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Poly(ethylene terephthalate) (PET) is an important polymer with an annual output second only to polyethylene. The development of PET recycling technologies is therefore necessary to not only eliminate the harm associated with white pollution and microplastics, but also to reduce carbon emissions. Antibacterial PET, one of the most high‐value advanced materials, has improved the ability to treat bacterial infections. However, current methods of manufacturing commercial antibacterial PET require blending with an excess of metal‐based antibacterial agents, which leads to biotoxicity and a nonpersistent antibacterial activity. In addition, high‐efficiency organic antibacterial agents have yet to be employed in antibacterial PET due to their poor thermal stabilities. Herein, a solid‐state reaction for the upcycling of PET waste using a novel hyperthermostable antibacterial monomer is described. This reaction is catalyzed by the residual catalyst present in the PET waste. It is found that a catalytic amount of the antibacterial monomer enabled the low‐cost upcycling of PET waste to produce high‐value recycled PET with a strong and persistent antibacterial activity, as well as similar thermal properties to the virgin PET. This work provides a feasible and economic strategy for the large‐scale upcycling of PET waste and exhibits potential for application in the polymer industry.

Dentin bonding is the most common form of human tissue repair among tissue-biomaterials adhesions, concerning billions of people’s oral health worldwide. However, insufficient adhesive infiltration in demineralized dentin matrix (DDM)...

Upcycling of Plastic Waste An optimal approach for the upcycling of plastics is reported by Weipu Zhu and co‐workers in article number 2210758, which permits the direct manufacture of high‐value advanced materials and avoids monomer regeneration. More specifically, a novel strategy is provided for directly upcycling poly(ethylene terephthalate) waste to high‐value antibacterial products. This procedure, which employs a catalytic amount of an antibacterial monomer, exhibits potential for application in the polymer industry.

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