In situ vitamin C reduction of graphene oxide for preparing flexible TPU nanocomposites with high dielectric permittivity and low dielectric loss
In situ vitamin C reduction of graphene oxide for preparing flexible TPU nanocomposites with high dielectric permittivity and low dielectric loss
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原位维生素C还原氧化石墨烯制备高介电常数、低介电损耗的柔性TPU纳米复合材料
DOI：
10.1016/j.polymertesting.2018.01.026
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发表时间：
2018-04
期刊：
影响因子：
5.1
通讯作者：
Huang Han-Xiong
中科院分区：
文献类型：
--
作者：
Xiao Shu-Ping;Huang Han-Xiong
采用溶剂交换法和原位还原法制备了柔性热塑性聚氨酯/还原氧化石墨烯（TPU/rGO）纳米复合片材。拉曼、傅里叶变换红外和X射线光电子能谱表明，通过维生素C成功地还原了GO，这大大增强了所得rGO层的界面极化能力。因此，TPU/rGO片材表现出比相应的TPU/GO片材高得多的介电常数（ε′）。X射线衍射图、透射电子显微镜图像和预测的rGO层厚度都表明rGO层在TPU基质中具有良好的剥离和分散性。流变测试表明，在纳米复合材料中形成的逾渗结构与0.75体积%的rGO。增强的界面极化能力和rGO层的微电容器网络的可能形成导致仅具有0.75体积% rGO的纳米复合材料样品的高ε′（在1 kHz下为151）。同时，其介电损耗在1 kHz下保持低于1，这可以归因于两个相邻rGO层之间的绝缘TPU阻挡层削弱了两个相邻rGO层之间的隧道电流。
Flexible thermoplastic polyurethane/reduced graphene oxide (TPU/rGO) nanocomposite sheets were prepared via a combination of solvent-exchange and in situ vitamin C reduction. Raman, Fourier transform infrared and X-ray photoelectron spectroscopy suggest a successful reduction of the GO by vitamin C, which largely enhances the interfacial polarization ability of the resultant rGO layers. Hence, the TPU/rGO sheets exhibit much higher dielectric permittivity (ε′) than corresponding TPU/GO sheet. X-ray diffraction patterns, transmission electron microscopy image and predicated rGO layer thickness all indicate good exfoliation and dispersion of the rGO layers in the TPU matrix. Rheological tests demonstrate that a percolation structure is formed in the nanocomposite with 0.75 vol% rGO. The enhanced interfacial polarization ability and possible formation of micro-capacitor network of the rGO layers result in highε′ (151 at 1 kHz) for the nanocomposite sample with only 0.75 vol% rGO. Meanwhile, its dielectric loss remains lower than 1 at 1 kHz, which can be attributed to weakened tunnel current between two adjacent rGO layers by the insulating TPU barriers in between.
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