Faculty of Engineering, Department of Chemical Engineering, Anadolu University, Eskisehir 26555, Turkey.
Graduate School of Sciences, Department of Advanced Technologies, Nanotechnology, Anadolu University, Eskisehir 26555, Turkey.
Carbohydr Polym. 2015 Nov 20;133:284-93. doi: 10.1016/j.carbpol.2015.07.007. Epub 2015 Jul 13.
Biocomposites of chitosan (CS)/cellulose nanocrystals (CN) were prepared by using solution casting method. Influences of solution preparation method and CN content on the properties of composites were investigated. Mechanical stirring/ultrasonication or microfluidization were used to disperse nanocrystals in the chitosan matrix. The prepared nanocomposites were characterized by FTIR, XRD, SEM, DSC, TGA, TMA and contact angle measurements. SEM analysis revealed that microfluidization decreased CN aggregates in matrix. Formation of hydrogen bonds between CS and CN in nanocomposites prepared by using microfluidization was confirmed by FTIR spectroscopy. This high interaction led to an increment of the crystallinity of chitosan films. Tg values within a range of 53-58°C were obtained in DSC and TMA measurements. The thermal stability of CS film showed no significant effect of CN addition, whereas contact angle measurements revealed that CN addition resulted in an increment of hydrophilicity of chitosan films.
壳聚糖（CS）/纤维素纳米晶体（CN）的生物复合材料通过溶液浇铸法制备。研究了溶液制备方法和 CN 含量对复合材料性能的影响。机械搅拌/超声处理或微流化用于在壳聚糖基体中分散纳米晶体。通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、差示扫描量热法（DSC）、热重分析（TGA）、热机械分析（TMA）和接触角测量对制备的纳米复合材料进行了表征。SEM 分析表明，微流化处理减少了基体中的 CN 聚集体。通过傅里叶变换红外光谱（FTIR）证实了微流化处理制备的纳米复合材料中 CS 和 CN 之间形成氢键。这种高相互作用导致壳聚糖薄膜结晶度增加。在 DSC 和 TMA 测量中获得了 53-58°C 范围内的 Tg 值。CN 添加对 CS 薄膜的热稳定性没有显著影响，而接触角测量表明 CN 添加导致壳聚糖薄膜的亲水性增加。
