Abstract
In this study, the potentiality of biodegradable barrier films prepared from polyvinyl alcohol (PVA) and calcium carbonate (CaCO3) nanoparticles has been examined at different pressures and temperatures for film packaging applications. For this purpose, CaCO3 nanoparticles, synthesized through a reverse microemulsion route, were loaded into PVA by dint of solution casting. In order to elucidate the influence of CaCO3 nanoparticles on the PVA properties, morphological, mechanical, thermal, crystallinity, gas permeability, and biodegradability studies were conducted. Microscopic images revealed that CaCO3 nanoparticles, with different concentrations (5, 15, and 20 wt%), were uniformly dispersed within the PVA matrix, and gas permeation analysis also showed that gas permeability oxygen (O2) and carbon dioxide (CO2) through the PVA films was considerably decreased with introducing nanoparticles. It was also observed that gas permeability soared with increasing temperature and declined with loading pressure. Furthermore, albeit over-loading nanoparticles (up to 20 wt%) increased the thermal properties of the as-prepared nanocomposites, the mechanical properties of PVA tapered off. Moreover, biodegradability study demonstrated that CaCO3 nanoparticles increased the PVA degradation.
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