Elastic polyaniline with EPDM and dodecylbenzenesulfonic acid as plasticizers

Faez, Roselena; Paoli, Marco-Aurélio De

doi:10.1002/app.2019

Cited by 27 publications

(11 citation statements)

References 49 publications

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“…The doping process of PAni-EB with CSA (PAni-CSA) was carried out using two routes: (i) solution doping (stirring PAni-EB into 1.0 mol L À1 solution of CSA for 24 hr) to obtain PAni-CSA-s; and (ii) reactive processing doping (using an internal mixer chamber of a Haake rheometer 600 according to previous work) [12,18] to obtain PAni-CSA-rp. The reactive processing with CSA was performed at different temperatures (80, 90, and 1008C) at 50 rpm for 10 min.…”

Section: Doping Methodologiesmentioning

confidence: 99%

Reactive doping of PAni–CSA and its use in microwave absorbing materials

Biscaro

Rezende

Faez

2008

Polymers for Advanced Techs

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Conductive coatings have been studied for static dissipation and as microwave absorbing materials. The doping process of polyaniline (PAni), which makes it conductive, is an important stage that determines the coating performance. For this purpose, polyaniline was doped by reactive processing in a torque rheometer using different molar ratios between PAni and acid (PAni:CSA) at three different temperatures (80, 90, and 100-C). Aqueous solution doping was also used in the ratio of 1:2 of PAni/CSA, with the aim to investigate the influence of different methods of PAni doping on its characteristics and, consequently, on the performance of coatings. Thermal analyses of the processed materials showed that PAni doped by both routes, reactive and solution processing, showed similar behaviors. X-ray diffraction analyses showed a semicrystalline structure for the PAni-CSA doped by reactive processing using high CSA concentrations and temperature. It was also observed that the doping process affects the dispersion of the components into the conductive coatings. Microwave absorption measurements (8-12 GHz) of PU-doped PAni blends showed the dependence of the doping type, the PAni-CSA concentration, and the mixing conditions of the components on the coating performance; it was found up to 99% of attenuation of the incident radiation for some composites in a narrow frequency range. The microwave absorption efficiency of the coating samples prepared by using the reactive doping process indicates the advantage of this methodology over solution doping. Moreover, the reactive process addresses the environmental requirements.

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Section: Doping Methodologiesmentioning

confidence: 99%

Reactive doping of PAni–CSA and its use in microwave absorbing materials

Biscaro

Rezende

Faez

2008

Polymers for Advanced Techs

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“…The use of blends in the rubber industry is important because it allows tailoring of the characteristics of a material by using in their composition two or more polymers with different proper-ties. [6][7][8][9] Poly(ethylene-co-propylene-co-ethylidenenorbornene), EPDM rubber, was chosen in this work because of its highly saturated structure affording a material with good resistance against weathering. 10 PAni is one of the most studied conducting polymers due to its high electrical conductivity associated to good stability, facility of preparation, and low cost of the monomer.…”

Section: Introductionmentioning

confidence: 99%

Elastomer composite based on EPDM reinforced with polyaniline coated curauá fibers prepared by mechanical mixing

Araújo

Adamo

Rocha

et al. 2013

J of Applied Polymer Sci

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Curau a fibers were used to reinforce elastomeric matrices with polyaniline (PAni) synthesized directly on the fiber surfaces to produce antistatic-reinforced composites. In this work, composites of poly(ethylene-co-propylene-co-diene) with curau a fibers coated with PAni were prepared by mechanical mixing in a counter-rotating twin rotor internal mixer. Then, mechanical and electrical properties of these composites were correlated to Raman and Fourier transformed infrared spectra (FTIR) using chemometric data analyze, such as principal component analysis (PCA) and hierarchical cluster analysis (HCA). Raman spectra showed correlation with electrical properties of conductive composites while FTIR spectra showed good correlation with mechanical properties. EPDM reinforced with PAni coated curau a fibers presented higher tensile strength and modulus than EPDM reinforced with pristine curau a fibers, indicating that the reinforcement effect was obtained. Chemical interaction between the phases occurs with formation of hydrogen bonding between the aminic nitrogens of PAni and the carbonyl groups of lignin of the fibers.

