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1
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Synthesis and characterization of polyaniline-polyvinyl chloride blends doped with sulfamic acid in aqueous tetrahydrofuran

100%
Ameen S., Ali V., Zulfequar M., Mazharul Haq M., Husain M.
Open Chemistry
|
2006
|
vol. 4
|
issue 4
565-577
EN
The temperature dependence of direct current (dc) conductivity was studied for various samples of polyaniline-polyvinylchloride (PANI-PVC) blended films. Polyaniline was doped with different concentrations of sulfamic acid in aqueous tetrahydrofuran (THF) and the blended films were prepared by varying the amount of doped PANI relative to a fixed amount of PVC. The dc conductivity of PANI-PVC blended films was measured to determine the effect of sulfamic acid (dopant) in the temperature range (300–400K). The mechanism of conduction is explained by a two-phase model. In order to evaluate the effect of the dopant, conductivity-derived parameters such as the pre-exponential factor (σ o) and the activation energy (ΔE) were calculated. The structural changes of polyaniline-PVC blended films were characterized by FTIR spectroscopy that explores information about the suitability of the dopant in the chemical doping process.
2
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Composition-induced phase transition in a [Ag2HgI4:0.2AgI] mixed composite system doped with CuI

88%
Noorussaba, Ahmad A.
Open Chemistry
|
2010
|
vol. 8
|
issue 6
1227-1235
EN
A novel composite superionic system, [Ag2HgI4:0.2AgI]:xCuI, (x = 0.2, 0.4, 0.6 mol. wt.%), was prepared and [Ag2HgI4:0.2AgI] mixed system was used as the host. Electrical conductivity was measured to study the transition behavior at frequencies of 100 Hz, 120 Hz, 1 kHz, and 10 kHz in the temperature range 90°–170°C by a Gen Rad 1659 RLC Digibridge. Sharp increase in conductivity was observed for β-α phase transitions. As a result of increase in the dopant-to-host ratio, the conductivity of the system exhibited Arrhenius (thermally activated)-type behavior. X-ray powder diffraction, differential scanning calorimetry (DSC), differential thermal analysis (DTA) and thermo-gravimetric analysis (TGA) studies confirmed the doping effect on the transition in the host, the phase transition temperature increased with an increase in the dopant concentration. Activation energies for the system in eV both for the pretransition and post-transition phase transformations are reported. The addition of CuI to [Ag2HgI4:0.2AgI] shifted the phase transition of the host [Ag2HgI4:0.2AgI], due to an interaction between [Ag2HgI4:0.2AgI] and CuI.
3
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The Influence of Mg Additive on the Structure and Electrical Conductivity of Pure Copper Castings

75%
Kranc M., Garbacz-Klempka A., Górny M., Sikora G.
Archives of Foundry Engineering
|
2017
|
vol. 17
|
issue 4
4
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Physical Properties of Copper Based MMC Strengthened with Alumina

75%
Kaczmar J. W., Granat K., Kurzawa A., Grodzka E.
Archives of Foundry Engineering
|
2014
|
issue 2
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