食品科学 ›› 2019, Vol. 40 ›› Issue (8): 8-14.doi: 10.7506/spkx1002-6630-20180208-112

• 食品化学 • 上一篇    下一篇

抗菌性无定型纳米二氧化钛/聚乳酸膜的制备及表征

尹忠琳,陈桂芸,曲亮璠,陈 野,邢鸿雁   

  1. 1.天津科技大学食品工程与生物技术学院,天津 300457;2.天津科技大学机械工程学院,天津 300457
  • 出版日期:2019-04-25 发布日期:2019-05-05
  • 基金资助:
    国家自然科学基金面上项目(31271974;31401678)

Preparation and Properties of Antibacterial Amorphous Titanium Dioxide-Polylactic Acid Composite Films

YIN Zhonglin, CHEN Guiyun, QU Liangfan, CHEN Ye, XING Hongyan   

  1. 1. College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China; 2. College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300457, China
  • Online:2019-04-25 Published:2019-05-05

摘要: 溶胶-凝胶法水解异丙醇钛制备纳米二氧化钛(TiO2)溶液,进行粒径优化及表征。紫外光谱、红外光谱、X射线衍射、粒径测试结果表明制备的纳米TiO2为较高可见光利用率的无定型纳米粒子。采用溶液共混法制备聚乳酸/纳米二氧化钛(polylactic acid/nano-TiO2,PLA/nano-TiO2)复合膜,研究不同纳米TiO2质量分数对PLA/nano-TiO2复合膜的性质影响。结果表明,PLA/nano-TiO2复合膜中纳米TiO2质量分数为0.6%时拉伸强度达到最大值,为63.3 MPa,此时断裂伸长率最小,为2.3%。PLA/nano-TiO2复合膜接触角均低于纯PLA膜,从78.40°减小到72.83°;PLA/nano-TiO2复合膜的吸水率显著高于纯PLA膜,从0.56%提高为1.48%;PLA/nano-TiO2复合膜水蒸气透过率比纯PLA膜高,从3.46×10-8(g·m)/(m2·h·Pa)提高到4.66×10-8(g·m)/(m2·h·Pa)。由PLA/nano-TiO2复合膜的抑菌性实验可知,添加纳米TiO2的复合膜在紫外光照下有明显的抑菌效果。

关键词: 无定型纳米二氧化钛, 聚乳酸, 复合膜, 力学性能, 抗菌性

Abstract: Nano-titanium dioxide (TiO2) solution was prepared from titanium tetraisopropoxide (TTIP) using the solgel method. The molar ratio between TTIP and water was optimized for smaller particle size. The nano-titanium dioxide was amorphous nanoparticles with high visible light utilization as characterized by Fourier transform infrared (FTIR) spectroscopy, UV spectroscopy, X-ray diffraction and particle size analysis. Furthermore polylactic acid/titanium dioxide (PLA/nano-TiO2) composite film was prepared by solution blending method, and the properties of composite films with different titanium dioxide contents were studied. The PLA/0.6% nano-TiO2 composite film had the maximum tensile strength of 63.3 MPa and the minimum elongation at break of 2.3%. The water resistance test indicated that the contact angle of the PLA/nano-composite film was lower than that of pure PLA film (72.83° versus 78.40°). In addition, the water absorption rate of was significantly higher than that of pure PLA film (1.48% versus 0.56%) and there was also an increase in water vapor permeability as compared to pure PLA film (4.66 × 10-8 (g·m)/(m2·h·Pa) versus 3.46 × 10-8 (g·m)/(m2·h·Pa)). Meanwhile, the composite film had a significant antibacterial effect under ultraviolet light.

Key words: amorphous nanotitanium dioxide, polylactic acid, composite film, mechanical properties, antibacterial activity

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