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“…Encontra-se na literatura vários trabalhos onde se descreve a obtenção de compósitos de PANI com elastomeros, utilizando diferentes métodos de preparo como mistura termomecâ-nica [8,9] , "casting" [10][11][12][13] , eletroquímico e emulsão [14] . Neste trabalho, compósitos de borracha natural com polianilina foram obtidos através da polimerização da anilina por emulsão na presença de borracha natural, toluol e do ácido dodecilbenzeno sulfônico -DBSA.…”

Section: Introductionunclassified

Compósitos de borracha natural com polianilina

et al. 2007

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Resumo: Compósitos de borracha natural (Hevea brasiliensis)-BN/polianilina -PANI, com diferentes composições foram obtidos através da polimerização por emulsão do monômero anilina na presença da BN e do ácido dodecilbenzeno sulfô-nico (DBSA). Filmes finos e homogêneos foram obtidos por prensagem a quente. Os compósitos foram caracterizados por condutividade elétrica, FTIR, UV-vis-NIR, DSC e difração de raios X. Compósito com condutividade elétrica cerca de 14 ordens de grandeza maior que a BN foi obtido. Este alto valor de condutividade é atribuído à formação da PANI no estado dopado no compósito, que foi verificado através das técnicas de UV-vis-NIR e FTIR. Os resultados obtidos com a técnica de DSC e difratometria de raios X indicaram que os polímeros são imiscíveis e que a presença da borracha não altera significantemente a fase cristalina da PANI-DBSA no compósito.Palavras-chave: Polimerização por emulsão, borracha natural, polianilina. Composites of Natural Rubber with PolyanilineAbstract: In this work composites with different compositions were obtained from natural rubber (Hevea brasiliensis) (NR) and polyaniline (PANI) using the emulsion polymerization of aniline in the presence of NR and dodecylbenzenesulfonic acid (DBSA). The samples in film form were obtained by pressing the precipitate at 100 °C for 5 minutes. The composites were characterized by electrical conductivity, Fourier-transform infrared spectroscopy (FTIR), UV-vis-NIR spectroscopy, differential scanning calorimetry (DSC) and X ray diffraction. Composites with electrical conductivity about 14 orders of magnitude higher than NR were obtained. The UV-vis-NIR and FTIR spectra showed that PANI-DBSA was formed in the composites, thus making it responsible for their high conductivity. The DSC thermograms indicated that the two polymers are immiscible and X ray diffraction evidenced that NB does not considerably affect PANI-DBSA crystalline phase in the composite.Keywords: Emulsion polymerization, natural rubber, polyaniline. IntroduçãoOs polímeros intrinsecamente condutores possuem grande potencial para aplicações tecnológicas, devido principalmente a suas propriedades elétricas e óticas. Dentre esses polímeros condutores, destaca-se a polianilina-PANI devido a sua estabilidade química no estado dopado em condições ambientais e também por ser facilmente sintetizada quimicamente [1] . Entretanto, uma das limitações no uso da polianilina tem sido sua processabilidade apresentando baixa solubilidade e infusibilidade. Dentro deste contexto, blendas e compósitos com polímeros convencionais têm atraído muita atenção, uma vez que estes possibilitam a combinação das excelentes propriedades mecânicas e a alta processabilidade, com a condutividade elétrica da polianilina, aumentando o potencial tecnológico destes materiais. A polimerização via emulsão da anilina na presença de um outro polímero em solução [2][3][4][5] , tem sido uma alternativa viável. A vantagem deste método é que ele fornece uma grande quantidade de material que pode ser processado po...

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Elastic polyaniline with EPDM and dodecylbenzenesulfonic acid as plasticizers

Cited by 27 publications

References 49 publications

Reactive doping of PAni–CSA and its use in microwave absorbing materials

Reactive doping of PAni–CSA and its use in microwave absorbing materials

Elastomer composite based on EPDM reinforced with polyaniline coated curauá fibers prepared by mechanical mixing

Compósitos de borracha natural com polianilina

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