Spectroscopic, transport, and morphological studies of polyaniline doped with inorganic acids

Kulkarni, Milind V.; Viswanath, Annamraju Kasi; Marimuthu, R.; Seth, Tanay

doi:10.1002/pen.20167

Cited by 110 publications

(65 citation statements)

References 20 publications

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“…The protonated PANI shows strong peaks at 1567 and 1489 cm´1 corresponding to the stretching vibration of the quinonoid and benzenoid rings, and the peaks at 1301 and 1203 cm´1 can be assigned to C-N and C=N stretching vibrations respectively, which are coincident with the literature [24]. In presence of ASPB, PSS, CSPB and SiO 2 , no new peaks appear, indicating that the dopant ions have no effect on the structure of PANI chains.…”

Section: Structural Analysis-ftir Spectrasupporting

confidence: 67%

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Na¹

2015

Polymers

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Abstract:The synthesis procedure and dopant are crucial to the electrical conductivity, thermal stability, and solubility properties of polyaniline (PANI). In this paper, high-performance PANI was synthesized by means of chemical oxidative polymerization using anionic spherical polyelectrolyte brushes (ASPB) as dopant.The bonding structure, crystallographic structure, morphology, and thermal stability of the conductive nanocomposite were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermo-gravimetric analysis (TGA) respectively. Meanwhile, investigation on the electrical conductivity suggested that the room-temperature electrical conductivity of PANI doped with ASPB (PANI/ASPB) was 19.3 S/cm, which was higher than that of PANI (7.0 S/cm), PANI doped with poly(sodium-p-styrenesulfonate) (PSS) (PANI/PSS) (14.6 S/cm), PANI doped with SiO 2 (PANI/SiO 2 ) (18.2 S/cm), and PANI doped with canonic spherical polyelectrolyte brushes (CSPB) (PANI/CSPB) (8.0 S/cm). Meanwhile, the addition of ASPB improved the thermal stability and solubility properties of PANI. ASPB played the role of template. Conductive mechanism of PANI/ASPB nanocomposite can be explained by the theoretical models of three-dimensional variable range-hopping (3D VRH).

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Section: Structural Analysis-ftir Spectrasupporting

confidence: 67%

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Na¹

2015

Polymers

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“…C-C aromatic ring stretching of the benzenoid diamine unit appears at 1526 cm -1 and secondary aromatic amino group C-N stretching vibrations are shown at 1355 cm -1 . Each one of these bands is shifted approximately 60 cm -1 to higher wavenumber when compared to previous data obtained from HCl doped PANI by conventional FTIR method [28,29]. However, the presence of ~1600 and 1500 cm -1 bands implies the presence of amine and imine units in the molecular structure of PANF-HCl.…”

Section: Resultscontrasting

confidence: 46%

Polyaniline nanofibers as a new gamma radiation stabilizer agent for PMMA

Araújo¹,

Santos²,

Araújo³

2007

Express Polym. Lett.

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Abstract. Polyanilines are reported to exhibit stabilizing effects in rubber mixtures submitted to gamma-irradiation and thermo-oxidative treatment. Such abilities may be explained by their action as radical scavengers. Since radical formation followed by main chain scission is a widely accepted mechanism for radiolytic degradation of PMMA, polyaniline is a promising additive for commercial plastics submitted to radiosterilization processing. In this work, we investigated the ability of polyaniline emeraldine salt nanofibers (PANF-HCl) in preventing radiation damage on PMMA matrix. Effects of gamma-irradiation on PMMA/PANF-HCl composites films were assessed by comparison of the variation of viscosityaverage molar mass (Mv) of PMMA at 25 kGy dose when compared to commercial PMMA films. Samples containing 0.15% PANF-HCl (wt/wt) retained 92% of the initial Mv after irradiation while control sample presented 42% of Mv retention. When exposed to 60-200 kGy doses, PANF-HCl embedded into PMMA matrix preserved their oxidation state but started to exhibit mild deprotonation. PANF-HCl nanofibers were characterized by Diffuse Reflection Infrared Fourier Transform Spectroscopy (DRIFTS) and Scanning Electronic Microscopy (SEM). PMMA/PANF-HCl composites films were characterized by SEM and UV-VIS spectroscopy.

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“…34,35 The peak at 809 cm −1 is attributed to the out of plane deformation of C-H in the p-disubstituted benzene ring. 35,36 The FTIR spectrum for Y 2 O 3 shown in Figure 2(b), the high intensity peaks centered around 600 cm Figure 3 (a, b and c). The micrograph of pristine PAni shown in Figure 3(a) indicates the agglomerated globular structure.…”

Section: Methodsmentioning

confidence: 99%

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

Faisal¹,

Khasim²

2013

Bulletin of the Korean Chemical Society

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Polyaniline-yttrium trioxide (PAni-Y 2 O 3 ) composites were synthesized by the in-situ polymerization of aniline in the presence of Y 2 O 3 . The composite formation and structural changes in these composites were investigated by X-ray diffraction (XRD), Fourier transform infra red spectroscopy (FTIR), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The direct current (DC) electrical conductivity of the order of 0.51 × 10 −2 S cm −1 -0.283 S cm −1 in the temperature range 300 K-473 K indicates semiconducting behavior of the composites. Room temperature AC conductivity and dielectric response of the composites were studied in the frequency range of 10 Hz to 1 MHz. The variation of AC conductivity with frequency obeyed the power law, which decreased with increasing weight percentage (wt %) of Y 2 O 3 . Studies on dielectric properties shows the relaxation contribution coupled by electrode polarization effect. The dielectric constant and dielectric loss in these composites depend on the content of Y 2 O 3 with a percolation threshold at 20 wt % of Y 2 O 3 in PAni. Electromagnetic interference shielding effectiveness (EMI SE) of the composites in the frequency range 100 Hz to 2 GHz was in the practically useful range of -12.2 dB to -17.2 dB. The observed electrical and shielding properties were attributed to the interaction of Y 2 O 3 particles with the PAni molecular chains.

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Spectroscopic, transport, and morphological studies of polyaniline doped with inorganic acids

Cited by 110 publications

References 20 publications

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Polyaniline nanofibers as a new gamma radiation stabilizer agent for PMMA

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

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