Current Advances and Challenges in Chemical Recycling of Polymeric Materials

Опубликована: Окт. 8, 2023

Ranging from traditional food packaging, clothing, and furniture to the current small large electronic devices automobiles, plastics serve fulfill diverse demands in our daily lives. However, global plastic waste generation is dramatically escalating, currently standing at approximately 150 million metric tonnes annually. While some of regenerated recycled by mechanical methods can be used as their parent plastics, cost energy savings are limited multiple preliminary processes such sorting, shredding, washing, drying. Moreover, continuous recycling process degrades physical properties materials. In this context, chemical emerging a promising alternative method due its high efficiency, simple steps, reducing reliance on fossil resources, conversion into value-added chemicals. This review provides state-of-the-art overview contemporary polymeric materials via i) depolymerization: “polymers valuable molecules” ii) closed-loop cycles: monomers, and/or polymers”, encompassing both traditional/advanced depolymerization chemistries remaining challenges. These approaches contextualized within present industrial technologies, key design principles, specific case studies related distinct

Язык: Английский

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Ring‐opening Polymerization of Enantiopure Bicyclic Ether‐ester Monomers toward Closed‐loop Recyclable and Crystalline Stereoregular Polyesters via Chemical Upcycling of Bioplastic

Angewandte Chemie, Год журнала: 2023, Номер 135(23)

Опубликована: Апрель 5, 2023

Abstract Although great successes have been achieved, the preparation of closed‐loop recyclable polyesters with high working temperatures still remains as a big challenge. Herein, we present syntheses series enantiopure bicyclic ether‐ester monomers by upcycling poly(3‐hydroxybutyrate) bioplastic. The “living”/controlled ring‐opening polymerizations these to produce stereoregular controlled molecular weights and well‐defined chain ends were achieved. effects stereoconfiguration substituent on polymerization kinetics thermodynamics well thermal properties resultant investigated. Of note, are semi‐crystalline materials melting up 176 °C, even higher than commodity polyolefin plastics. These can be depolymerized back recover pristine monomers, thus successfully establishing life cycle.

Язык: Английский

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Cascade Ring Strain Release Polymerization of Cyclohexene Oxide and Derivatives Using a Mono(μ-Alkoxo)bis(alkylaluminum) Initiator

Macromolecules, Год журнала: 2023, Номер 56(13), С. 4884 - 4894

Опубликована: Июнь 30, 2023

Cyclohexene oxide (CHO) is a useful building block for the synthesis of novel materials and model substrate polymerization catalyst development. The driving force CHO derived from its bicyclic structure, which combines release enthalpy epoxide ring-opening (ca. −15 kcal/mol) twist-chair-to-chair conformation shift in cyclohexane ring −5 upon enchainment. lack regio-defined functional handles attached to monomer limits ability both pre- post-functionalize resultant establish structure–property relationships, reduces versatility currently accessible materials. We report two series derivatives with butyl, allyl, halogen substituents α β positions relative ring. Adding was found affect kinetics, 4-substituted (β) being more reactive than 3-substituted (α) analogs when initiated mono(μ-alkoxo)bis(alkylaluminum) pre-catalyst. Polymer thermal properties depended on substituent location identity. Halogenated rings were most produced highest glass transition temperatures polymers (up 105 °C). Density theory revealed possible mechanistic explanation consistent observed differences rate 3- CHOs combination steric thermodynamic considerations.

Язык: Английский

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Synthesis of cellulose graft cyclic anhydride and epoxide alternating copolyesters in a DBU/ DMSO/CO2 solvent system

Industrial Crops and Products, Год журнала: 2023, Номер 204, С. 117413 - 117413

Опубликована: Сен. 4, 2023

Язык: Английский

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Synthesis of biodegradable PGA-PBC-PGA triblock copolymers and closed-loop recycling via a thermal depolymerization strategy

Green Chemistry, Год журнала: 2023, Номер 25(23), С. 9998 - 10009

Опубликована: Янв. 1, 2023

This work provides a strategy for synthesizing PGA-PBC-PGA triblock copolymers and allows the recovery of GL within 3.0 h through depolymerization in an 82% yield.

Язык: Английский

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