The effect of low concentrations of polypyrrole on the structural, thermal, and dielectric characteristics of CMC/PPy blends

Abstract

The current work aims to synthesize carboxymethyl cellulose/polypyrrole (CMC/PPy) blends with different PPy concentrations as promising blends for energy storage devices with low cost and excellent chemical and physical characteristics. The structural and dielectric characteristics of CMC/PPy blends were studied. FT-IR spectroscopy is utilized to study the structural properties of the present blends, whereas the dielectric properties are explored at frequency range of 0.1 Hz−20 MHz. The structural study of CMC/PPy blends showed good homogeneity between the CMC matrix and PPy as a conductive filler. The thermal behavior of the present blends was also investigated using DSC, where the thermal stability of the blends was improved after incorporating PPy into the host matrix. The dielectric characteristics results indicated a rise in the dielectric parameters of CMC with an increase in the PPy content up to 8 wt%. The dielectric parameters of CMC/PPy blends are frequency dependents. The dielectric constant (ε′) and AC electrical conductivity of the blends under study enhanced by about 33% with a rise in the PPy content to 8 wt%. The dielectric loss (ε″) values decreased from 3.4938 to 0.93071 at 10 kHz; this performance means that the CMC/PPy blends have an excellent possibility for energy storage devices with low dielectric loss in various applications, such as sensors, batteries, and capacitors.

Improved electrochemical performance of bio-derived plasticized starch/ reduced graphene oxide/ molybdenum disulfide ternary nanocomposite for flexible energy storage applications

“…For the PS/rGO, the C–O–C peak at 837 cm −1 diminished. This is attributed to the fact that in the vicinity of the starch granule, parts of its carbon ring bonds were removed, and oxygen groups were substituted by hydroxyl groups 13 , 35 . In the FTIR spectra, three new peaks at 1522 cm −1 , 2017 cm −1 , and 3682 cm −1 have been found due to the addition of rGO, which corresponds to C–H bending, C=C bending, and C–H stretching, respectively.…”

“…However, starch films generally exhibit poor charge conductivity, low solubility in various electrolytes, low mechanical properties, and high-water affinity, which limit their commercial use in electronics 10 . To address these shortcomings, various approaches have been attempted, including chemical modification, blending with cellulose or starch crystals, agar, maltodextrin, xanthan, arabinoxylan, chitosan, and the addition of plasticizers (such as glycerol, sorbitol, and lignin) 11 – 13 . Some research has focused on the development of composites that incorporate fillers, such as starch/ZnO 14 , PAni-starch 15 , starch-rGO 16 , 17 , and others 18 , to enhance the specific properties.…”