Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 333, Taiwan.
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, 333, Taiwan; Department of General Dentistry, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.
Carbohydr Polym. 2019 May 1;211:181-194. doi: 10.1016/j.carbpol.2019.01.114. Epub 2019 Feb 1.
In this work, κ-carrageenan bionanocomposite films were prepared by solution casting of a mixture of κ-carrageenan, glycerol, and various amounts of cellulose nanocrystals (CNCs, 0-9 wt.%). The structure and morphology of the bionanocomposite films were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Compared with κ-carrageenan films, the κ-carrageenan bionanocomposite films showed better mechanical and barrier properties (water and UV) and thermal stability. The water contact angle increased from 23.30° to 71.80° and the water vapor permeation decreased from 8.93 gm s Pa to 4.69 × 10 gm s Pa in the κ-carrageenan films loaded with 9-7 wt.% CNCs, respectively. The tensile strength and elongation at break of the films increased from 38.33 ± 3.79 MPa to 52.73 ± 0.70 MPa and from 21.50 ± 3.72% to 28.27 ± 2.39%, respectively, after CNC loading increased from 0 wt.% to 7.0 wt.%. These results indicated that the κ-carrageenan nanocomposite films have potential applications in food packaging.
在这项工作中，通过将κ-卡拉胶、甘油和不同量的纤维素纳米晶体（CNC，0-9wt.%）的混合物进行溶液浇铸制备了κ-卡拉胶生物纳米复合材料薄膜。通过傅里叶变换红外光谱、X 射线衍射、透射电子显微镜和扫描电子显微镜对生物纳米复合材料薄膜的结构和形态进行了表征。与κ-卡拉胶薄膜相比，κ-卡拉胶生物纳米复合材料薄膜表现出更好的机械和阻隔性能（水和紫外线）以及热稳定性。当 CNC 负载从 0wt.%增加到 7.0wt.%时，水接触角从 23.30°增加到 71.80°，水蒸气透过率从 8.93gm s Pa 降低到 4.69×10 gm s Pa。薄膜的拉伸强度和断裂伸长率分别从 38.33±3.79MPa 增加到 52.73±0.70MPa 和从 21.50±3.72%增加到 28.27±2.39%。这些结果表明，κ-卡拉胶纳米复合材料薄膜在食品包装方面具有潜在的应用。
