Procedure for producing polyurethane / polyaniline composites and application

Abstract

The subject of the invention includes the process of obtaining transparent composites of bio-based polyurethanes with polyaniline, as well ar their application for food packaging with biosensor properties. Polyurethane polymer matrices enable a homogeneous dispersion of polyaniline, whose condutive and optical properties change in the presence of gases produced during food spoilage, as well as in response to the pH value changes of the surrounding environment. This mechanism enables a continuous and reliable visual indication of product freshness in real-time. In another aspect of the invention' s implementation, the polyurethane matrix is functionalized with self-healing properties, therby extending the packaging life and preventing damage that could affect the sensory efficiency. The structures of polyurethane and composite with polyaniline were confirmed by FTIR spectroscopy. Thermal stability was evaluated by thermogravimetric analysis (TGA), which revealed that the incorporation of PANI significantly improved the degradation resistance of the biopolymer matrices.