Paper Information

Journal:   IRANIAN JOURNAL OF FOOD SCIENCE AND TECHNOLOGY   FEBRUARY 2017 , Volume 13 , Number 60; Page(s) 187 To 197.
 
Paper:  EFFECT OF TIO2 NANOPARTICLES ON MECHANICAL AND TRANSPORT PROPERTIES OF POLYETHYLENE TEREPHTHALATE (PET) PACKAGES
 
Author(s):  FARHOODI M.*, MOUSAVI M., SOTUDEH GHAREBAGH R., EMAM DJOMEH Z., OROMIEHIE A.R.
 
* DEPARTMENT OF FOOD SCIENCE AND TECHNOLOGY, NATIONAL NUTRITION AND FOOD TECHNOLOGY RESEARCH INSTITUTE, FACULTY OF NUTRITION AND FOOD TECHNOLOGY, SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCES, TEHRAN, IRAN
 
Abstract: 

Nowadays the nanoparticles have been extensively developed in food industry, particularly food packaging systems. The incorporation of nanoparticles in the packaging material can improve the mechanical, thermal and barrier properties of the packaging material. In this study, polyethylene terephthalate (PET) /TiO2 nanocomposites were prepared by melt blending of PET and TiO2 nanoparticles. The morphology of the prepared nanocomposite films was investigated by scanning electron microscopy (SEM). UV-Visible spectroscopy was used to study the transparency of prepared films. Gravimetric method was employed for measuring water vapor permeability of films. Thermal and mechanical properties were performed using differential scanning calorimetry (DSC) and tension test, respectively. The transmittance decreased considerably in TiO2 nanocomposites compared to neat polymer in both UV and visible range. The incorporation of nanofillers especially at 3% wt. loading level increased the crystallinity of PET. The results of mechanical test showed that the ductility of nanocomposites was enhanced compared to neat polymer. The parameters elongation at break and dissipated energy are measures of polymer ductility. Incorporation of nanoparticles into packaging material matrix noticeably decreased the water vapor permeability of PET. In general, TiO2 nanoparticles improved the mechanical and thermal properties of PET packages. Gas permeability of prepared nanocomposite films decreased due to increased diffusion path. Improvement of packaging material characteristics could have an interactive role in extending the shelf life of foods.

 
Keyword(s): NANOCOMPOSITE PACKAGES, PERMEABILITY, MECHANICAL PROPERTIES, POLY (ETHYLENE TEREPHTHALATE), TITANIUM DIOXIDE NANOPARTICLES