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چکیده
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Nowadays, food security is one of the most compelling global challenges and is demanded by consumers and food manufacturers. However, development of food packaging systems are recommended for maintaining the maximum safety and quality of foods. Antimicrobial food packaging presents an excellent potential to be implemented as an innovative solution in food technology to reduce the rate of microbial growth in food and extend the shelf life of it. Nanocomposite LDPE films containing ZnO nanoparticles (1, 3, 3 g-ma, 5 wt.%) were prepared by melt mixing and hot press molding method. Pure LDPE film was consumed as a blank sample. Dispersion quality of antimicrobial nanoparticle distribution within the polymer matrix has been assessed by Transmission electron microscopy analysis (TEM). The mechanical properties of the films prepared were characterized by using stress-strain analysis. Rheological properties of nanocomposites were determined using rotational rheometers. The TEM results revealed that ZnO nanoparticles with spherical and granular morphology had uniform distribution within LDPE polymer. Moreover, the results showed the nanocomposites as possessing lower elongation at break and with the increase of each of nanofillers content but Young's modulus faces with an increase. Rheological properties demonstrate that the rheological moduli of the nanocomposites increases with increasing the nanofiller concentration so that the high frequency region is more benefited by this effect.
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