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Effect of nano-TiO2 on the physical, mechanical and optical properties of pullulan film
Yaofa Liu1, Yuanyuan Liu1, Ke Han1
1National Research and Development Center for Egg Processing, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
Abstract:
In this study, effects of nano-TiO2 on the microstructural, physical, mechanical and optical properties of pullulan films were investigated. The results showed that the addition of nano-TiO2 improved the water vapor barrier properties of the film due to the tortuous path formed by nano-TiO2. When the concentration of nano-TiO2 was 0.04 g/100 mL, the tensile strength of the film showed a maximum value (15.99 MPa). The elongation at break of the film continued to decrease with the increase of nano-TiO2. The TEM analysis showed that higher concentration of nano-TiO2 would cause greater aggregation. Meanwhile, the results of FTIR and low-field NMR indicated that the miscibility between pullulan and nano-TiO2 was due to the formation of intermolecular hydrogen bonds during film formation. Furthermore, the addition of nano-TiO2 significantly improved the film barrier properties to ultraviolet light.
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