Physicomechanical Characteristics of Polylactic Acid Films Containing Photo-assisted and Ultrasound-assisted Green Synthesized Silver Nanoparticles Using Nettle Extract
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Nanoparticles improve protective characteristics of biodegradable packaging. The aim of this study was to investigate physicomechanical characteristics of polylactic acid film containing 1, 2 and 3% silver nanoparticles synthesized using photo-assisted and ultrasound-assisted methods and aqueous extract of nettle ( Urtica dioica ). Formation of silver nanoparticles was verified using UV-vis spectroscopy. Photochemical and sonochemical synthesized silver nanoparticles were monodisperse with particle sizes of 91.28 and 68.06 nm and polydispersity indices of 0.382 and 0.371, respectively. Solubility and water absorption decreased with silver nanoparticles, especially ultrasound-assisted synthesized ones, into polylactic acid films ( p < 0.05). Nanocomposites containing 2 and 3% of ultrasound-assisted synthesized silver nanoparticles showed the highest tensile strength and elongation at break. Fourier transform infrared spectroscopy verified the role of nettle extract as a decreasing, stabilizing and capping agent of silver nanoparticles. In fingerprint region of the spectra, presence of Ag-O bonding and synthesis of silver nanoparticles were verified. Silver nanoparticles improved the thermal stability of polylactic acid nanocomposite films. Therefore, use of silver nanoparticles is recommended to improve physicomechanical and thermal characteristics of polylactic acid films.
