Antistatic coating and electromagnetic shielding properties of a hybrid material based on polyaniline/organoclay nanocomposite and EPDM rubber

Soto-Oviedo, Mauro A.; Araújo, Olacir Alves; Faez, Roselena; Rezende, Mirabel Cerqueira; Paoli, Marco-Aurélio De

doi:10.1016/j.synthmet.2006.09.003

Cited by 199 publications

(92 citation statements)

References 40 publications

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“…Além disso, na literatura existem vários estudos comprovando que a incorporação de MMT melhora as propriedades mecânicas e térmicas de vários polímeros, através da obtenção de nanocompósitos com MMT, quando comparados com o polímero puro [22][23][24] . O interesse na obtenção de nanocompósitos de polímero condutor com MMT resulta do efeito sinérgico entre os componentes inorgânicos e orgânicos em nível molecular, permitindo alcançar propriedades que não poderiam ser atingidas a partir dos componentes individuais, tal como: o controle da condutividade elétrica e estabilidade térmica [14,[25][26][27] . Existe um grande número de trabalhos na literatura a respeito de nanocompósitos de MMT/PPy; alguns com resultados bastante promissores para aplicações em fluídos eletroreológicos, revestimento anticorrosivos e aditivos condutores, para serem incorporados em polímeros isolantes para aplicação em blindagem eletromagnética [19,20,28,29] .…”

Section: -Obtenção De Nanocompósitos Condutores De Montmorilonita/polunclassified

“…Este resultado sugere que para ambos os nanocompósitos preparados com e sem surfactante, ocorreu a interação do PPy e PPy.SDS na MMT [25,37] . Além disso, o difratograma do compósito MMT/PPy.SDS apresentou uma fraca intensidade no pico de difração (001), indicando que também ocorreu a esfoliação parcial do PPy.SDS na MMT [14] . Na Figura 3 estão ilustradas as imagens de MEV da MMT e nanocompósito: MMT/PPy e MMT/PPy.SDS.…”

Section: Ramôa S D a S Et Al -Obtenção De Nanocompósitos Condutunclassified

“…Porém, o PPy é um material frágil, apresentando baixa processabilidade (insolúvel e infusível) e estabilidade térmica [11][12][13] . Desta forma, um grande esforço tem sido conduzido para tornar o PPy processável e mais estável termicamente, entre as técnicas utilizadas para atingir estes objetivos, destacam-se: a preparação de misturas físicas do PPy com polímeros isolantes e a intercalação em materiais inorgânicos [10][11][13][14][15] .…”

Section: Introductionunclassified

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Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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Resumo: Nanocompósitos de montmorilonita/polipirrol (MMT/PPy) foram preparados a partir da polimerização in situ do pirrol na presença de argila, bentonita sódica natural, (MMT-Na + ) em solução aquosa com ou sem surfactante aniônico, dodecil sulfato de sódio (SDS), utilizando-se o cloreto de ferro (III) hexahidratado (FeCl 3 .6H 2 O), como oxidante. A estrutura e propriedades dos nanocompósitos obtidos pela polimerização in situ do pirrol na presença de SDS (MMT/PPy.SDS) e sem surfactante (MMT/PPy) foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR), difração de raios X (DRX), microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), análise termogravimétrica (TG) e método padrão quatro pontas. Os difratogramas dos nanocompósitos revelaram que o espaçamento basal d 001 da MMT (1,42 nm) foi alterado para valores maiores, indicando a intercalação do PPy na MMT para ambos os nanocompósitos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompósitos de MMT/PPy.SDS confirmaram que a presença do SDS na reação promoveu, além da intercalação, esfoliação parcial da argila. Os nanocompósitos MMT/PPy.SDS apresentaram condutividade elétrica (9,50 S/cm) maior do que o nanocompósito de MMT/PPy (4,44 S/cm). A presença da argila melhorou de forma significativa a estabilidade térmica do PPy. Palavras-chave: Polipirrol, montmorilonita, nanocompósitos, condutividade elétrica. The Preparation of Montmorillonite/polypyrrole Nanocomposites: The Effect of Surfactant Incorporation on the Structure and PropertiesAbstract: Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were prepared by the in situ polymerization of pyrrole in the presence of clay, natural sodium bentonite, (MMT-Na + ) in aqueous solutions with or without an anionic surfactant, sodium dodecyl sulfate (SDS), using Iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) as oxidant. The structure and properties of the nanocomposites obtained by the in situ polymerization of pyrrole in the presence of SDS (MMT/PPy.SDS) and without surfactant (MMT/PPy) were compared and evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis and the four-point probe method. The XRD patterns of the MMT/PPy composites shows that the d 001 spacing in MMT (1.42 nm) was changed to higher values, indicating the intercalation of PPy on MMT for both nanocomposites. The XRD pattern, SEM and TEM images of the MMT/PPy.SDS nanocomposites confirmed that the presence of SDS in the reaction medium promoted, beyond intercalation, the partial exfoliation of the clay. The MMT/PPy.SDS nanocomposites showed electrical conductivity (9.50 S/cm) higher than the MMT/PPy nanocomposites (4.44 S/cm). The presence of the clay significantly improved the thermal stability of PPy.

