Effect of TiO2 Nanoparticles on Barrier and Mechanical Properties of PVA Films

Nanocomposites made of nanoparticles embedded in the matrix of polymer membranes have been used in the food packaging industry due to their enhanced barrier and mechanical properties. In this study, nanocomposite films made of polyvinyl alcohol (PVA) and titanium dioxide nanoparticles (size = 20 nm, 1 and 2 wt%) were prepared by the solvent casting method and their mechanical, physical, and barrier properties were determined. Scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) were performed for characterizing the morphology of PVA/TiO2 nanocomposite films. Water vapor permeability (WVP) and oxygen transmission rate (OTR) were measured for mixed matrix PVA films for two concentrations of TiO2 nanoparticles. The results revealed that OTR and WVP decreased with increasing TiO2 nanoparticle concentration. Elongation at the break point and Young’s modulus both increased whereas strength decreased. XRD measurements confirmed the completely dispersed structure formed in the TiO2 nanocomposites. SEM micrographs showed an identical distribution at 1 and 2 wt% levels of TiO2 nanoparticles.