Electromagnetic shielding properties of polypyrrole/polyester composites in the 1–18GHz frequency range

Håkansson, Eva; Amiet, Andrew; Kaynak, Akif

doi:10.1016/j.synthmet.2006.05.010

Cited by 138 publications

(89 citation statements)

References 61 publications

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“…Regardless of some processing problems, this polymer has already found numerous applications in different fields. Among the others, it should be mentioned such technologies like electromagnetic shielding [4], conductive coatings [5], corrosion protection [6], artificial muscles [7], light-emitting diodes [8], field-effect transistors [9], photovoltaic cells [10] and sensors [11]. Polyaniline also can be used as an efficient catalyst in chemical technology, or as a catalyst substrate [12].…”

Section: Introductionmentioning

confidence: 99%

Alternative oxidizers in polyaniline synthesis

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Alternative oxidizers in polyaniline synthesis

et al. 2010

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“…In [45], the dielectric characteristics of conducting polymer-coated textiles in the frequency range 1-18 GHz were investigated. Polypyrrole coatings were applied by solution polymerization on fabric substrates using a range of concentrations of paratoluene-2-sulfonic acid (pTSA) as dopant and ferric chloride as oxidant.…”

Section: Ppy/polyester Textilesmentioning

confidence: 99%

Applications of Polypyrrole/Polyester Textiles: A Review

Sparavigna¹

2017

ijSciences

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Abstract:The polypyrrole, in its intrinsically conducting form, can be used to prepare composites such as polypyrrole/polyester textiles by coating yarns or fabrics made of polyester. In this manner, we obtain textiles that can be involved in several applications, among which we find the use of textiles in electromagnetic shielding. However, several other uses of polypyrrole/polyester composites are possible, such as in biomedical applications. Here we propose a survey of the literature about these composites. Keywords: Textiles, Polypyrrole, Intrinsically Conducting Polymers, Electromagnetic shielding IntroductionWhen opportunely processed, the polypyrrole becomes an intrinsically conducting polymer. This material can be used to prepare polypyrrole/polyester textile composites, by coating yarns or fabrics made of polyester. In this manner we obtain textiles that can be used for several applications. Two of them are the electromagnetic interference (EMI) shielding and the radiation-absorbent camouflage [1][2][3][4][5]. Materials for EMI shielding are needed due to the interference of radio frequency and microwave devices with computers, transformers, cables, mobile phones, medical devices, and also for the effect of the radiation on human health. Applications of textiles is therefore required for the shielding of persons, devices or large volumes such as those of an entire room. In the case that textiles are applied as radiation-absorbent materials they can be used in stealth technology, to disguise devices or structures from radar detection. Other applications of the polypyrrole/polyester fibres and fabrics are possible, in particular in the biomedical area.

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“…The dielectric relaxation frequency depends on the ferroelectric domain size and typically lies in the range 100 MHz to 10 GHz [9]. A relaxation frequency near 1 GHz has 15 been experimentally demonstrated for BT with different domain sizes, where for instance the dielectric constant for samples with micrometer sized domains dropped from 1900 at 10 kHz to 280 at 5.6 GHz [1]. It is expected that this frequency-dependent dielectric performance of BT will also be observed in polymer/BT composite materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

Qin

Dancer

Grovenor

et al. 2016

Composites Science and Technology

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Frequency dependence of the dielectric properties of polymer-ferroelectric composites at different bands of microwave frequencies was investigated in this work.Perfluoroalkoxy (PFA) / barium titanate (BaTiO 3 ) nanocomposite films were prepared by spray deposition. The spraying process was scaled up to fabricate large area (max. 160 mm x 160 mm) uniform composite sheets out of which a controlled bonding process was introduced to form composite blocks.The microstructure of the composite films was examined by SEM with a microtome sample preparation method to evaluate the effectiveness of the spraying process at producing uniform particle distributions. The dielectric properties of the composite films with various BaTiO 3 loadings were characterised by an Impedance Analyzer at frequencies between 10 Hz and 1 MHz and Vector Network Analyzer at 12 -18 GHz respectively. The Lichtenecker mixing rule was incorporated to fit the measured dielectric constant data, which gives estimates of dielectric constant of the BaTiO 3 nanometer sized particles to be 895 and 571 at 10 kHz and 15 GHz respectively. In comparison, the composite effective dielectric constant was approximately reduced by 25% at 10 kHz than that at 15 GHz.

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Electromagnetic shielding properties of polypyrrole/polyester composites in the 1–18GHz frequency range

Cited by 138 publications

References 61 publications

Alternative oxidizers in polyaniline synthesis

Alternative oxidizers in polyaniline synthesis

Applications of Polypyrrole/Polyester Textiles: A Review

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

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