Free-standing polymer/multiwalled carbon nanotubes composite thin films for high thermal conductivity and prominent EMI shielding
Colloids and Surfaces A: Physicochemical and Engineering Aspects(2023)
摘要
Lightweight composite materials with efficient thermal conductivity (TC) and high electromagnetic interference (EMI) shielding effectiveness (SE) are of paramount importance for a wide range of applications such as electronics, aerospace, and stealth technology. In this work, lightweight, flexible, and free-standing poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/multiwalled carbon nanotube (MWCNT) composite thin films are fabricated by a single-step, solution casting method. Fabricated PVDF-HFP/MWCNT composite thin films are characterized by many physicochemical techniques such as Raman spectra, Fourier transform infrared spectra, Xray diffractometer, and high-resolution transmission electron microscope. The resulting composite thin film exhibits a TC of 1.1 Wm ? 1K-1 at room temperature. Further analysis shows that the TC of the composite film is increased up to 1.8 Wm- 1K-1 at 100 degrees C. As fabricated flexible , free-standing composite thin film (thickness -150 & mu;m) exhibit an excellent EMI SE of -36 dB in the X-band region (8.2-12.4 GHz) at just 15 wt. % loading of MWCNT. The outstanding EMI shielding and high TC of PVDF-HFP/MWCNT composite films are attributed to the homogenous distribution and well-connected network of MWCNT within the polymer matrix, forming a conductive network throughout the composite film.
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关键词
MWCNT,PVDF-HFP,Composite thin films,Thermal conductivity,EMI shielding
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