Effect of film multi-scale structure on the water vapor permeability in hydroxypropyl starch (HPS)/Na-MMT nanocomposites
Effect of film multi-scale structure on the water vapor permeability in hydroxypropyl starch (HPS)/Na-MMT nanocomposites
复制标题
薄膜多尺度结构对羟丙基淀粉(HPS)/Na-MMT纳米复合材料水蒸气透过性的影响
DOI：
10.1016/j.carbpol.2016.08.006
复制
发表时间：
2016-12-10
影响因子：
11.2
通讯作者：
Li, Bing
中科院分区：
文献类型：
--
作者：
Liu, Siyuan;Cai, Panfu;Li, Bing
为了提高淀粉基薄膜的耐水汽性能，将钠基蒙脱土（Na-MMT）作为纳米填料引入到羟丙基淀粉中，揭示了纳米填料在淀粉薄膜中的多尺度结构变化（包括分子间相互作用、短程构象、长程有序结构以及薄膜的聚集态结构）。水蒸气分子路径被曲折路径延长被普遍认为是耐水性提高的主要原因。然而，本研究观察到最低的水蒸气渗透率（WVP）是在3% Na-MMT/羟丙基淀粉（HPS）比例下，而不是5%，甚至纳米填料在这两种比例下都部分剥落。除了纳米填料引起的“曲折路径”外，这一观察结果表明，HPS链的短程构象、长程有序结构和聚集结构可能影响水阻隔性能。研究了WVP与薄膜多尺度结构的关系。结果表明，薄膜的非晶区短程构象、长程有序结构和聚集态结构之间的平衡是提高薄膜阻水性能的关键。(C)2016爱思唯尔有限公司版权所有
To improve the water vapor resistance of starch-based films, Na-MMT (Na-montmorillonite) as nanofillers were fabricated into hydroxypropyl starch and the multi-scale structural changes (including intermolecular interaction, short-range conformation, long-range ordered structure and the aggregated structure of the film) were revealed. The elongation of the water vapor molecule pathway by tortuous path is generally recognized as the main reason for the improvement of water resistance. However this study observed the lowest water vapor permeability (WVP) was at the 3% Na-MMT/hydroxypropyl starch (HPS) ratio instead of 5% even nanofillers were partially exfoliated at both ratio. Except for the "tortuous path" caused by nanofillers, this observation proposed that the short-range conformation of HPS chains, long-range ordered structure and the aggregated structure likely influenced the water barrier property. The relationship between WVP and multi-scale structure of the film was investigated. The results suggested that a good balance of short-range conformationin the amorphous region, long-range ordered structure and the aggregated structure of the film was required for the improvement of water vapor barrier property. (C) 2016 Elsevier Ltd. All rights reserved.