壳聚糖-纳米纤维素生物复合材料物理力学性能的优化。
Optimization of physical and mechanical properties for chitosan-nanocellulose biocomposites.
机构信息
Department of Food Material and Process Design Engineering, Faculty of Food Science and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Beheshti Avenue, Gorgan, Iran.
Department of Food Science and Technology, Faculty of Agriculture Engineering and Technology, College of Agriculture and Natural Resource, University of Tehran, Karaj, Iran.
出版信息
Carbohydr Polym. 2014 May 25;105:222-8. doi: 10.1016/j.carbpol.2014.01.094. Epub 2014 Feb 5.
Chitosan (CHT) is a biodegradable compound and has excellent performance in forming films; on the other hand, nanocellulose (NCL) crystals have low densities and are less expensive than other nanofillers. A novel and simple method was applied to develop CHT-NCL nanocomposite (NCP) from CHT powder of high molecular weight and NCL particles having two dimensions in nanoscale; a rotor stator and an ultrasound device were used to separate different nanolayers from each other and facilitate their dispersion into polymer matrix. The optimized NCP indicated superior mechanical properties compared with some synthetic films; approximate values of 47% elongation-at-break, 245MPa tensile strength and 4430MPa Young's modulus were achieved. Water vapour permeability (WVP) value of the NCP was at optimal level of 0.23×10(-11) (g/msPa) which was much less than the most biofilms' WVP values. FESEM analyses revealed that high concentrations of CHT and NCL composed inter-connected structures justifying high elongation capability of CHT-NCL NCP.
壳聚糖（CHT）是一种可生物降解的化合物，具有优异的成膜性能；另一方面，纳米纤维素（NCL）晶体密度低，比其他纳米填料便宜。应用一种新颖而简单的方法，从高分子量的 CHT 粉末和具有二维纳米级的 NCL 颗粒中开发出 CHT-NCL 纳米复合材料（NCP）；转子定子和超声装置用于将不同的纳米层彼此分离，并促进它们在聚合物基体中的分散。与一些合成膜相比，优化后的 NCP 表现出优异的力学性能；达到了约 47%的断裂伸长率、245MPa 的拉伸强度和 4430MPa 的杨氏模量。NCP 的水蒸气透过率（WVP）值处于最佳水平，为 0.23×10(-11)（g/msPa），远低于大多数生物膜的 WVP 值。FESEM 分析表明，高浓度的 CHT 和 NCL 组成了相互连接的结构，证明了 CHT-NCL NCP 具有高伸长率的能力。
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