制备具有紫外防护功能的青稞壳聚糖/纳米 ZnO 纳米复合材料：物理和机械性能。
Preparation of UV-protective kefiran/nano-ZnO nanocomposites: physical and mechanical properties.
机构信息
Department of Food Science and Engineering, Campus of Agriculture and Natural Resources, University of Tehran, P.O. Box 4111, Karaj, Iran.
Bioprocessing and Biodetection Laboratory, Department of Food Science and Engineering, Campus of Agriculture and Natural Resources, University of Tehran, P.O. Box 4111, Karaj, Iran.
出版信息
Int J Biol Macromol. 2015 Jan;72:41-6. doi: 10.1016/j.ijbiomac.2014.07.047. Epub 2014 Aug 6.
In this study, we investigated the effect of ZnO nanoparticles (ZN) as a UV-protective agent of kefiran biopolymers. Our results showed that with increasing ZN content, the tensile strength, elongation at break, and tensile energy to break the kefiran film and nanocomposites also increased. Kefiran nanocomposites with a ZN content higher than 2% produced a UV-protective film with good visual properties, low sensibility to water, and low water-vapor permeability. The thermal properties of all specimens, analyzed by DSC, showed that the ZN content had a negative effect on Tg and a positive effect on nanocomposites' melting point. TEM, SEM micrography and XRD spectrum analysis confirmed the hypothesis that ZNs act like a ball bearing, making movement of kefiran chains easier and increasing elongation at break, while simultaneously decreasing the Tg of kefiran nanocomposites.
在这项研究中，我们研究了氧化锌纳米粒子（ZN）作为壳聚糖生物聚合物的紫外防护剂的效果。我们的结果表明，随着 ZN 含量的增加，壳聚糖膜和纳米复合材料的拉伸强度、断裂伸长率和拉伸能量也随之增加。ZN 含量高于 2%的壳聚糖纳米复合材料可形成具有良好视觉性能、低水分敏感性和低水蒸气透过率的紫外防护膜。通过 DSC 分析所有样品的热性能表明，ZN 含量对 Tg 有负面影响，对纳米复合材料的熔点有积极影响。TEM、SEM 显微照片和 XRD 谱分析证实了 ZN 作为滚珠的作用假设，使壳聚糖链的运动更容易，并增加断裂伸长率，同时降低壳聚糖纳米复合材料的 Tg。
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