Liu Andong, Berglund Lars A
Department of Fibre and Polymer Technology, Royal Institute of Technology, SE-10044 Stockholm, Sweden; Wallenberg Wood Science Center and Department of Fiber and Polymer Technology, Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Department of Fibre and Polymer Technology, Royal Institute of Technology, SE-10044 Stockholm, Sweden; Wallenberg Wood Science Center and Department of Fiber and Polymer Technology, Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Carbohydr Polym. 2012 Jan 4;87(1):53-60. doi: 10.1016/j.carbpol.2011.07.019. Epub 2011 Jul 19.
Clay nanopaper are nanocomposites with nacre-like structure and multifunctional characteristics including high modulus, significant strength and toughness as well as fire retardancy and low oxygen transmission rate (OTR). Montmorrilonite (MTM) and nanofibrillated cellulose (NFC) hydrocolloids are combined with a chitosan (CS) solution to form high MTM content nanopaper structures by the use of a previously developed papermaking approach. Chitosan functions as flocculation agent and decreases dewatering time to less than 10% compared with MTM-NFC clay nanopaper. The effect of chitosan on the clay nanopaper structure was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Properties were measured by uniaxial tensile testing, thermogravimetric analysis (TGA), OTR and moisture adsorption experiments. A nacre-like multilayered structure was confirmed and the chitosan-clay nanopaper showed favorable mechanical properties at clay contents as high as 44-48wt%.
粘土纳米纸是具有类似珍珠层结构和多功能特性的纳米复合材料，这些特性包括高模量、显著的强度和韧性，以及阻燃性和低透氧率（OTR）。蒙脱石（MTM）和纳米原纤化纤维素（NFC）水胶体与壳聚糖（CS）溶液相结合，通过使用先前开发的造纸方法形成高MTM含量的纳米纸结构。壳聚糖用作絮凝剂，与MTM-NFC粘土纳米纸相比，脱水时间减少到不到10%。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和傅里叶变换红外（FTIR）光谱研究了壳聚糖对粘土纳米纸结构的影响。通过单轴拉伸试验、热重分析（TGA）、OTR和吸湿实验测量性能。确认了类似珍珠层的多层结构，并且壳聚糖-粘土纳米纸在高达44-48wt%的粘土含量下表现出良好的机械性能。
