Dielectric Properties of Cellulose/Graphene Nano-Platelet/Polypyrrole Composites

Abstract

Cellulose (Cel)/graphene nano-platelet (GNP) and/or polypyrrole (PPy) composites were ‎prepared via emulsion in combination with a sonication strategy technique, in the presence of ‎sodium dodecyl sulphate and ceric ammonium nitrate as emulsifies, with a ratio (1:1:1). ‎The resulting composites were characterized using different analytical tools such as Fourier ‎transform infrared spectroscopy, transmitting electron microscopy, and particle ‎size distribution analysis using DLS technique. The results indicated that GNP could be ‎successfully coated on cellulosic fibers in the presence of PPy as conducting polymer. Besides, ‎GNP was dispersed in cluster shape inside the cellulose fibers with a particle size of about 155 ‎d.nm, but after adsorption of PPy, the size was increased to around 429-460 d.nm. The results ‎also exhibited that the addition of GNP increases the thermal stability of the ‎cellulose/polypyrrole composite. Furthermore, dielectric properties, including dielectric constants ‎‎(e΄), dielectric losses (e˝), loss tangent (tan δ), and AC conductivity of the prepared composites, ‎were investigated over a frequency range from 42 Hz to 5 MHz. The results showed that the ‎area of the DC conductivity increasing to 104 Hz as the temperature increases.‎

Preparation of Polypyrrole/Carbon Nanotubes Composite Cotton Fabric through In Situ Polymerization and Its Conductive Property

“…In recent works, polymer conductive materials have gradually entered engineering applications and became the focus of research in materials science . Among them, polypyrrole , is a class of heterocyclic conductive polymer with excellent electrical conductivity, good environmental stability, easy manufacturing, , good biocompatibility, and easy doping . So PPy has a wide range of applications in the fields of composite conductive materials, anticorrosive coatings, biosensors, , supercapacitors, and so on.…”