China Plastics ›› 2023, Vol. 37 ›› Issue (2): 45-50.DOI: 10.19491/j.issn.1001-9278.2023.02.007

• Materials and Properties • Previous Articles     Next Articles

Preparation and performance of corn starch/TiO2 nanocomposite films

GAO Qiqi, HAO Yanling(), CHENG Long, SONG Xiaoshuang, WANG Shihui   

  1. School of Chemical and Biological Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China
  • Received:2022-11-26 Online:2023-02-26 Published:2023-02-22

Abstract:

TiO2 nanoparticles were incorporated into corn starch to prepare a series of biodegradable starch/TiO2 nanocomposite films for food packaging through ultrasonic dispersion and solution casting. The effect of TiO2 nanoparticles on the mechanical properties, water vapor resistance properties and antibacterial activities of the nanocomposite films were investigated. Scanning electron microscope, infrared spectrometer and X⁃ray diffractometer were used to characterize the morphology and microstructure of the films. The results indicated that the compatibility of corn starch with TiO2 nanoparticles was enhanced at a proper addition amount of TiO2 nanoparticles due to the formation of molecular association. Compared to pure starch film, the nanocomposite films achieved an effective improvement in mechanical performance and vapor barrier property. The nanocomposite film containing 0.8 wt% TiO2 nanoparticles presented tensile strength of 7.54 MPa and water vapor permeability of 5.50×10-5 g/(mm·d), which were 53.9 % higher and 23.5 % lower than those of pure starch film, respectively. The nanocomposite films exhibited a good antimicrobial capability and reduced transmittance of UV light.

Key words: starch, nano titanium dioxide, degradation, composite film

CLC Number: