Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
College of Life Science, Agricultural University of Hebei, Baoding, Hebei, 071001, China.
Sci Rep. 2017 Jan 23;7:41075. doi: 10.1038/srep41075.
Biobased nanocomposite films for food packaging with high mechanical strength and good oxygen-barrier performance were developed using a hot-water wood extract (HWE). In this work, a facile approach to produce HWE/montmorillonite (MMT) based nanocomposite films with excellent physical properties is described. The focus of this study was to determine the effects of the MMT content on the structure and mechanical properties of nanocomposites and the effects of carboxymethyl cellulose (CMC) on the physical properties of the HWE-MMT films. The experimental results suggested that the intercalation of HWE and CMC in montmorillonite could produce compact, robust films with a nacre-like structure and multifunctional characteristics. This results of this study showed that the mechanical properties of the film designated F (91.5 MPa) were dramatically enhanced because the proportion of HWE, MMT and CMC was 1:1.5:0.05. In addition, the optimized films exhibited an oxygen permeability below 2.0 cm μm/day·m·kPa, as well as good thermal stability due to the small amount of CMC. These results provide a comprehensive understanding for further development of high-performance nanocomposites which are based on natural polymers (HWE) and assembled layered clays (MMT). These films offer great potential in the field of sustainable packaging.
采用热水木材提取物（HWE）开发了具有高机械强度和良好氧气阻隔性能的用于食品包装的生物基纳米复合膜。在这项工作中，描述了一种生产具有优异物理性能的 HWE/蒙脱土（MMT）基纳米复合材料的简便方法。本研究的重点是确定 MMT 含量对纳米复合材料结构和力学性能的影响，以及羧甲基纤维素（CMC）对 HWE-MMT 薄膜物理性能的影响。实验结果表明，HWE 和 CMC 在蒙脱土中的插层可以产生具有珍珠母状结构和多功能特性的紧密、坚固的薄膜。研究结果表明，由于 HWE、MMT 和 CMC 的比例为 1:1.5:0.05，因此指定为 F（91.5 MPa）的薄膜的机械性能得到了显著增强。此外，由于 CMC 的用量少，优化后的薄膜的氧气透过率低于 2.0 cm μm/day·m·kPa，并且具有良好的热稳定性。这些结果为进一步开发基于天然聚合物（HWE）和组装层状粘土（MMT）的高性能纳米复合材料提供了全面的认识。这些薄膜在可持续包装领域具有巨大的潜力。