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Section: -Obtenção De Nanocompósitos Condutores De Montmorilonita/polunclassified

Section: Ramôa S D a S Et Al -Obtenção De Nanocompósitos Condutunclassified

Section: Introductionunclassified

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Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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“…The improvement in the T g observed in this study may arise from some of these factors. 26,27 Micro hardness Using Vickers tests, micro hardness measurements of the surfaces of PANI/ER/HHPA composites are shown in Figure 6. The hardness depends strongly on the concentration of PANI-doped BSA filler in the composites.…”

Section: Dynamic Mechanical Thermal Analysismentioning

confidence: 99%

Curing kinetics, thermomechanical and microwave behaviors of PANI-doped BSA/epoxy resin composites

Belaabed¹,

Lamouri²,

Wojkiewicz

2011

Polym J

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This work focuses on the elaboration and characterization of conducting polymer composites based on polyaniline (PANI) dispersed in an epoxy resin (ER) matrix and cured using an anhydride without a catalyst. PANI-doped benzene sulfonic acid was successfully synthesized in this manner and used as conducting filler. The effect of heating rate and PANI loading level on the curing process was investigated by differential scanning calorimetry in the dynamic mode. Furthermore, the phase structure, viscoelastic behavior and hardness of the composites were explored by dynamic mechanical thermal analysis and Vickers tests. The structure and morphology of the samples were investigated by scanning electron microscopy, which revealed behavior that varied as a function of the concentration of PANI in the composites. Dielectric properties were investigated up to 1 MHz. The electromagnetic shielding effectiveness of the composites was measured in the microwave band from 8 to 18 GHz. It was found that the electrical properties of PANI were influenced by elevated curing temperature of the ER, a variable that significantly affected the composite characteristics. In addition, the dielectric properties, curing parameters, viscoelasticites and electromagnetic behaviors of the composites were affecting by increasing the concentration of PANI filler in the matrix.

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“…Shielding of the electromagnetic radiation is the most simple, direct, and available way to protect the EMI for reducing the surrounding quantity of electromagnetic radiation, which has been studied in many literatures [2][3][4][5][6][7][8][9][10]. The principle of the electromagnetic radiation shielding is to reduce the electromagnetic energy through the absorption or reflection of the materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Data for Study on the Shielding Effect of Electromagnetic Wave

Ting¹,

Chen²

2011

ENG

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This article presents some new experimental data for study the shielding effect of electromagnetic wave. The frequencies of electromagnetic wave are mainly focused on emission of daily electrical equipments, which are normally called "low frequency electromagnetic waves". In this work, a water pump with maximum magnetic field intensity of ca. 2300 mG was applied as emission source of the electromagnetic wave. Experimental measurements used various shielding materials with the major constituent iron (Fe) in the form of plate for studying shielding effect of electromagnetic wave. The studied parameters were different thicknesses and gaps of the plate. The results show that pure iron plate has the best effect for shielding the magnetic field and its transmission ratio of magnetic field is proportional to distance between the emission source and the shielding plate. Moreover, the shielding plate close to the emission source received better protection.

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Antistatic coating and electromagnetic shielding properties of a hybrid material based on polyaniline/organoclay nanocomposite and EPDM rubber

Cited by 199 publications

References 40 publications

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Curing kinetics, thermomechanical and microwave behaviors of PANI-doped BSA/epoxy resin composites

Experimental Data for Study on the Shielding Effect of Electromagnetic Wave

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