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Transforming Waste Polyvinyl Chloride into Strong Adhesives by NiCl 2 ‐Catalyzed Amination at Near‐Ambient Temperature
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Researchers developed a single-step method to convert waste polyvinyl chloride (PVC) into high-performance adhesives via NiCl2-catalyzed amination under near-ambient conditions, achieving bonding strengths exceeding 2000 kPa—comparable to commercial cyanoacrylate adhesives—while bypassing traditional depolymerization routes and demonstrating excellent flame retardancy.
Addressing the escalating global challenge of plastic waste management demands innovative solutions. While conventional recycling predominantly depolymerizes plastics into small-molecule intermediates, direct, single-step conversion of waste plastics into functional end-products remains scarce. Herein, we reported a novel method for direct transformation of waste polyvinyl chloride (PVC) into high-performance adhesives via NiCl2-catalyzed amination. This process substituted CCl bonds with ammonia, assisted by tributyl(cyanomethyl)phosphonium chloride (CTPC) under near-ambient conditions. Adhesive performance directly correlated with PVC amination degree, semiquantitatively analyzed by 1H NMR of modified PVC. Crucially, the resulting adhesive achieved >2000 kPa bonding strength-comparable to commercial cyanoacrylate adhesive (Model 502) under identical conditions-while exhibiting excellent environmental adaptability and flame retardancy. This approach offers significant advantages including single-step simplicity and mild processing requirements. Most importantly, it bypasses traditional small-molecule pathways, establishing a streamlined route for upcycling waste feedstock into practical adhesives.
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