The Spectroscopic Characterization of Polydiphenylamine and one of its Oligomeric Fractions

Santana, Henrique de; Temperini, M. L. A.

doi:10.5935/0103-5053.19960087

Cited by 5 publications

(3 citation statements)

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“…and Table , respectively. The absorption bands at 3388 and 3053 cm −1 represent the N−H stretching and C−H stretching in the aromatic rings, respectively . The bands at 1594, 1505 and 1318 cm −1 correspond to quinoid ring stretching, phenyl hydrogen and benzenoid ring stretching, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of polydiphenylamine with tunable size and shape via emulsion polymerization

Permpool

Sirivat

Aussawasathien

2014

Polymer International

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Section: Resultsmentioning

confidence: 99%

Synthesis of polydiphenylamine with tunable size and shape via emulsion polymerization

Permpool

Sirivat

Aussawasathien

2014

Polymer International

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“…Foi inicialmente realizado um estudo Raman ressonante do copolímero pirrol -difenilamina, com base nas atribuições das bandas Raman características das espécies radical cátion e dicátion dos homopolímeros da difenilamina (SANTANA; TEMPERINI, 1996;SANTANA;MATOS;TEMPERINI, 1998) Com o objetivo de verificar as propriedades eletrônicas dos materiais formados nos copolímeros, foram realizadas as medidas de condutividade eletrônica, conforme Gruber et al (1997). Na Tabela 1 e 2 são apresentados os valores de condutividade eletrônica dos homopolímeros e dos copolímeros formados, levando em consideração as diferentes condições durante a síntese eletroquímica.…”

Section: Resultsunclassified

Estudo do Copolímero Pirrol/Difenilamina por espectroscopia vibracional e condutividade eletrônica

2004

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ResumoO objetivo deste estudo foi analisar as propriedades físicas do copolímero formado pela deposição eletroquímica do homopolímero da polidifenilamina (PDFA) sobre o polipirrol (Ppy), e do polipirrol sobre a polidifenilamina, em diferentes condições, por meio da caracterização dos materiais formados pelas técnicas Raman ressonante, FT-IR e condutividade. Foram verificadas as interações entre as espécies presentes na nova estrutura dos copolímeros e as mudanças na condutividade eletrônica. Foi também sintetizado eletroquimicamente o copolímero PDFA/Ppy na presença do íon iodeto e o material foi caracterizado por FT-IR e condutividade. Neste estudo foi considerado o papel significativo do dopante no processo de transferência de carga entre o copolímero-dopante, atuando na estabilização das espécies na matriz polimérica e aumento da condutividade eletrônica. Palavras-chave: Polidifenilamina. Polipirrol. Copolímero. Polímero condutor. A b s t r a c tThe main goal of this study was to analyze the physical properties of the copolymer formed by the electrochemical deposition of the polydiphenylamine (PDPA) on polypyrrole (Ppy) and Ppy on PDPA, in different conditions, through the characterization of the materials formed by the resonant Raman, FT-IR and conductivity techniques. The interactions among the species which are present in the new copolymer structure and the changes in electronic conductivity, were verified. The copolymer was also synthesized electrochemically in the presence of iodide species and the material was characterized by FT-IR spectroscopy and conductivity. The role of the dopant was studied in the process of charge transfer between the copolymer-dopant, acting in the stabilization of the species in the polymer backbone and the increase of the electronic conductivity.

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“…Thus, the electron mobility along the D-PDPA backbone becomes more difficult, and the band gap of D-PDPA increases. It needs more energy to accelerate the electron to a higher conduction band, resulting in the shift of the electronic band of D-PDPA to a higher energy or a lower wavelength 16,45 . The absorption band observed at 271 nm corresponds to the -Si-O 4 2-site on the Y_H + framework 46 ( Figure 8b).…”

Section: Sensitivity Of D-pdpa and Y_h + Towards Halogenated Solventsmentioning

confidence: 99%

Polydiphenylamine/Zeolite Y composites and electrical conductivity responses toward halogenated hydrocarbons

et al. 2013

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Composites of polydiphenylamine (D-PDPA) and zeolite Y with H + as the cation (Y_H + ) have been fabricated to be used as a sensing material towards non-halogenated and halogenated solvents (hexane, dichloromethane, 1, 2-dichloroethane, chloroform). These composites are toxic towards human and environment and are widely used as solvents in various industries. Polydiphenylamine, zeolite Y, and their composites are characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, particle size analysis, surface area, and pore size analysis. The effects of the Si/Al ratio, zeolite content, and vapor concentrations are investigated. The electrical conductivity sensitivity of the composites towards the solvents is higher than the pristine D-PDPA by ~1 order of magnitude. The composites can discriminate a non-halogenated solvent from halogenated solvents. They possess maximum electrical conductivity sensitivity values towards dichloromethane, but the composites do not respond to hexane. Generally, the sensitivity of the composites increases with increasing zeolite content and vapor concentration. The interactions between the composites and the vapors are investigated by FT-IR spectroscopy and UV-Vis spectroscopy. A mechanism for the interaction between the composites and the solvents is proposed.

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The Spectroscopic Characterization of Polydiphenylamine and one of its Oligomeric Fractions

Cited by 5 publications

References 0 publications

Synthesis of polydiphenylamine with tunable size and shape via emulsion polymerization

Synthesis of polydiphenylamine with tunable size and shape via emulsion polymerization

Estudo do Copolímero Pirrol/Difenilamina por espectroscopia vibracional e condutividade eletrônica

Polydiphenylamine/Zeolite Y composites and electrical conductivity responses toward halogenated hydrocarbons

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