Přehled o publikaci

*This functional sample represents an innovative polymeric material based on an acrylate matrix containing a copolymerized azo-derivative. The material utilizes the principle of light-induced E-Z isomerization, which is accompanied by a visible color change. This change is reversible: upon irradiation with a suitable wavelength (365 nm), the material transitions into a colored form (E-Z isomer) that is stable at low temperatures. When the temperature increases, thermodynamically controlled relaxation processes are activated, leading to back-isomerization and a return to the original color within minutes to hours. When the sample is stored in a freezing environment (-15 °C), the recorded information remains fully legible even after 7 months. Upon exposure to room temperature (22 °C), the record gradually disappears within 3 hours. Testing has shown that the addition of the azo-compound does not significantly affect the viscosity or the mechanical properties of the final product. The developed material has high potential as an intelligent temperature sensor for packaging applications, particularly in the food and pharmaceutical industries. It enables visual indication of cold chain breaches during storage, transport, and sale.