Electrical properties and fractal behavior of polyurethane elastomer/polyaniline composites under mechanical deformation

Hrehorova, Erika; Bliznyuk, Valery N.; Pud, A. A.; Shevchenko, V. V.; Fatyeyeva, Kateryna

doi:10.1016/j.polymer.2007.05.065

Cited by 31 publications

(18 citation statements)

References 18 publications

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“…Further simple solution mixing of the two polymer followed by casting are known to allow the formation of volume modified film composites with linear current-voltage characteristics. 48 We have successfully prepared films of PTSA-doped PANI and PUSAs. It was observed that the change of PU by PU anionomer resulted in an increase in conductivity by 10 2 fold, with concomitant lowering of percolation threshold.…”

Section: Resultsmentioning

confidence: 99%

“…The different amount of reactants used for them are listed in Table I. 36 Out of the four solvents DMF, DMSO, NMP and THF tested for the purpose, DMF was found to be the most suitable for the following reasons: (a) deprotonation was observed when pre-doped PANI was dissolved in NMP, which was evident from the typical bluish colour instead of green colour of PANI in its conducting form. 37 Deprotonation was also observed in DMF but in more dilute solutions only, probably because of less basicity of DMF than NMP.…”

Section: Synthesis Of Pani Emeraldinementioning

confidence: 99%

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Conductive composites from polyaniline and polyurethane sulphonate anionomer

Deka

Bora

Upadhyaya

et al. 2014

J of Applied Polymer Sci

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The present work describes the synthesis of conductive composite of polyurethane sulphonate anionomer (PUSA) and para toluene sulphonic acid doped polyaniline (PANI-PTSA). HCl-doped PANI was synthesized by chemical oxidative polymerization of aniline in HCl, which was converted to PANI-EB by treatment with NH 4 OH. PTSA doped PANI was synthesized from EB-PANI by redoping with PTSA solution. PUSA was synthesized from 4, 4 0 -diphenylmethanediisocyanate (MDI), polypropylene glycol (PPG), 1,4-butanediol (BD), and ionic diol SDOL. The composite was prepared by mixing of the solutions of two polymer components in DMF and then solution casting. The products were characterized and analyzed by UV-Vis and FTIR spectroscopy, thermogravimetry, differential scanning calorimetry and scanning electron microscopy. The conductivity was found to increase by 100 times with concomitant decrease in percolation threshold when polyurethane was replaced by PUSA in the composite for the same amount of polyaniline. The composite film was thermally stable upto 300

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of Pani Emeraldinementioning

confidence: 99%

Conductive composites from polyaniline and polyurethane sulphonate anionomer

Deka

Bora

Upadhyaya

et al. 2014

J of Applied Polymer Sci

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“…1 Polyaniline, poly toluidine, polypyrrole, poly aminopyridine, polythiophene and poly phenylenediamine are examples of conductive polymers, showing high conductivity. Polyaniline is an important member of the intrinsically conductive polymers because of the ease of its preparation, an excellent environmental stability, interchangeable oxidation states, electrical and optical properties, economic costs, [2][3][4] and because they can be used for chemical sensors, 5,6 electromagnetic shielding, 7 electrochemical and corrosion devices.…”

Section: Introductionmentioning

confidence: 99%

Copolymerization of poly (o-phenylenediamine-co-o/p-toluidine) via the chemical oxidative technique: synthesis and characterization

Melad¹,

Jarour²

2017

Mater. tehnol.

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Chemical oxidative copolymerization of o-phenylenediamine -co-o/p-toluidine at different molar ratios of monomer was performed using potassium dichromate as an oxidant. The resulting copolymers were investigated using Fourier transform infrared spectroscopy (FTIR) and UV-visible spectroscopy. In the copolymer, the intensity of the band at 1005 cm -1 is substantially decreased due to the -CH3 bending vibrations. A hyposochromic shift is observed in UV-visible spectroscopy. The electrical-conductivity values obtained for the o-toluidine copolymers are higher than those for the p-toluidine copolymers. Keywords: o-phenylenediamine, o-toluidine, p-toluidine, conductivity, chemical oxidativeness, FTIRIzvedena je bila kemijska oksidativna kopolimerizacija o-fenilendiamina-co-o/p-toluidina pri razli~nih molarnih razmerjih monomera, z uporabo kalijevega dikromata kot oksidanta. Nastali kopolimeri so bili preiskovani z uporabo infrarde~e spektroskopije s Fourierjevo transformacijo (FTIR) in UV-vidno spektroskopijo. V kopolimeru je intenziteta pasu pri 1005 cm -1 ob~utno zmanj{ana zaradi upogibnih vibracij -CH3. V UV vidnem spektru je opa`en zamik v spektralnem pasu. Vrednosti elektri~ne prevodnosti dobljene pri o-toluidin kopolimerih so vi{je kot pri p-toluidin kopolimerih.

