为开发新型可食性包装材料,以纳米SiO2和阿拉伯胶为原料制备复合膜,研究了纳米SiO2添加量对复合膜的物理性能的影响,采用扫描电镜(scanning electron microscope,SEM)、红外光谱(Fourier transform infrared spectroscopy,FTIR)、X射线衍射光谱(X-ray diffraction,XRD)、差示扫描量热仪(differential scanning calorimetry,DSC)分析了膜的微结构。结果表明,10.00 g阿拉伯胶中添加0.25 g纳米SiO2时,复合膜透水透气性最低,拉伸强度最大,断裂伸长率最低;随着添加量增多,透光率下降;SEM分析表明,纳米SiO2添加量低于0.25 g时,表面平整;FTIR、XRD分析表明,纳米SiO2可使复合膜中的氢键增强,可改善膜的机械性能;DSC分析表明,纳米SiO2添加可以提高复合膜的熔融温度,添加0.25 g时,熔融温度为118 ℃。
In order to develop a new edible packaging material, the composite film of the nano-SiO2/ gum Arabic were prepared. The physical properties of the composite film with different amount of nano-SiO2 were studied, and the microstructure of the composite film was analyzed by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results showed that the composite film had the lowest permeability, the highest tensile strength and the lowest elongation at 0.25 g nano-SiO2 per 10.00 g gum Arabic, and the transmittance decreased with the increase of nano-SiO2. SEM analysis showed that the surface was smooth when the amount of nano-SiO2 was less than 0.25 g. FTIR and XRD analysis showed that nano-SiO2 could enhance the hydrogen bond in the composite film and improve the mechanical properties of the composite film. DSC analysis showed that nano-SiO2 could improve the melting temperature of the composite film. The highest melting temperature was 118 ℃ at 0.25 g of nano-SiO2.
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