The enhancement of the oxidation resistance of carbonyl iron by polyaniline coating and consequent changes in electromagnetic properties

Abshinova, Madina A.; Kazantseva, Natalia E.; Sáha, Petr; Sapurina, Irina; Kovářová, Jana; Stejskal, Jaroslav

doi:10.1016/j.polymdegradstab.2008.07.008

Cited by 55 publications

(25 citation statements)

References 16 publications

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“…12 Among the ICPs, polyaniline (PANI) has attracted more attention because of its unique non-redox doping, excellent thermal, chemical and environmental stability, processability and tunable properties compared to other conducting polymers. 13,14 Many researchers have studied on the electromagnetic shielding behavior of PANI and its related composites. [15][16][17] Electrical conductivity and presence of bound/localized charges can supply strong polarization and relaxation effect leading to high dielectric loss in PANI structures.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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Electrospinning of conductive polymer blends offers high potential to prepare novel materials for electronical applications. The main aim of this work is to fabricate poly(vinyl alcohol) (PVA), polyaniline (PANI), and multi walled carbon nanotubes (MWNT) composites in thin film and nanofiber layer structures and then compare their microwave absorption behavior. First, optimum ratios for blending PVA, PANI, Camphorsulfonic acid (CSA) and MWNT were obtained. Then under optimized ratios, composite solutions of PVA: PANI-CSA, and PVA/PANI-CSA/ MWNT were fabricated to nanofiber layer and thin film structures. Based on scanning electron microscope (SEM) micrographs, the PVA/PANI-CSA nanofiber samples at low content of PANI-CSA presented a very uniform surface and without any beads but some beads started to develop at higher PANI-CSA content. However, the SEM analysis of the PVA/PANI-CSA/MWNT films revealed the uniform appearance for all composites. But, some aggregation and local irregularities on the surface were observed due to the presence of MWNT in the composite structure. Microwave absorption behavior was evaluated using vector network analyzers in the frequency range of 8-12 GHz (X-band) for all samples. It was observed that absorption microwave properties of PVA/PANI-CSA nanofibers improved with increasing in the loading levels of PANI-CSA in the mixture. Microwave absorption properties of the PVA/PANI-CSA/MWNT composite nanofiber absorbers have been compared with thin films at various thicknesses by measuring the relative maximum reflection loss (dB/mm) of samples. The PVA/PANI-CSA/MWNT composite nanofibers with the layer thickness of 0.1 mm presented two remarkable absorbing peaks versus one absorbing peak in nanocomposite films with similar thickness. The relative maximum reflection loss in PVA/PANI-CSA/MWNT composite nanofiber has reached -230 dB/mm at frequency of 8.6 GHz which is nearly 8 times higher than -28 dB/ mm at frequency of 8.4 GHz for PVA/PANI-CSA/MWNT film samples.

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Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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“…As can be seen, the TG curve of original CI particles is significant increase the weight above 350°C due to the oxidation of CI. The original CI increases its mass by 37.9% at 800°C, which well corresponds to the formation of Fe 3 O 4 [14]. After electroless plating Co, the mass increase is reduced, and also the temperature of obvious weight gain is postponed, thus, the oxidation proves to be restricted.…”

Section: Resultsmentioning

confidence: 81%

Enhanced microwave absorbing properties and heat resistance of carbonyl iron by electroless plating Co

Zhu

Zhou

Luo

2015

Journal of Magnetism and Magnetic Materials

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“…, because the curves were recorded under nitrogen, the oxidation of the CIP could not been found. The original CIP presents a heat flow peak at 236.15 °C, which could be attributed to the loss of its absorbed water and decomposition of unstable components . At‐CIP presents the thermally hydrolyzed peak of residual Si‐OCH 3 and Si–OH groups at 189.23 °C as Fig.…”

Section: Resultsmentioning

confidence: 92%

“…The thermal stability of CIP is a key factor for its application. CIP usually starts to oxidize at 400 °C to form FeO and Fe 3 O 4 , to lose absorbed water at 50–180 °C, and decompose its surface unstable impurities between 200 and 250 °C . In the DTA curve in Fig.…”

Section: Resultsmentioning

confidence: 98%

Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability

Huang

Wang

Yin

et al. 2016

Surf. Interface Anal.

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The surface of carbonyl iron powder (CIP) was modified in supercritical fluid with silicone polymers containing reactive Si‐OCH3 groups. Fourier‐transformed infrared spectroscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, and thermo gravimetric analysis were adopted to characterize CIP. The dispersibility of CIP in epoxy resin matrix was evaluated by castor oil absorption factor, dynamic viscosity, Mooney viscosity, and scanning electric micrograph. The electromagnetic reflectivity of the CIP‐filled epoxy resin coatings was also checked. It was confirmed that comparing with those treated at atmosphere, the supercritical treated CIP presented higher surface carbon content, higher dispersibility, higher thermal stability, and its original crystalline structure did not change greatly. Even though it experienced a high temperature and a high pressure (250 °C, 7.8 Mpa) during supercritical treatment, it was not oxidized, and its electromagnetic reflectivity did not decrease. Copyright © 2016 John Wiley & Sons, Ltd.

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The enhancement of the oxidation resistance of carbonyl iron by polyaniline coating and consequent changes in electromagnetic properties

Cited by 55 publications

References 16 publications

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Enhanced microwave absorbing properties and heat resistance of carbonyl iron by electroless plating Co

Surface modification of carbonyl iron powders with silicone polymers in supercritical fluid to get higher dispersibility and higher thermal stability

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