Effect of nano-TiO2 on the physical, mechanical and optical properties of pullulan film

Yaofa Liu; Yuanyuan Liu; Ke Han; Ying Cai; Meihu Ma; Qunyi Tong; Long Sheng

doi:10.1016/j.carbpol.2019.04.073

Effect of nano-TiO₂ on the physical, mechanical and optical properties of pullulan film

Carbohydr Polym. 2019 Aug 15:218:95-102. doi: 10.1016/j.carbpol.2019.04.073. Epub 2019 Apr 27.

Authors

Yaofa Liu¹, Yuanyuan Liu¹, Ke Han¹, Ying Cai¹, Meihu Ma¹, Qunyi Tong², Long Sheng³

Affiliations

¹ National Research and Development Center for Egg Processing, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
² The State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China.
³ National Research and Development Center for Egg Processing, College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China. Electronic address: stheaven16@126.com.

PMID: 31221349
DOI: 10.1016/j.carbpol.2019.04.073

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-TiO_2. 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.

Keywords: Nano-TiO(2); Nanocomposite; Polysaccharide film; Pullulan.