Xu Ling, Teng Jian, Li Lei, Huang Hua-Dong, Xu Jia-Zhuang, Li Yue, Ren Peng-Gang, Zhong Gan-Ji, Li Zhong-Ming
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People's Republic of China.
Institute of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, Shaanxi 710048, China.
ACS Omega. 2019 Jan 8;4(1):509-517. doi: 10.1021/acsomega.8b02866. eCollection 2019 Jan 31.
Regenerated cellulose (RC) films exhibit poor water barrier performance, which seriously restricts its applications. To address this issue, an impermeable and hydrophobic graphene oxide modified by chemically grafting octadecylamine (GO-ODA) was utilized to enhance the water vapor barrier performance of RC nanocomposite films. Compared to the neat RC film, more than 20% decrease in the coefficient of water vapor permeability ( ) was achieved by loading only 2.0 wt % GO-ODA. The promising hydrophobicity of GO-ODA effectively retarded the formation of hydrogen bonding at the relatively weakened interface between GO and RC, compensating for the diffusion of water vapor molecules at the interface; on the other hand, the fully exfoliated GO-ODA nanosheets were inclined to align with the surface of the as-prepared RC nanocomposite films during hot-pressure drying, creating a much more tortuous pathway for diffusion of water molecules. The new insights could be valuable for widening application of cellulose such as packaging.
再生纤维素（RC）薄膜的阻水性能较差，这严重限制了其应用。为了解决这个问题，通过化学接枝十八烷基胺修饰的不可渗透且疏水的氧化石墨烯（GO-ODA）被用于提高RC纳米复合薄膜的水蒸气阻隔性能。与纯RC薄膜相比，仅添加2.0 wt%的GO-ODA就能使水蒸气透过系数降低20%以上。GO-ODA具有良好的疏水性，有效地抑制了GO与RC之间相对较弱界面处氢键的形成，弥补了界面处水蒸气分子的扩散；另一方面，在热压干燥过程中，完全剥离的GO-ODA纳米片倾向于与制备好的RC纳米复合薄膜表面对齐，为水分子的扩散创造了一条更加曲折的路径。这些新见解对于拓宽纤维素在包装等方面的应用具有重要价值。
