Department of Chemical Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran.
Department of Polymer Science and Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran.
Int J Biol Macromol. 2019 Jun 15;131:253-263. doi: 10.1016/j.ijbiomac.2019.03.083. Epub 2019 Mar 13.
In this work, a novel cross-linked wheat starch (CLWS)-based ternary nanocomposite films with incorporation of sodium montmorillonite (Na-MMT) (3%-7% wt.) and titanium dioxide (TiO) (1%-4% wt.) nanoparticles were fabricated using casting method. CLWS film exhibited better physical, mechanical and thermal properties compared with the native wheat starch (NWS) film. Incorporation of the nanoparticles into the film solution resulted in a decrease in water vapor permeability (WVP), water solubility (WS), moisture content (MC) of the films, whereas density increased. Nano-TiO blocked the UV light effectively and >99% of UV was removed by the film containing 4% TiO. Affecting by the addition of nanomaterials, the amounts of ultimate tensile strength (UTS) and Young's modulus (YM) values enhanced, while elongation at break (EB) ones diminished. By the Furrier transform infrared (FT-IR) spectroscopy, the creation of new hydrogen bonds between the starch's hydroxyl groups and nanomaterials was confirmed. Formation of a completely exfoliated structure for CLWS/Na-MMT/TiO nanocomposites was proved by XRD. SEM micrographs exhibited appropriate dispersion of nanomaterials through the films surface particularly at lower concentrations. The thermogravimetric analysis (TGA) results revealed that the addition of nanomaterials especially TiO improved the thermal stability of the nanocomposite films.
在这项工作中，采用浇注法制备了一种新型的交联小麦淀粉（CLWS）基三元纳米复合薄膜，其中掺入了钠蒙脱石（Na-MMT）（3%-7%wt.）和二氧化钛（TiO）（1%-4%wt.）纳米粒子。与天然小麦淀粉（NWS）薄膜相比，CLWS 薄膜具有更好的物理、机械和热性能。纳米粒子的掺入导致薄膜的水蒸气透过率（WVP）、水溶性（WS）和水分含量（MC）降低，而密度增加。纳米 TiO 有效地阻挡了紫外线，含有 4%TiO 的薄膜可去除>99%的紫外线。受纳米材料添加的影响，极限拉伸强度（UTS）和杨氏模量（YM）值增加，而断裂伸长率（EB）值降低。傅里叶变换红外（FT-IR）光谱证实了淀粉羟基基团与纳米材料之间形成了新的氢键。XRD 证明了 CLWS/Na-MMT/TiO 纳米复合材料形成了完全剥离的结构。SEM 显微照片显示，纳米材料在薄膜表面得到了适当的分散，特别是在较低的浓度下。热重分析（TGA）结果表明，纳米材料的添加，特别是 TiO 的添加，提高了纳米复合材料薄膜的热稳定性。
