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Anisotropic nanocomposite films of hydroxypropylcellulose and graphene oxide with multi-responsiveness

机译：羟丙基纤维素的各向异性纳米复合薄膜和具有多反应性的石墨烯氧化物

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Anisotropic nanocomposite films of hydroxypropylcellulose (HPC) and graphene oxide (GO) were fabricated by blade-coating of the aqueous mixture to align the substance and subsequent solvent evaporation to freeze the oriented structure. Owing to the anisotropic structure, the composite films showed anisotropic mechanical properties and response to external stimuli. The influences of GO content, stretch rate, and relative humidity on the anisotropic structure and mechanical properties of the films were investigated. The incorporation of GO did not destroy the anisotropic structure of the HPC film, but improved the mechanical properties to some extent and favoured the bending deformation and locomotion of the composite film under the humidity gradient. These behaviours were associated with the large aspect ratio and excellent gas barrier property of GO nanosheets that favoured suppressing the slippage of HPC chains and enhanced the differential volume change at the top and bottom surfaces of the film. The composite HPC film with GO or reduced GO also responded to near-infrared light due to the photothermal effect and the variation of HPC matrix at a high temperature. This facile strategy should be applicable to other natural or synthetic polymers to fabricate anisotropic composite films with potential applications as optical devices, sensors, and actuators.
机译：羟丙基纤维素（HPC）和氧化石墨烯（GO）的各向异性纳米复合膜通过叶片的涂层中的水性混合物的对准物质和随后的溶剂蒸发以冻结定向结构制造。由于各向异性结构，该复合膜表现出各向异性的机械性能和响应于外部刺激。 GO含量，拉伸率，以及在各向异性结构和膜的机械性能相对湿度的影响进行了研究。 GO的并入不破坏HPC膜的各向异性的结构，但改进的机械性能在一定程度上和湿度梯度下青睐复合膜的弯曲变形和运动。这些行为用的大的纵横比和GO纳米片一种有利于抑制HPC链的顶部和该膜的下表面的滑动，提高了微分容积变化的优异的气体阻隔性相关联。与GO或降低的GO复合HPC薄膜还响应近红外光，由于光热效应和HPC矩阵的在高温下的变化。此容易战略应适用于其它天然或合成的聚合物制造具有潜在的应用如光学器件，传感器，和致动器的各向异性的复合薄膜。

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    《RSC Advances》 |2019年第49期|共10页
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  • 正文语种 eng
  • 中图分类 化学;
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