Chemical Upcycling of Commercial Polystyrene via Catalyst-Controlled Photooxidation

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(13), С. 5745 - 5749

Опубликована: Март 23, 2022

Chemical upcycling of polystyrene into targeted small molecules is desirable to reduce plastic pollution. Herein, we report the benzoyl products, primarily benzoic acid, using a catalyst-controlled photooxidative degradation method. FeCl3 undergoes homolytic cleavage upon irradiation with white light generate chlorine radical, abstracting an electron-rich hydrogen atom on polymer backbone. Under oxygen-rich environment, high MW (>90 kg/mol) degrades down <1 kg/mol and produces up 23 mol % products. A series mechanistic studies showed that radicals promoted via hydrogen-atom abstraction. Commercial efficiently in our method, showing compatibility system fillers. Finally, demonstrated potential scaling approach photoflow process convert gram quantities PS acid.

Язык: Английский

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Recent advances in polymers and polymer composites for food packaging

Materials Today, Год журнала: 2022, Номер 53, С. 134 - 161

Опубликована: Фев. 21, 2022

Язык: Английский

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Sustainable polymers

Nature Reviews Methods Primers, Год журнала: 2022, Номер 2(1)

Опубликована: Июнь 16, 2022

Язык: Английский

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From trash to treasure: Chemical recycling and upcycling of commodity plastic waste to fuels, high-valued chemicals and advanced materials

Journal of Energy Chemistry, Год журнала: 2022, Номер 69, С. 369 - 388

Опубликована: Янв. 10, 2022

Язык: Английский

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Chemically recyclable polymer materials: polymerization and depolymerization cycles

Green Chemistry, Год журнала: 2022, Номер 24(6), С. 2321 - 2346

Опубликована: Янв. 1, 2022

The design and synthesis of chemically recyclable polymers, which can be reutilized as their starting monomers or new value-added chemicals, has provided a practical approach to address the end-of-use problem polymer materials possible closed-loop method for material usage. More more attention been paid exhibit an increasing prominent role in sustainable development. Nowadays, polymers including polyesters, polythioesters, polycarbonates, polyacetals, polyamides, so on have made significant achievements. Consequently, this minireview summarizes examples achieving polymerization–depolymerization cycle access are categorized into seven parts based monomers.

Язык: Английский

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Chemical upcycling of polyethylene, polypropylene, and mixtures to high-value surfactants

Science, Год журнала: 2023, Номер 381(6658), С. 666 - 671

Опубликована: Авг. 10, 2023

Conversion of plastic wastes to fatty acids is an attractive means supplement the sourcing these high-value, high-volume chemicals. We report a method for transforming polyethylene (PE) and polypropylene (PP) at ~80% conversion with number-average molar masses up ~700 670 daltons, respectively. The process applicable municipal PE PP their mixtures. Temperature-gradient thermolysis key controllably degrading into waxes inhibiting production small molecules. are upcycled by oxidation over manganese stearate subsequent processing. ꞵ-scission produces more olefin wax yields higher acid-number than does ꞵ-scission. further convert large-market-volume surfactants. Industrial-scale technoeconomic analysis suggests economic viability without need subsidies.

Язык: Английский

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Design principles for intrinsically circular polymers with tunable properties

Chem, Год журнала: 2021, Номер 7(11), С. 2896 - 2912

Опубликована: Ноя. 1, 2021

Язык: Английский

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Strong and Tough Supramolecular Covalent Adaptable Networks with Room‐Temperature Closed‐Loop Recyclability

Advanced Materials, Год журнала: 2022, Номер 35(7)

Опубликована: Ноя. 11, 2022

Development of closed-loop chemically recyclable plastics (CCRPs) that can be widely used in daily life a fundamental solution to the global plastic waste crisis. Hence, it is great significance develop easy-to-recycle CCRPs possess superior or comparable material properties commodity plastics. Here, novel dual crosslinked CCRP, namely, supramolecular covalent adaptable networks (supra-CANs), reported, which not only displays mechanical higher than strong and tough polycarbonate, but also exhibits excellent solvent resistance as thermosets. The supra-CANs are constructed by introducing reversible noncovalent crosslinks into dynamic polymer networks, resulting highly stiff thermosets exhibit thermoplastic-like ductile behaviors well reprocessability rehealability. In contrast, analogs do have (CANs) show elastomeric with significantly decreased strength. Importantly, developed CANs converted back initial monomers high yields purity at room temperature, even additives, enables sustainable polymer-monomer-polymer circulation. This work provides new design principles for high-performance polymers substitutes conventional

Язык: Английский

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Biobased High-Performance Aromatic–Aliphatic Polyesters with Complete Recyclability

Journal of the American Chemical Society, Год журнала: 2021, Номер 143(49), С. 20591 - 20597

Опубликована: Ноя. 29, 2021

The development of high-performance recyclable polymers represents a circular plastics economy to address the urgent issues plastic sustainability. Herein, we design series biobased seven-membered-ring esters containing aromatic and aliphatic moieties. Ring-opening polymerization studies showed that they readily polymerize with excellent activity (TOF up 2.1 × 105 h–1) at room temperature produce high molecular weight (Mn 438 kg/mol). variety functionalities allows us investigate substitution effect on polymerizability/recyclability monomers properties (such as Tgs from −1 79 °C). Remarkably, stereocomplexed P(M2) exhibited significantly increased Tm crystallization rate. More importantly, product P(M)s were capable depolymerizing into their in solution or bulk efficiency, thus establishing life cycle.

Язык: Английский

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Dynamic crosslinking compatibilizes immiscible mixed plastics

Nature, Год журнала: 2023, Номер 616(7958), С. 731 - 739

Опубликована: Апрель 26, 2023

Язык: Английский

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