Akademik Veri Yönetim Sistemi
POLYMER BULLETIN, cilt.79, sa.12, ss.11543-11566, 2022 (SCI-Expanded)
Polypyrrole (PPy) and metallic silver (Ag) particles were used as a new combination for food packaging applications. Due to numerous interesting properties offered by such materials, their use as a direct contact product in the food industry is of great interest. PPy was coated on cellulosic paper, previously extracted from carton packages of food and beverages, by an in situ chemical oxidative polymerization in the presence of two different oxidizing agents, namely iron chloride and silver nitrate. The first one, well known as a typical oxidant, led to PPy coating-doped chloride ions (PPy-Cl), while the second gives, after an electronic transfer between the monomer and silver cation, a composite containing polymer and metallic silver particles (PPy-Ag). The modification of the cellulosic paper was confirmed by Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectroscopies and scanning electron microscopy (SEM). On the other hand, the prepared materials were tested as antibacterial agents as well as sensors for toxic volatile organic compounds generally produced during food spoilage. The presence of metallic silver particles increases the antibacterial activity of our formulation compared to the system without silver. Furthermore, the significant change in the internal resistance of PPy-Ag composite when exposed to ammonia, acetone, methanol and ethanol vapors proved its high sensing properties.