Thermal studies of doped polyaniline

Abell, Lynn M.; Pomfret, S.J.; Adams, P.N.; Monkman, Andrew P.

doi:10.1016/s0379-6779(97)80678-9

Cited by 41 publications

(28 citation statements)

References 4 publications

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“…This result is attributed to loss of moisture, low molecular weight oligomers, and residual solvent, and is consistent with previous reports by other groups. 15,18 The second weight loss of ϳ 40% indicated that EB films begin to degrade at 300°C and are completely decomposed at 630°C. Similar trends for weight losses associated with polyaniline (EB) films and powder have been reported, however the temperature at which the different stages of weight loss occurs are different.…”

Section: Resultsmentioning

confidence: 99%

“…One reason polyaniline is of great interest is because it has better thermal and environmental stability compared with other CPs. [15][16][17][18][19][20][21] Therefore, polyaniline is a promising material for fabricating electronic devices, such as heterojunction diodes and TFTs. 10,22 Although polyaniline was first synthesized in 1862 and has been studied as an electrically conducting polymer since the 1980s, 23,24 the performance of polyaniline-based diodes and TFTs is relatively poor when compared with other CPs.…”

Section: Introductionmentioning

confidence: 99%

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Effect of annealing on electrical conductivity and morphology of polyaniline films

Lodha

Kilbey

Ramamurthy

et al. 2001

J of Applied Polymer Sci

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ABSTRACT:We report structure-property relationships of polyaniline emeraldine base (EB) films that were produced by combining different processing steps in various sequences. The effect of annealing and doping processes on the surface structure of the films was investigated by atomic force microscopy (AFM), and the corresponding changes to the chemical structure of the EB films were monitored by Fourier transform infrared spectroscopy. AFM results indicate that after doping polyaniline (EB) films with HCl, the root mean square (rms) roughness of the surface of EB film increased ϳ 46%. When the doped films were annealed at 180°C under a nitrogen atmosphere for 3 h, the rms roughness was essentially unchanged from that of the initial, undoped films. The electrical conductivity of the films also showed a significant dependence on the processing sequence. When the doped polyaniline (EB) films were annealed, no electrical conductivity was observed. When these films were redoped, only ϳ 6% of the initial conductivity could be recovered. In another processing sequence in which the polyaniline (EB) films were first annealed and then doped, the electrical conductivity was only ϳ 12% relative to the film that was doped immediately after being cast. From this work, a strategy to reduce the surface roughness of films made from electrically conducting polyaniline (EB) is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of annealing on electrical conductivity and morphology of polyaniline films

Lodha

Kilbey

Ramamurthy

et al. 2001

J of Applied Polymer Sci

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show abstract

“…Figure 8 shows the evolution of the calculated wavenumbers of the bands of the different modes according to the angle of torsion for the polaronic form of polyaniline. According to the literature, 31 this temperature corresponds to the glass transition, T g ES-CSA-m cresol ³ 150°C, to which the polymer is heated to stretch it. However, some vibrations are influenced by the angle of torsion.…”

Section: Discussion On Secondary Doping: Influence Of the Ring Torsionmentioning

confidence: 99%

Theoretical and experimental vibrational study of emeraldine in salt form. Part II

Cochet¹,

Louarn²,

Quillard³

et al. 2000

J. Raman Spectrosc.

299

188

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“…Kim et al [31] stated that DBSA degrades at 2508C, showing that PANI(DBSA) is not a simple mixture, but that a complex formation had occurred. Another study [32] reported that in thermograms of polyaniline doped with camphorsulfonic acid (CSA), the onset of weight loss related to the thermal decomposition of the complex was at 1508C, with a loss of 25 wt% at 2508C. The high thermal stability of CPMCB when compared with polyaniline or polypyrrole is attributed in the literature [19,20,25] to p-p interactions formed between the aromatic rings of carbon black, the main chain of the conducting polymer and the planar aromatic rings of the dopant ion.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Elastomeric composites based on ethylene–propylene–diene monomer rubber and conducting polymer‐modified carbon black

et al. 2008

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Thermally stable elastomeric composites based on ethylene-propylene-diene monomer (EPDM) and conducting polymer-modified carbon black (CPMCB) additives were produced by casting and crosslinked by compression molding. CPMCB represent a novel thermally stable conductive compound made via ''in situ'' deposition of intrinsically conducting polymers (ICP) such as polyaniline or polypyrrole on carbon black particles. Thermogravimetric analysis showed that the composites are thermally stable with no appreciable degradation at ca. 3008C. Incorporating CPMCB has been found to be advantageous to the processing of composites, as the presence of ICP lead to a better distribution of the filler within the rubber matrix, as confirmed by morphological analysis. These materials have a percolation threshold range of 5-10 phr depending on the formulation and electrical dc conductivity values in the range of 1 3 10 23 to 1 3 10 22 S cm 21 above the percolation threshold. A less pronounced reinforcing effect was observed in composites produced with ICP-modified additives in relation to those produced only with carbon black. The results obtained in this study show the feasibility of this method for producing stable, electrically conducting composites with elastomeric characteristics.

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Thermal studies of doped polyaniline

Cited by 41 publications

References 4 publications

Effect of annealing on electrical conductivity and morphology of polyaniline films

Effect of annealing on electrical conductivity and morphology of polyaniline films

Theoretical and experimental vibrational study of emeraldine in salt form. Part II

Elastomeric composites based on ethylene–propylene–diene monomer rubber and conducting polymer‐modified carbon black

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