剪切场诱导下高度取向氧化石墨烯纳米片填充的超低透气纤维素纳米纤维纳米复合薄膜。
Ultra-low gas permeable cellulose nanofiber nanocomposite films filled with highly oriented graphene oxide nanosheets induced by shear field.
机构信息
The Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, 710048, China.
The Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, 710048, China; College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.
出版信息
Carbohydr Polym. 2019 Apr 1;209:310-319. doi: 10.1016/j.carbpol.2019.01.040. Epub 2019 Jan 14.
Graphene oxide nanosheet/cellulose nanofiber (GONS/CNF) nanocomposite films with ultra-low gas permeable property were fabricated through layer-by-layer coating and hot pressing method. XRD results showed that GONS was completely exfoliated and well dispersed in CNF matrix. The images of SEM and GI-WAXS manifested that the exfoliated GONS was highly oriented along the film direction under a strong external shear flow field. Such unique structure endows GONS/CNF nanocomposites with ultrahigh oxygen barrier property and good water vapor barrier performance. With only 3.66 vol% GONS, the oxygen permeability coefficient of CNF film decreased by about 4 × 10 times, from 5.5 × 10 to 1.4 × 10 cm cm·cm s Pa. Meanwhile, the tensile strength and Young's modulus of the CNF film were respectively enhanced by 2 and 57 times. Furthermore, the thermal stability of CNF film was also improved with the incorporation of GONS.
通过层层涂层和热压方法制备了具有超低透气性能的氧化石墨烯纳米片/纤维素纳米纤维（GONS/CNF）纳米复合膜。XRD 结果表明，GONS 完全剥离并均匀分散在 CNF 基体中。SEM 和 GI-WAXS 的图像表明，在强外部剪切流场的作用下，剥离的 GONS 沿膜方向高度取向。这种独特的结构赋予 GONS/CNF 纳米复合材料超高的氧气阻隔性能和良好的水蒸气阻隔性能。仅添加 3.66vol%的 GONS，纤维素纳米纤维膜的氧气透过系数就降低了约 4 倍，从 5.5×10 降低到 1.4×10 cm cm·cm s Pa。同时，纤维素纳米纤维膜的拉伸强度和杨氏模量分别提高了 2 倍和 57 倍。此外，GONS 的加入还提高了纤维素纳米纤维膜的热稳定性。
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