Laboratorio de Nanocelulosa y Biomateriales, Departamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Beauchef 851, Santiago, Chile.
Biopolymer Research and Engineering Lab (BiopREL), Escuela de Nutrición y Dietética, Universidad de los Andes, Chile.
Carbohydr Polym. 2018 Sep 1;195:89-98. doi: 10.1016/j.carbpol.2018.04.059. Epub 2018 Apr 21.
Microfibrillated cellulose (MFC) obtained from eucalyptus was embedded in gelatin from two sources; namely bovine and salmon gelatin. Raman spectroscopy revealed that stress is transferred more efficiently from bovine gelatin to the MFC when compared to salmon gelatin. Young's modulus, tensile strength, strain at failure and work of fracture of the nanocomposite films were improved by ∼67, 131, 43 y 243% respectively when using salmon gelatin as matrix material instead of bovine gelatin. Imaging of the tensile fracture surface of the MFC-gelatin nanocomposites revealed that crack formation occurs predominantly within bovine and salmon gelatin matrices rather than within the MFC or at the MFC/gelatin interface. This suggests that the mechanical failure mechanism in these nanocomposite materials is predominantly governed by a matrix-cohesive fracture mechanism. Both strength and flexibility are desirable properties for composite coatings made from gelatin-based materials, and so the findings of this study could assist in their utilization in the food and pharmaceutical industry.
从桉树中提取的微原纤纤维素 (MFC) 被嵌入两种来源的明胶中；即牛源明胶和三文鱼源明胶。拉曼光谱显示，与三文鱼源明胶相比，牛源明胶能更有效地将应力传递到 MFC。当使用三文鱼源明胶作为基质材料而不是牛源明胶时，纳米复合材料薄膜的杨氏模量、拉伸强度、断裂应变和断裂功分别提高了约 67%、131%、43%和 243%。对 MFC-明胶纳米复合材料拉伸断裂表面的成像显示，裂纹主要在牛源明胶和三文鱼源明胶基质中形成，而不是在 MFC 或 MFC/明胶界面中形成。这表明，这些纳米复合材料的力学失效机制主要由基质内聚断裂机制控制。对于由明胶基材料制成的复合涂层来说，强度和柔韧性都是理想的性能，因此本研究的结果可能有助于它们在食品和制药行业的应用。
