Polymeric schiff base materials: From molecular engineering to advanced technological applications

Polymeric Schiff base materials have emerged as a versatile class of functional polymers owing to their dynamic covalent linkages, tunable physicochemical properties, and strong metal-coordination ability. Through rational molecular design, these materials can incorporate diverse functional groups, extended conjugation, and tailored active sites, enabling broad applicability across advanced technologies. This review summarizes recent progress in the synthesis and structural engineering of polymeric Schiff bases, including conventional condensation routes, green synthetic strategies, and the development of hybrid architectures. The relationships between structure and key properties-such as thermal stability, electronic conductivity, and chelation capability-are critically analyzed to provide fundamental insights into their performance. Particular emphasis is placed on their ability to form stable metal–polymer complexes, which significantly enhance their functionality in catalysis, energy storage, and sensing applications. Their diverse applications are discussed, spanning heterogeneous catalysis, environmental remediation, drug delivery, antimicrobial systems, electrochemical and optical sensing, and energy devices such as supercapacitors and batteries. Additionally, emerging hybrid systems integrating Schiff bases with frameworks including MOFs, COFs, graphene, and MXenes are highlighted for their multifunctional potential. Finally, key challenges related to stability, processability, and scalability are addressed, alongside future perspectives focusing on sustainable synthesis and smart material design for next-generation applications.