Enhanced dielectric properties of polymer composite films induced by encapsulated MWCNTs with a one core‐two shell structure

Abstract

Multiwalled carbon nanotubes (MWCNTs) can endow high dielectric constant to polymer-based composites. However, the accompanying poor dispersion of MWCNTs and high dielectric loss for composites severely limit their application in dielectric field. Herein, a modified acid-treated MWCNTs encapsulated by the polyaniline/poly(sodium 4-styrenesulfonate) layers (aMWCNTs@PANI-PSS) with a one core-two shell structure was fabricated by in situ polymerization followed by electrostatic self-assembly technique. Furthermore, the composite films based on aMWCNTs@PANI-PSS/poly(vinylidenefluoridehexaflouropropylene) (PVDF-HFP) were fabricated by a solutioncasting method. An ultrathin insulating PSS shell is wrapped onto aMWCNTs@PANI, resulting in the improvement of dispersibility for aMWCNTs@PANI and the decrease of dielectric loss for composite films. When the content of aMWCNT-s@PANI-PSS is 5.0 wt %, the dielectric constant of aMWCNT-s@PANI-PSS/PVDF-HFP reaches 430 (100 Hz), which is about 55 times of pure PVDF-HFP and 1.7 times of aMWCNTs@PANI/ PVDF-HFP (247). Besides, the responding dielectric loss of aMWCNTs@PANI-PSS/PVDF-HFP composite film is only 0.67, much lower than that of aMWCNTs@PANI/PVDF-HFP (25) and aMWCNTs/PVDF-HFP (3185). V C 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 948-956

Combined effect of modified titanium carbide (TiC) particles and ethylene alpha olefins (POE) on properties of ethylene propylene diene monomer (EPDM)/TiC/POE composites for electronic application

“…It is also observed that NDZ105 absorbs at 2917cm -1 and 2850 cm -1 , assigned to asymmetric stretching vibration of methylene and symmetric stretching vibration of methylene, respectively. [24,26] The absorption peaks around 2917cm -1 and 2850 cm -1 in the spectrum of modified TiC, suggest the adherence of NDZ105 to the surface of TiC particles. [20,27] (Scheme 1) ( Fig.…”

Facile preparation and properties of polyvinylidene fluoride dielectric nanocomposites via phase morphology control and incorporation of multiwalled carbon nanotubes conductive fillers

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