Top-down vitrimerization of commercial polymer materials: A practical pathway toward sustainability

Vitrimers fabricated through either bottom-up design or top-down modification have attracted growing interest due to their unique combination of multifunctionality and sustainability. Compared with traditional bottom-up synthesis routes, top-down vitrimerization strategies show particular promise because they retain the inherent advantages of commercial polymers, including high performance, low cost, and scalability. While mechanical recycling, chemical treatments, and biotechnological approaches have been explored to address plastic waste, achieving both effective recyclability and property retention remains challenging. This review systematically summarizes recent advances in the vitrimerization of commercial polymer materials for performance upgrading and waste recycling. We focus on both thermoplastic and thermoset systems, highlighting how dynamic covalent chemistry and network reorganization govern processing behavior and properties. By linking molecular exchange mechanisms with macroscopic performance, we clarify the relationship between vitrimer structure and vitrimerization pathways. Key design principles relevant to scalable manufacturing are discussed, along with current limitations and emerging opportunities. Finally, future prospects for the practical implementation of vitrimerization in sustainable polymer engineering are outlined.