成型方法对纳米纸表面形貌与光学性能的影响

Effects of Different Preparation Procedures on the Surface Morphology and Optical Properties of Cellulose Nanopapers

通过TEMPO氧化、高压均质作用成功从机械预处理后的针叶木纤维中,抽离出直径20~25nm、长度几百纳米到几微米的纤维素纳米纤丝(CNFs);然后以此为原料分别采用浇铸、真空抽滤的方法制备纳米纸。使用环境扫描电镜,原子力显微镜、紫外/可见/近红外分光光度计研究了不同成型方法对纳米纸的表面形貌、表面粗糙度、透光率和光学雾度等性能的影响。结果表明,浇铸法与真空抽滤法相比,通过浇铸法制备的纳米纸表面更加光滑(均方根表面粗糙度为3.3nm);具有更加优异的光学性能,在600nm处透光率为89%,在550nm处雾度为2.9%,此浇铸法更适合于制备高透明高清晰的纳米纸。

After TEMPO oxidation and high pressure homogeneous, the cellulose nanofibrils were successfully extracted from the soft wood fiber which was pretreated by mechanical treatments. Then through the casting and vacuum filtration methods, the cellulose nanofibrils was fabricated into nanopapers. Effects of different preparation procedures on the surface morphology, surface roughness, light transmittance and optical haze of cellulose nanopapers were studied by environment scanning electron microscope （SEM）, atomic force microscope （AFM）, and UV/VIS/ NIR spectrophotometer. Compared with vacuum filtration, nanopapers produced by casting have more smooth surface （root-mean-square roughness of 10.6 nm） and more excellent optical properties： a high transmittance （89%） at 600 nm, a low haze （2.9 % ） at 550 nm. Therefore, the casting procedure is recommended for preparing highly transparent and clear nanopapers. Keywords：