vitrimers, polymer networks with associative exchangeable crosslinkers, provide a solution for the circularity of thermoset elastomers. This review focuses on the design, synthesis, fundamental physics, and property evaluation of elastic vitrimers based on different types of dynamic covalent bonds. Control over the network parameters allows for tailoring of mechanical performance, network dynamics, self-healing capability, and recyclability. The responsive behavior of elastic vitrimers to external stimuli such as temperature, light, and moisture can be controlled due to the dynamic nature of reversible chemical bonds. The review also discusses the critical physical parameters of elastic vitrimers and their comparison with commonly used thermoset and thermoplastic elastomers, as well as the merits, bottlenecks, and future research directions of elastic vitrimers for practical applications in various fields.

MATTER (2022)

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Review Chemistry, Multidisciplinary

Dynamic Covalent Polymer Networks: A Molecular Platform for Designing Functions beyond Chemical Recycling and Self-Healing

Ning Zheng et al.

Summary: Dynamic covalent polymer networks have shown unique roles in chemical recycling and self-healing, with recent advancements in dynamic chemistry and material concepts leading to promising applications in energy, electronics, and beyond. The design versatility and functional properties offered by DCPN have gained traction, with opportunities in shape-shifting materials, artificial muscles, and network topologies manipulation. Additionally, molecular design strategies for exploiting functional material properties have been a focus, showing potential for shaping the future alongside classical thermoplastic and thermoset polymers.

CHEMICAL REVIEWS (2021)

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Manuel Haeussler et al.

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NATURE (2021)

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Article Polymer Science

Polyureas Versatile Polymers for New Academic and Technological Applications

Jeferson Santos Santana et al.

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POLYMERS (2021)

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Article Materials Science, Multidisciplinary

Vitrimers: Current research trends and their emerging applications

Jie Zheng et al.

Summary: The development of recyclable plastics is a key research focus with vitrimeric materials attracting attention as a renewable plastic option. Their dynamic covalent crosslinks provide stability and reprocessability, making them a promising alternative to traditional thermosets. Emerging applications of vitrimers include self-healing, malleability, orthogonal processability, and multiple shape memory properties.

MATERIALS TODAY (2021)

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Article Chemistry, Multidisciplinary

Olefin metathesis-based chemically recyclable polymers enabled by fused-ring monomers

Devavrat Sathe et al.

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NATURE CHEMISTRY (2021)

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Review Multidisciplinary Sciences

Toward polymer upcycling-adding value and tackling circularity

LaShanda T. J. Korley et al.

Summary: Chemical recycling and polymer upcycling offer solutions to the challenges of plastic waste heterogeneity and property reductions, enabling circularity and reducing energy consumption and environmental impacts. The industrial adoption of these approaches is encouraging and plays a critical role in addressing the fate of plastics and advancing next-generation materials design.

SCIENCE (2021)

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Article Polymer Science

Molecularly Designed Additives for Chemically Deconstructable Thermosets without Compromised Thermomechanical Properties

K. E. L. Husted et al.

Summary: The study introduces a new additive that can introduce chemically cleavable bonds into thermoset materials without compromising thermomechanical properties, enabling material deconstruction and enhancing sustainability.

ACS MACRO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Toward Stimuli-Responsive Dynamic Thermosets through Continuous Development and Improvements in Covalent Adaptable Networks (CANs)

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Fusion of Different Crosslinked Polymers Based on Dynamic Disulfide Exchange

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Mechanically Gated Degradable Polymers

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Chemical Upcycling of Conventional Polyureas into Dynamic Covalent Poly(aminoketoenamide)s

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