Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, USA.
Bioresour Technol. 2010 Aug;101(15):5961-8. doi: 10.1016/j.biortech.2010.02.104. Epub 2010 Mar 23.
Films of microfibrillated celluloses (MFCs) from pulps of different yields, containing varying amounts of extractives, lignin, and hemicelluloses, were produced by combining refining and high-pressure homogenization techniques. MFC films were produced using a casting-evaporation technique and the physical and mechanical properties (including density, roughness, fold endurance and tensile properties) were determined. Homogenization of bleached and unbleached Kraft pulps gave rise to highly individualized MFCs, but not for thermo-mechanical pulp (TMP). The resulting MFC films had a roughness equivalent to the surface upon which the films were cast. Interestingly, after homogenization, the presence of lignin significantly increased film toughness, tensile index, and elastic modulus. The hornification of fibers through a drying and rewetting cycle prior to refining and homogenization did not produce any significant effect compared to films from never-dried fibers, indicating that MFC films can potentially be made from low-cost recycled cellulosic materials.
采用结合精制和高压匀浆技术，从不同得率、含有不同含量的抽出物、木质素和半纤维素的纸浆中制备出微纤维化纤维素（MFC）薄膜。采用浇铸蒸发技术制备 MFC 薄膜，并测定其物理和机械性能（包括密度、粗糙度、耐折度和拉伸性能）。对漂白和未漂白牛皮纸浆进行匀浆处理会产生高度个体化的 MFC，但对热机械浆（TMP）则不然。所得 MFC 薄膜的粗糙度与薄膜浇铸的表面相当。有趣的是，匀浆后，木质素的存在显著提高了薄膜的韧性、拉伸指数和弹性模量。与从未干燥过的纤维制成的薄膜相比，在精制和匀浆之前通过干燥和再润湿循环使纤维角质化并没有产生任何显著效果，这表明 MFC 薄膜有可能由低成本的回收纤维素材料制成。
