Thermal studies on polyindole and polycarbazole

Abthagir, P. Syed; Kasi, Dhanalakshmi; Saraswathi, R.

doi:10.1016/s0379-6779(98)80125-2

Cited by 83 publications

(47 citation statements)

References 40 publications

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“…Many statements of the structure and polymerization mechanism of PCZ are translated from polypyrrole or polyindole studies. Therefore, extensive work has been devoted to the study of PCZ in the past several years [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of High-quality Polycarbazole Films in Composite Electrolytes of Boron Trifluoride Diethyl Etherate and Ethyl Ether

Nie

Zhang

et al. 2006

J Appl Electrochem

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High-quality polycarbazole (PCZ) films were synthesized electrochemically by direct oxidation of carbazole in boron trifluoride diethyl etherate (BFEE) containing vol. 20% ethyl ether (EE). The oxidation potential of carbazole in this medium was measured to be only 0.90 V vs. SCE, which was lower than that determined in acetonitrile containing 0.1 mol l )1 Bu 4 NBF 4 (1.35 V vs. SCE). PCZ films obtained from this medium showed better electrochemical behavior, better thermal stability with conductivity of 7.5 Â 10 )3 S cm )1 being one order of magnitude higher than those reported previously, indicating that BFEE/EE was a better medium than acetonitrile for the electrosyntheses of PCZ films. As-formed PCZ films can be partly dissolved in acetone, acetonitrile and tetrahydrofuran. Spectral analysis provided evidence for the existence of the conjugated structure of the PCZ chain. Fluorescent spectra indicate that electrosynthesized PCZ is an ideal blue light emitter.

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Section: Introductionmentioning

confidence: 99%

Electrodeposition of High-quality Polycarbazole Films in Composite Electrolytes of Boron Trifluoride Diethyl Etherate and Ethyl Ether

Nie

Zhang

et al. 2006

J Appl Electrochem

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“…Their results on the thermogravimetric analysis indicated that the polyindole was decomposed at a higher temperature compared to polyaniline. Our earlier study also emphasized the higher thermal stability of polyindole and polycarbazole than polyaniline, polypyrrole and polythiophene [24]. There has been no systematic evaluation of thermal stability of polycarbazole and poly(N-vinylcarbazole) in literature.…”

Section: Thermal Stabilitymentioning

confidence: 86%

“…Different methods are available for the extraction of activation energy from the analysis of TG data [36,37]. Our earlier studies [24,35] have shown that the Horowitz and Metzger method [38] gives consistent energy of activation (E a ) values for the polymer decomposition from the TG data of the doped and dedoped polymers in either air or in N 2 atmosphere and hence this method is adopted in the present study. The method involves plotting double logarithm of the reciprocal of the weight fraction of the reactant versus temperature.…”

Section: Kinetic Analysis Of Tg Datamentioning

confidence: 99%

Charge transport and thermal properties of polyindole, polycarbazole and their derivatives

Abthagir

Saraswathi

2004

Thermochimica Acta

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The time and temperature dependences of conductivity of four polymers namely polyindole, polyindole-5-carboxylic acid, polycarbazole, and poly(N-vinylcarbazole) are analysed to understand the aging process and conduction mechanism. The polymers are prepared electrochemically. The conductivity data obtained over a temperature range are fitted to Arrhenius and Mott equations. The thermal degradation of both doped and dedoped samples of the four polymers in air and N 2 atmosphere has been followed using thermogravimetric (TG) and differential thermal analysis (DTA). The thermal activation energies are evaluated by Horowitz and Metzger method.

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“…PIn is electroactive polymer, which can be derived either by chemical oxidation or by electrochemically oxidation of monomer using FeCl 3 or CuCl 2 as an oxidant [11]. PIn shows good thermal stability, high-redox activity and stability, and slow degradation rate in comparison with PANi and PPy [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Complex optical studies on conducting polyindole as-synthesized through chemical route

Wadatkar,

Waghuley

2015

Egyptian Journal of Basic and Applied Sciences

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a b s t r a c tThis research article reports the novel UV-vis spectroscopic studies on as-synthesized conducting polyindole (PIn) through chemical polymerization route at room temperature using anhydrous ferric chloride as an oxidant. The complex optical properties of derived samples were studied by using UV-vis spectroscopy. The as-synthesized polymeric samples exhibited absorption around 220e300 nm. The optical band gap was found to ranges over 4.630e5.224 eV. The maximum optical conductivity for 0.6 M FeCl 3 was found to be 7.93 Â 10 8 S À1 at 275 nm. The estimated optical band gap accomplished that this material has potential applications in optical devices.

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Thermal studies on polyindole and polycarbazole

Cited by 83 publications

References 40 publications

Electrodeposition of High-quality Polycarbazole Films in Composite Electrolytes of Boron Trifluoride Diethyl Etherate and Ethyl Ether

Electrodeposition of High-quality Polycarbazole Films in Composite Electrolytes of Boron Trifluoride Diethyl Etherate and Ethyl Ether

Charge transport and thermal properties of polyindole, polycarbazole and their derivatives

Complex optical studies on conducting polyindole as-synthesized through chemical route

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