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抗菌性无定型纳米二氧化钛/聚乳酸膜的制备及表征
引用本文:尹忠琳,陈桂芸,曲亮璠,陈野,邢鸿雁.抗菌性无定型纳米二氧化钛/聚乳酸膜的制备及表征[J].食品科学,2019,40(8):8-14.
作者姓名:尹忠琳  陈桂芸  曲亮璠  陈野  邢鸿雁
作者单位: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
基金项目:国家自然科学基金面上项目(31271974;31401678)
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  

Preparation and Properties of Antibacterial Amorphous Titanium Dioxide-Polylactic Acid Composite Films
YIN Zhonglin,CHEN Guiyun,QU Liangfan,CHEN Ye,XING Hongyan.Preparation and Properties of Antibacterial Amorphous Titanium Dioxide-Polylactic Acid Composite Films[J].Food Science,2019,40(8):8-14.
Authors:YIN Zhonglin  CHEN Guiyun  QU Liangfan  CHEN Ye  XING Hongyan
Institution: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
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.
Keywords:amorphous nanotitanium dioxide  polylactic acid  composite film  mechanical properties  antibacterial activity  
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