Effect of temperature on the electrical conductivity of polyaniline/cashew gum blends

The electrical properties of polymeric films/blends comprising polyaniline (PANI) and cashew gum (CG) blends were studied by impedance spectroscopy in the temperature range from 300 K to 353 K. Protonation promoted by sulfuric acid was responsible for changing the oxidation state from undoped emeral...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-10, Vol.253, p.123383, Article 123383
Main Authors: Amorim, Daniel R.B., da Silva Guimarães, Iran, Fugikawa-Santos, Lucas, Vega, Maria L., da Cunha, Helder N.
Format: Article
Language:English
Subjects:
Cashew gum
Conductivity
Doped films
Electrical properties
Electrical resistivity
Equivalent circuits
Gums
Oxidation
Polyaniline
Polyanilines
Polymer blends
Polymer films
Protonation
Sulfuric acid
Temperature effects
Thermal effect
Valence
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Summary:The electrical properties of polymeric films/blends comprising polyaniline (PANI) and cashew gum (CG) blends were studied by impedance spectroscopy in the temperature range from 300 K to 353 K. Protonation promoted by sulfuric acid was responsible for changing the oxidation state from undoped emeraldine base (EB) to doped emeraldine salt (ES). The low-frequency conductivity of the films varied more than 6 orders of magnitude by doping. In (PANI- EB)/CG blends, the presence of cashew gum acts a dispersing agent, lowering the electrical conductivity contrasting to (PANI-ES)/CG blends, where the electrical conductivity increases with CG concentration up to 20% (w/w). Moreover, undoped films presented a thermally-activated electrical conductivity, whereas doped films presented a decrease in the conductivity by increasing temperature. An equivalent circuit model is proposed to analyze the data by considering the system being composed of highly conductive regions separated by insulating/semiconducting ones. [Display omitted] •A blend comprising Polyaniline (PANI) and cashew gum cultivated in Brazil shows electrical interesting behavior.•The blends show insulating behavior in undoped state and metallic character when they are protonated via sulfuric acid.•In the doped samples, the conductivity of blends is higher than the conductivity of pure PANI.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.123383