کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7825384 | 1502924 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
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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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 (εâ²) 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 0.75â¯vol% rGO. The enhanced interfacial polarization ability and possible formation of micro-capacitor network of the rGO layers result in high εⲠ(151â¯at 1â¯kHz) for the nanocomposite sample with only 0.75â¯vol% rGO. Meanwhile, its dielectric loss remains lower than 1â¯at 1â¯kHz, which can be attributed to weakened tunnel current between two adjacent rGO layers by the insulating TPU barriers in between.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 66, April 2018, Pages 334-341
Journal: Polymer Testing - Volume 66, April 2018, Pages 334-341
نویسندگان
Shu-Ping Xiao, Han-Xiong Huang,