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Scheme 1 Mechanism of synthesis of conducting polyaniline using hydrogen peroxide and Fe 2? as oxidant and catalyst, respectively
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Polymerizations of aniline at the reaction temperatures of 25 and 50 °C have been performed in the presence of iron catalyst. The prepared conducting polyaniline at different reaction periods was investigated for physicochemical and electrical properties, through X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–Visible spectroscopy (...
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Context 1
... orientations of conducting polymer are of much interest because highly ordered systems displayed a unique property like conductivity. XRD results of PANI synthesized at various reaction periods such as 5, 18 and 24 h at the reaction temperatures 25 and 50 °C are depicted in Fig. 1. The reaction time and color changes of the polymerization reaction were carefully recorded and found that the polymerization of aniline was fully completed at the reaction time of 24 h. From the Fig. 1 (patterns a, b, and c), it is clear that the intensities of the various peaks are slowly increased with increase in reaction time and ...Context 2
... XRD results of PANI synthesized at various reaction periods such as 5, 18 and 24 h at the reaction temperatures 25 and 50 °C are depicted in Fig. 1. The reaction time and color changes of the polymerization reaction were carefully recorded and found that the polymerization of aniline was fully completed at the reaction time of 24 h. From the Fig. 1 (patterns a, b, and c), it is clear that the intensities of the various peaks are slowly increased with increase in reaction time and the characteristics broad peaks are observed at the reaction time of 24 h, since the time needed to consume H 2 O 2 in part on polymerization of aniline and in part on self decomposition by the redox system such as Fe ...Context 3
... 24 h, since the time needed to consume H 2 O 2 in part on polymerization of aniline and in part on self decomposition by the redox system such as Fe 2? . The diffraction pattern of PANI synthesized at reaction time of 24 h shows a characteristic broad peak at 13.90° and reveals the completion of polymerization process. It is also evident from the Fig. 1 (pattern c) that the PANI has few small peaks riding over a broad hump indicating that chain ordering is predominantly limited to short range. It is further observed that PANI has partially crystalline and amorphous state in its network [20] owing to the local strain created and the peak broadening is the origin of the nano-dimensional state. ...Similar publications
Thermoplastic polyurethane/polyaniline-based stretchable strain sensors were prepared via in situ polymerization of aniline in the TPU solution in the form of thin films. The sensors where characterized for morphological and thermal properties, mechanical hysteresis and cyclic piezoelectric performance. Thermogravimetric analysis showed blends to b...
Citations
... During the off pulse growth on the initial sites of the electrode is frustrated and hence the growth on the fresh sites of the electrode is more probable leading to a large number of equivalent nucleation and growth sites. Pulse galvanostatic electrosynthesis is a reliable method in controlling the morphology of the samples [13][14][15][16][17][18]. ...
The primary aim of the research reported in this paper is to study the influence of the type of dopant, used in the synthesis of polyaniline, on the physico-mechanical and electrical properties of polyaniline filled composites. Polyaniline (PAni) doped with four different dopants was used as a filler in the interpenetrating polymer networks (IPNs) of polymethyl methacrylate (PMMA) and polyurethane (PU). The dopants used in the synthesis of PAni included inorganic dopants (hydrochloric acid (HCl), sulphuric acid (H2SO4)) and organic dopants (p-Toluenesulfonic acid (PTSA), camphor sulphonic acid (CSA)). Physico-mechanical properties of the filled-IPNs, tensile strength, hardness, elongation at break and Young's modulus were determined along with electrical conductivity. Chemical resistance of the IPNs against different acids and bases was also determined. It was observed that the properties of PAni filled PU/PMMA IPNs were a strong function of the type of dopant used in the synthesis of PAni.
Conjugated polymer/nanodiamond nanocomposites have been known as high-performance materials due to improved physical properties relative to conventional composites. In this attempt, novel conjugated polymer/nanodiamond nanocomposites were successfully prepared by in situ oxidative polymerization. Physical characteristics of the resultant nanocomposites were explored using Fourier transform infrared spectroscopy, field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscope, differential scanning calorimeter, thermogravimetric analysis and X-ray diffraction spectroscopy. Structural analysis revealed the oxidative polymerization of various matrices [polyaniline (PANi), polypyrrole (PPy), polythiophene (PTh) and polyazopyridine (PAP)] over the surface of functionalized (F-NDs) and non-functionalized nanodiamonds (NF-NDs) thus ensuing NF-NDs/PAP/PANi/PPy, F-NDs/PAP/PANi/PPy, NF-NDs/PANi/PPy/PTh and F-NDs/PANi/PPy/PTh nanocomposites. FESEM images depicted the fibrillar morphology of resulting nanocomposites with granular arrangement of nanofiller in matrix. Thermal analysis results showed that the functionalized F-NDs/PAP/PANi/PPy hybrid had higher value of 10 % weight loss around 489 °C relative to F-NDs/PANi/PPy/PTh with T10 at 471 °C. The glass transition temperature was found to be 99 and 105 °C for NF-NDs/PANi/PPy/PTh and F-NDs/PANi/PPy/PTh, respectively. On the other hand, NF-NDS/PAP/PANi/PPy and F-NDs/PAP/PANi/PPy showed higher T
g’s of 109 and 118 °C. The conductivity of NF-NDs/PAP/PANi/PPy was 3.8 Scm−1 and improved with the functionalized filler loading in F-NDs/PAP/PANi/PPy up to 5.4 Scm−1, while NF-NDs/PANi/PPy/PTh and F-NDs/PANi/PPy/PTh had relatively lower values around 2.9 and 3.7 Scm−1, respectively. New conducting nanocomposites may act as useful contenders in significant industrial applications such as polymer Li-ion battery.
