Qin Yang, Wang Wentao, Zhang Hui, Dai Yangyong, Hou Hanxue, Dong Haizhou
Department of Food Science and Engineering, Shandong Agricultural University, 61 Daizong Street, Tai'an 271000, China.
Engineering and Technology Center for Grain Processing of Shandong Province, Tai'an 271000, China.
Materials (Basel). 2018 Jun 23;11(7):1064. doi: 10.3390/ma11071064.
The knowledge gained from starch-nanocomposite-film research has not been fully applied commercially because of the lack of appropriate industrial processing techniques for nanofillers and starch films. Three organically modified montmorillonites (OMMTs) were prepared using a semidry kneading method. The effects of the OMMTs on the structures and properties of starch nanocomposite films, prepared by extrusion blowing, were investigated. The X-ray diffraction (XRD) analysis results revealed that the OMMTs with various quaternary ammonium salts possessed differing layer structures and d-space values. The results of the XRD and Fourier-transform infrared spectroscopy (FT-IR) showed that the starch⁻OMMT interaction resulted in a structural change, namely the starch⁻OMMT films possessed a balanced exfoliated and intercalated nanostructure, while the starch⁻MMT film possessed an exfoliated nanostructure with non-intercalated montmorillonite (MMT). The results of the solid-state nuclear magnetic resonance (NMR) analysis suggested that the starch-OMMT nanocomposite possessed comparatively large quantities of single-helix structures and micro-ordered amorphous regions. The starch⁻OMMT films exhibited good tensile strength (TS) (maximum of 6.09 MPa) and water barrier properties (minimum of 3.48 × 10 g·m·m·s·Pa). This study indicates that the addition of OMMTs is a promising strategy to improve the properties of starch films.
由于缺乏适用于纳米填料和淀粉膜的工业加工技术，从淀粉纳米复合膜研究中获得的知识尚未得到充分的商业应用。采用半干法制备了三种有机改性蒙脱土（OMMT）。研究了OMMT对挤出吹塑制备的淀粉纳米复合膜结构和性能的影响。X射线衍射（XRD）分析结果表明，含有不同季铵盐的OMMT具有不同的层结构和d-间距值。XRD和傅里叶变换红外光谱（FT-IR）结果表明，淀粉与OMMT的相互作用导致了结构变化，即淀粉-OMMT膜具有平衡的剥离和插层纳米结构，而淀粉-MMT膜具有含有未插层蒙脱土（MMT）的剥离纳米结构。固态核磁共振（NMR）分析结果表明，淀粉-OMMT纳米复合材料具有相对大量的单螺旋结构和微有序非晶区。淀粉-OMMT膜表现出良好的拉伸强度（TS）（最大值为6.09 MPa）和阻水性能（最小值为3.48×10 g·m·m·s·Pa）。本研究表明，添加OMMT是改善淀粉膜性能的一种有前景的策略。
