earticle

영어

In this work, the effects of nano TiO2 on functionality and stability of low density polyethylene (LDPE) composite films were investigated for food packaging application. LDPE-nano TiO2 composite films were prepared with various TiO2 contents (0, 0.5, 1.0, 3.0 and 5.0wt%) by melt-extrusion and their basic properties such as crystallinity, chemical bonds and surface morphology were examined by XRD, FTIR and SEM. Ultraviolet (UV) light barrier property of asprepared LDPE-nano TiO2 composite films was also studied and the presence of nano TiO2 resulted in significant improvement of UV light barrier compared to the pure LDPE film. To evaluate influence of nano TiO2 on LDPE properties required as packaging material, thermal, mechanical, gas barrier and optical properties of LDPE-nano TiO2 composite films were characterized with various analytical techniques including TGA, UTM, OTR, WVTR and UV-vis spectroscopy. As a result, except optical property of LDPE, no significant effects were found in other properties. Opacity of pure LDPE was greatly increased with increasing concentration of nano TiO2.