Polymer nanocomposites in biomedical applications: Challenges and opportunities

The rapid progress of nanotechnology has profoundly reshaped the development of biomaterials, leading to the emergence of polymer nanocomposites as advanced platforms for biomedical applications. Polymer nanocomposites consist of a polymeric matrix reinforced with nanoscale fillers such as nanoparticles, nanofibers, or nanotubes, which collectively impart superior physicochemical, mechanical, and biological properties compared to conventional polymers. Their increasing relevance in biomedicine is attributed to their ability to mimic native tissue architecture, enhance therapeutic performance, and address limitations of traditional biomaterials, including inadequate mechanical strength, limited bioactivity, and poor control over drug release profiles. With the growing demand for safer, more effective, and patient-specific healthcare solutions, polymer nanocomposites have gained considerable attention due to their multifunctional nature. This review critically examines the challenges and opportunities associated with polymer nanocomposites in major biomedical applications, including drug delivery systems, tissue engineering, wound healing, and medical devices. A systematic literature search was performed using major scientific databases such as Web of Science, PubMed, Scopus, and Google Scholar.Peer-reviewed studies were analysed with emphasis on recent advances in synthesis strategies, material characterisation techniques, and biomedical performance. The reviewed literature highlights that polymer nanocomposites demonstrate enhanced biocompatibility, tunable mechanical properties, controlled and targeted drug delivery, and notable antimicrobial activity. Despite these advantages, several challenges persist, including potential nanotoxicity, regulatory complexities, reproducibility issues, and constraints related to large-scale manufacturing. Although extensive research exists, there remains a lack of integrated reviews correlating material performance with biosafety, regulatory compliance, and manufacturability. Addressing these gaps is essential for successful clinical translation and commercial adoption of polymer nanocomposites.