Wang Cheng, Ge Xuesong, Jiang Yijun
Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Science, Qingdao 266101, China; University of Chinese Academy of Science, Beijing 100049, China.
Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Science, Qingdao 266101, China; College of Textile and Clothing, Qingdao University, Qingdao, 266101, China.
Carbohydr Polym. 2019 Oct 15;222:115026. doi: 10.1016/j.carbpol.2019.115026. Epub 2019 Jun 25.
Montmorillonite (MMT) and graphene oxide (GO), as important building block materials, are becoming hot candidates to construct biomimetic hierarchical structure materials. In this work, we fabricated integrated strong and stiff cellulosed-based nanocomposites via a simple water-solution evaporation and hot-pressing technique. It is found there are synergistic effect among the MMT, GO and carboxymethycellulose-Na (CMC-Na) under hot-pressing. Interestingly, it is also proved that there is chemical crosslinking between MMT and GO except hydrogen bonds under our experiment condition. The tensile strength and toughness of graphene oxide/montmorillonite-sodium carboxymethycellulose (GO/MMT-CMC) hybrid films reach up to 320.11 ± 12.22 MPa and 7.79 ± 1.78 MJ/m, respectively, which were about 2.37 and 4.33 times higher than that of pure nacre; In addition, the artificial composites show excellent oxygen gas barrier and flame resistance properties. When the GO content is about 1.4 wt%, the oxygen permeability of GO/MMT-CMC is 0.94 × 10 cm³·cm/cm·s·cmHg, which is 50.79% lower than that of pure CMC films. Meanwhile, the GO/MMT-CMC ternary nanopapers demonstrate excellent self-extinguishing performance which attract interest in fire-shielding coating.
蒙脱石（MMT）和氧化石墨烯（GO）作为重要的基础构建材料，正成为构建仿生层级结构材料的热门候选材料。在本工作中，我们通过简单的水溶液蒸发和热压技术制备了集成的强韧纤维素基纳米复合材料。发现在热压条件下，MMT、GO和羧甲基纤维素钠（CMC-Na）之间存在协同效应。有趣的是，在我们的实验条件下，除了氢键外，还证明了MMT和GO之间存在化学交联。氧化石墨烯/蒙脱石-羧甲基纤维素钠（GO/MMT-CMC）杂化膜的拉伸强度和韧性分别达到320.11±12.22MPa和7.79±1.78MJ/m³，分别比纯珍珠母高约2.37倍和4.33倍；此外，人工复合材料还表现出优异的氧气阻隔和阻燃性能。当GO含量约为1.4wt%时，GO/MMT-CMC的氧气透过率为0.94×10⁻¹⁰cm³·cm/cm²·s·cmHg，比纯CMC膜低50.79%。同时，GO/MMT-CMC三元纳米纸表现出优异的自熄性能，这使其在防火涂层方面具有吸引力。
