Bridging Food Packaging and Biomedical Applications Using Stimuli-Responsive Natural Polymer–Nanoclay Composites

The escalating demand for sustainable, high-performance materials has significantly propelled research into natural polymer–nanoclay composites as viable alternatives to petroleum-based plastics and conventional biomaterials. Natural polymers, such as cellulose, chitosan, and alginate, inherently offer biodegradability, biocompatibility, and diverse chemical functionalities. However, their standalone utility is often constrained by inadequate mechanical strength, thermal stability, and barrier performance. The strategic incorporation of naturally occurring nanoclays, including montmorillonite and halloysite nanotubes, effectively mitigates these limitations by providing structural reinforcement, enhancing barrier properties, and enabling tunable bioactive delivery capabilities. This research direction critically examines recent advancements in the design, interfacial chemistry, and multifunctional performance of these composites. A particular focus is placed on understanding

stimuli-responsive behavior and optimizing bioactive loading strategies. Mechanisms governing responses to pH, temperature, moisture, ionic strength, and light are explored in relation to controlled release and adaptive functionality. A comparative perspective highlights how shared material principles are tailored to meet the distinct performance and regulatory requirements of both food packaging (e.g., shelf-life extension, antimicrobial activity) and biomedical applications (e.g., wound healing, drug delivery). Fabrication approaches, scale-up challenges, and safety considerations relevant to both sectors are also addressed, providing a comprehensive framework for M.Tech level investigation.

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