Antimicrobial activities of hydrophilic polyurethane/titanium dioxide complex film under visible light irradiation

作者：Zhang Xiaodong; Su Haijia^*; Zhao Yan; Tan Tianwei

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2008, 199(2-3): 123-129.

DOI：10.1016/j.jphotochem.2008.05.002

• hydrophilic
• polyurethane
• nano-TiO2
• antimicrobial
• visible light

Using the polyurethane (PU) resin modified by anion surfactant, the hydrophilic polyurethane/titanium dioxide (TiO2) complex film (HPTF) was prepared. The characteristics of the HPTF were described by Fourier-transform infrared spectrometry (FT-IR), ultraviolet-visible spectroscopy (UV-vis) and standard measurements of mechanical properties. Simultaneously, the antimicrobial activities of the HPTF were also studied. The results indicated that, after 8 h, nearly all of the Escherichia coli (E. coli) and Candida albicans (C albicans) could be killed under visible light irradiation; the antimicrobial activity was evidently better than pristine polyurethane film. The antimicrobial ratio of the latter was less than 40% under the same conditions. The optimal TiO2 amount in the HPTF preparation was 0.25 g (TiO2)/100 ml, (emulsion). The antimicrobial activity of the HPTF under visible light was in accordance with the UV-vis absorption spectra, in which strong absorption extended over the visible light spectra region. The combination of the dodecyl sulfonate group and titanium dioxide with polyurethane was found via FT-IR.

• 单位
  北京化工大学