Influence of chemical polymerization conditions on the properties of polyaniline

Cao, Yong; Andreatta, Alejandro; Heeger, Alan J.; Smith, Paul

doi:10.1016/0032-3861(89)90266-8

Cited by 606 publications

(288 citation statements)

References 11 publications

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“…Figure 5 shows the DSC results of pure polyaniline (Emeraldine base) powder prepared at three different temperatures. In this figure, there are two peaks, namely, an endothermic peak at 40-140 o C, and an exothermic peak at 150-310 o C in polyaniline results prepared at 0 o C and -25 o C. However, the exothermic peak for polyaniline at 25 o C, lies between 150 and 350 o C. According to studies reported previously [15][16][17], the polyaniline (EB) powder had a discernible moisture content. Therefore, the endothermic peak was most likely due to the vaporization of water.…”

Section: Scanning Electron Microscopymentioning

confidence: 77%

The influence of polymerization temperature on structure and properties of polyaniline

Yılmaz

Küçükyavuz

2009

E-Polymers

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Abstract:The influence of polymerization temperature (from -25 to +25 o C) on molecular weight, crystallinity, electrical conductivity, thermal and morphological properties of polyaniline has been investigated. Aniline was oxidized in an aqueous medium with ammonium persulfate and 1.0 M hydrochloric acid. The reaction mixture freezes below -10 o C and hence lithium chloride was used in sufficient amount to prevent freezing. As the reaction temperature decreases, both the molecular weight of polyaniline and its crystallinity increase. Thermal studies show a common three step decomposition pattern irrespective of the temperature used during synthesis. The morphology of polyaniline changes from granular (reaction in liquid medium) to tubular (polymerization in the frozen state). Thermal analysis indicated that the polyaniline stability increased with decreasing synthesis temperatures. Electrical conductivity of polyaniline was found to be independent of the polymerization temperature and, consequently, of the molecular weight.

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Section: Scanning Electron Microscopymentioning

confidence: 77%

The influence of polymerization temperature on structure and properties of polyaniline

Yılmaz

Küçükyavuz

2009

E-Polymers

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“…5,9,11,16,17 Both factors depend on a number of variables; the former is mostly based on the polymer's chemical structure, the number and nature of defect sites, conformation of the polymer backbone, and the molecular weight, while the latter strongly depends on the supramolecular architecture, that is, order and orientation. [25][26][27][28][29][30][31][32] Significant progress has been made in enhancing the charge carrier mobility in organic semiconductors with high molecular order and/or orientation as well as in crosslinked systems. [33][34][35][36] One of the key parameters that affects the efficacy of the electronic and optoelectronic devices mentioned above, for example, FETs, LEDs, organic photovoltaic cells, is the charge carrier mobility of the active material.…”

Section: Charge Transport In Organic Semiconductorsmentioning

confidence: 99%

Techniques for characterization of charge carrier mobility in organic semiconductors

Kokil

Yang

Kumar

2012

J Polym Sci B Polym Phys

151

128

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The charge transport characteristics of organic semiconductors are one of the key attributes that impacts the performance of organic electronic and optoelectronic devices in which they are utilized. For improved performance in organic photovoltaic cells, light-emitting diodes, and field-effect transistors (FETs), efficient transport of the charge carriers within the organic semiconductor is especially critical. Characterization of charge transport in these organic semiconductors is important both from scientific and technological perspectives. In this review, we shall mainly discuss the techniques for measuring the charge carrier mobility and not the theoretical underpinnings of the mechanism of charge transport. Mobility measurements in organic semiconductors and particularly in conjugated polymers, using space-charge-limited current, time of flight, carrier extraction by linearly increasing voltage, double injection, FETs, and impedance spectroscopy are discussed. The relative merits, as well as limitations for each of these techniques are reviewed.

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“…PMAP were synthesized by the chemical oxidative polymerization of MAP in aqueous acidic media (HCl) with APS as an oxidizing agent according to the procedure described by Pron et al [31] and Cao et al [32] for PANI modified by Kar et al [17] and Rivas et al [33] for PMAP.…”

Section: Synthesis Of the Pmapmentioning

confidence: 99%

Synthesis and characterization of poly(m-aminophenol)-succinat

Dinç

Yalçınkaya

Altuntaş

et al. 2014

Designed Monomers and Polymers

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Poly(m-aminophenol) (PMAP) and poly(m-aminophenol)-succinat compound (PMAP-Suc) containing ester bridge were synthesized in this study. PMAP were synthesized by chemical oxidative polymerization of m-aminophenol (MAP) in HCl medium with ammonium peroxydisulphate (APS) as an initiator at different temperatures. The optimum polymerization conditions (temperature: 25°C, reaction time: 4 h, normalized MAP/APS ratio, k: 0.625 and mol of MAP/mol of APS, r: 0.5) of PMAP were determined. PMAP was esterified in N-methyl pyrrolidone by using solution of succinic acid as cross-linking agent and concentrated sulphuric acid as catalyst under appropriate ambient conditions. The general scheme of esterification and cross-linking reaction for PMAP is proposed. These reactions were also evidenced by spectroscopic, thermal and surface morphology as well as structural characteristics relationship of macromolecules. The structures of PMAP and PMAP-Suc were characterized by solubility test, FTIR, 1 H NMR and 13 C NMR, UV-vis spectroscopy, thermal (TGA-DTA) and SEM analyses.

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Influence of chemical polymerization conditions on the properties of polyaniline

Cited by 606 publications

References 11 publications

The influence of polymerization temperature on structure and properties of polyaniline

The influence of polymerization temperature on structure and properties of polyaniline

Techniques for characterization of charge carrier mobility in organic semiconductors

Synthesis and characterization of poly(m-aminophenol)-succinat

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