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Upcycling waste commodity polymers into high-performance polyarylate materials with direct utilization of capping agent impurities
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Upcycling waste commodity polymers into high-performance polyarylate materials with direct utilization of capping agent impurities
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Journal Article
Upcycling waste commodity polymers into high-performance polyarylate materials with direct utilization of capping agent impurities
2025
Overview
Commodity polymers are ubiquitous in our society, having replaced many inorganic and metal-based materials due to their versatile properties. However, their functionality heavily relies on the addition of various components known as additives, making it challenging to recycle the polymer fraction of plastic materials effectively. Thus, it is crucial to develop efficient chemical recovery strategies for commodity polymers and additives to facilitate the direct utilization of recovered monomers and additives without additional purification. Here, we develop a strategy for co-upcycling two types of waste commodity polymers, polycarbonate, and polyethylene terephthalate into polyarylate, a high-performance transparent engineering plastic. By incorporating a highly active metal-free ionic liquids catalyst for methanolysis and a two-stage interface polymerization technique with variable temperature control, we successfully prepare polyacrylate film materials from real end-of-life plastics with direct utilization of capping agent impurities in recovered monomers. These materials exhibit excellent thermal performance (Tg = 192.8 °C), transmittance (reach up to 86.73%), and flame-retardant properties (V-0, UL-94), equivalent to those of commercial polyarylate (U-100, about $10000/ton), and could be further easily close-loop recycled. Demonstrated in kilogram-scale experiments and life cycle assessments, this approach offers a low-carbon, environmentally friendly, and economically feasible pathway for upcycling waste commodity polymers.
Recycling of commodity plastics remains challenging due to the presence of additives and mixed waste streams. Here the authors develop a strategy for co-upcycling polycarbonate, and polyethylene terephthalate, two types of waste commodity polymers, into polyarylate, a high-performance transparent engineering plastic.
