Xiao Qian, Huang Min, Zhou Xiaolan, Dai Miaoqi, Zhao Zhengtao, Zhou Hui
School of Food Science and Technology, Hunan Agricultural University, 410128 Hunan, China.
Department of Food Science, University of Guelph, Guelph, ON N1G 2W1, Canada.
Polymers (Basel). 2021 Sep 27;13(19):3291. doi: 10.3390/polym13193291.
This research studied the effect of molecular weight (M) and degree of substitution (DS) on the microstructure and physicochemical characteristics of methylcellulose (MC) films with or without SNC. The M and DS of three types of commercial MC (trade name of M20, A4C, and A4M, respectively) were in the range of 0.826 to 3.404 × 10 Da and 1.70 to 1.83, respectively. M significantly affected the viscosity of methylcellulose solutions as well as the microstructure and tensile strength of methylcellulose films, while DS had a pronounced effect on their oxygen permeability properties. The incorporation of 15% () SNC resulted in the efficient improvement of tensile strength, water, and oxygen barrier properties of films, particularly for the A4C nanocomposite films. The results from SEM and FTIR illustrated that relatively homogenous dispersion of SNC was distinguished in A4C-15% () SNC films. Furthermore, microstructures of MC-SNC nanocomposite films were strongly dependent on both M and DS of MC. This work offers a convenient and green method to fabricate MC-based nanocomposite films with desirable mechanical, light, oxygen, and water vapor barrier properties.
本研究考察了分子量（M）和取代度（DS）对含或不含SNC的甲基纤维素（MC）薄膜微观结构和理化特性的影响。三种市售MC（商品名分别为M20、A4C和A4M）的M和DS范围分别为0.826至3.404×10 Da和1.70至1.83。M显著影响甲基纤维素溶液的粘度以及甲基纤维素薄膜的微观结构和拉伸强度，而DS对其透氧性能有显著影响。加入15%（）的SNC可有效提高薄膜的拉伸强度、阻水和阻氧性能，尤其是对于A4C纳米复合薄膜。扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）结果表明，在A4C - 15%（）SNC薄膜中SNC分散相对均匀。此外，MC - SNC纳米复合薄膜的微观结构强烈依赖于MC的M和DS。这项工作提供了一种简便、绿色的方法来制备具有理想机械、光学、阻氧和阻水蒸气性能的基于MC的纳米复合薄膜。
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