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“…Em muitas misturas de polímeros condutores e isolantes verifica-se que o limite de percolação é baixo, e o acréscimo contínuo da fase de PIC na mistura aumenta linearmente a condutividade elétrica do material final e não abruptamente como ocorre com cargas inorgânicas. 9,10 Embora existam vários trabalhos na literatura relacionados ao tema, [11][12][13] a preparação de elastômeros com polímeros condutores intrínsecos ainda apresenta desafios relacionados à dificuldade do processo de reticulação da fase elastomérica na presença do PIC, principalmente aqueles que são considerados polímeros ácidos, como a PANI. [14][15][16][17] Para superar essa dificuldade, alguns trabalhos sugerem a preparação de materiais baseados em misturas com elastômeros termoplásticos (TPE), os quais não necessitam da etapa final de reticulação.…”

Section: Introductionunclassified

Ionic Liquids as Plasticizers in Nitrile Rubber/Polyaniline Blends

2014

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Recebido em 11/07/2013; aceito em 18/12/2013; publicado na web em 21/3/2014 IONIC LIQUIDS AS PLASTICIZERS IN NITRILE RUBBER/POLYANILINE BLENDS. Two imidazolium-based ionic liquids (C 4 MIMTf 2 N and C 4 MIMBF 4 ) were used to verify their influence on polyaniline (PANI) and nitrile rubber (NBR)/PANI blend properties and the vulcanization process. High conductivity values were observed for PANI-C 4 MIMTf 2 N samples and no interference was found for the C 4 MIMBF 4 samples. These materials were added to NBR by mechanical mixing. Based on the torque results, the presence of C 4 MIMBF 4 does not protect the vulcanization reaction of NBR with PANI as performed by C 4 MIMTf 2 N. The highest conductivity value was obtained with 7 wt. % of PANI-DSBA-C 4 MIMTf 2 N (10 -6 S/cm). This result is attributed to the more effective interaction of PANI and NBR phases promoted by the ionic liquid.Keywords: conductive elastomer; vulcanization; ionic liquids; polyaniline. INTRODUÇÃOPolianilina (PANI), um dos polímeros intrinsecamente condutores (PIC) mais estudados devido à sua estabilidade química em condições ambientais, facilidade de síntese e dopagem, baixo custo e possibilidades de aplicações tecnológicas, tem sido amplamente usada como fase condutora de blendas poliméricas. 1-5 A adição de polímeros condutores em elastômeros resulta em blendas com propriedades mecânicas e condutoras aprimoradas, podendo ser empregadas em áreas tecnológicas, tais como sensores de pressão, revestimento de fios e cabos elétricos, contatos elétricos, tapetes e correias com propriedades antiestáticas e materiais absorvedores de radiação eletromagnética. [6][7][8] Sucintamente, há duas formas de transformar um material polimérico isolante, como um elastômero, em condutor. A primeira é pela adição de cargas condutoras como negro de fumo condutor, fibras de carbono e partículas metálicas, e a segunda é pelo acréscimo de um PIC como a polianilina. A grande vantagem do uso do PIC é devido à possibilidade de modular a condutividade elétrica do material final em função do seu teor. Em muitas misturas de polímeros condutores e isolantes verifica-se que o limite de percolação é baixo, e o acréscimo contínuo da fase de PIC na mistura aumenta linearmente a condutividade elétrica do material final e não abruptamente como ocorre com cargas inorgânicas. 9,10 Embora existam vários trabalhos na literatura relacionados ao tema, 11-13 a preparação de elastômeros com polímeros condutores intrínsecos ainda apresenta desafios relacionados à dificuldade do processo de reticulação da fase elastomérica na presença do PIC, principalmente aqueles que são considerados polímeros ácidos, como a PANI. 14-17 Para superar essa dificuldade, alguns trabalhos sugerem a preparação de materiais baseados em misturas com elastômeros termoplásticos (TPE), os quais não necessitam da etapa final de reticulação. 18 Adicionalmente, a segregação das fases causada pela imiscibilidade entre os elastômeros e PIC é outra dificuldade a ser vencida. O uso de substâncias que auxiliem na compatibi...

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Electrical properties and fractal behavior of polyurethane elastomer/polyaniline composites under mechanical deformation

Cited by 31 publications

References 18 publications

Conductive composites from polyaniline and polyurethane sulphonate anionomer

Conductive composites from polyaniline and polyurethane sulphonate anionomer

Copolymerization of poly (o-phenylenediamine-co-o/p-toluidine) via the chemical oxidative technique: synthesis and characterization

Ionic Liquids as Plasticizers in Nitrile Rubber/Polyaniline Blends

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