Thermal treatment and dynamic mechanical thermal properties of polyaniline

Rodrigues, Paula C.; Souza, Gabriel Pinto de; Neto, Joaquim Delphino Da Motta; Akcelrud, Leni

doi:10.1016/s0032-3861(02)00401-9

Cited by 44 publications

(44 citation statements)

References 31 publications

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“…2(a) and (b), respectively. Pani cast films from NMP solutions always contain a certain amount of residual solvent [26], which was detected by the absorption at 1670 cm 21 and also by TGA of the free standing film, as discussed further on. The main features observed in the spectrum of doped and non-doped Pani are in agreement with published data [27,28].…”

Section: Polyanilinementioning

confidence: 85%

Networks and blends of polyaniline and polyurethane: correlations between composition and thermal, dynamic mechanical and electrical properties

Rodrigues

Akcelrud

2003

Polymer

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Section: Polyanilinementioning

confidence: 85%

Networks and blends of polyaniline and polyurethane: correlations between composition and thermal, dynamic mechanical and electrical properties

Rodrigues

Akcelrud

2003

Polymer

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“…It is noteworthy that the maximum of the DTG peak shifted to higher temperature for the sample sulfonated at ½ hour and decreased progressively with the increase of the sulfonation time. Akcelrud et al 23 published a comprehensive article on polyaniline DMTA thermal transitions from NMP cast films. Multiple relaxations were detected in the temperature range from -150 to 250 °C and, for annealed samples, a transition immediately preceding the glass transition temperature (T g ) was reported.…”

Section: Differential Scanning Calorymetry (Dsc)mentioning

confidence: 99%

Sulfonated polyaniline: influence of sulfonation routes on its thermal and structural characteristics

et al. 2011

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In order to study the influence of different sulfonation routes on its thermal and structural properties sulfonated polyaniline (SPAni) was prepared. FT-IR revealed that the formation of PAni salt or ring sulfonation depends on the route. UV-visible spectra pointed out that the level of the PAni protonation was dependent on the sulfonation route. A new approach was given for TG/DTG and DSC results correlating different energy levels with the distinguished sulfonation routes. The TG/DTG degradation steps and the amount of the released material corroborated the structural differences of the polyanilines. For each DSC first regime of heating, a broad and intense peak (from -30 to 250 °C) with different level of energy was noticed. That peak could be ascribed to the multiple relaxations and breaking of the PAni intra and inter hydrogen bonds after sulfonation.

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“…The data on mechanical relaxation [17] showed that, when PANI is heated to 200oC, the mobility of the polymer chains decreases, which, in the authors' opinion, is due to the formation of weakly crosslinked structures. With PE samples [18], no thermal effects except melting at~130oC were observed in the TGA curves recorded upon heating to 300oC in a vacuum.…”

Section: ääääääääääääääääääääáäääääääääáääääääääämentioning

confidence: 82%

Electrophysical Properties and Thermal-Deformation Stability of Composites Containing Polyaniline Layers Deposited on Porous Polyethylene Films

et al. 2005

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The conducting properties of composites prepared by deposition of polyaniline layers on the surface of porous polyethylene films from dispersions and by polymerization in situ were studied.Conducting polymers such as polyacetylene, polyaniline (PANI), polypyrrole, polythiophene, and their derivatives are novel promising materials attracting researchers' attention [1,2]. They are used in membrane processes, electric batteries, and new types of electronic and optoelectronic devices, and also as sensitive elements in modern sensor systems, antistatic agents, and microwave absorbers. Due to relatively high intrinsic conductivity and chemical stability, and also to diverse and simple preparation procedures, polyaniline is the most promising conducting polymer [3,4]. However, low strength, brittleness, and very poor solubility hinder utilization and treatment of PANI. These disadvantages can be effectively overcome by preparing composites containing PANI as conducting component [5,6]. Development of methods for preparing composites consisting of conducting layers on various supports is an urgent problem. When the composites are used as membranes, the resistance of the supports to the mass transfer should be minimal, and porous materials containing through channels meet this requirement.In this work we used porous polyethylene (PE) supports, because they exhibit good mechanical properties and high chemical resistance with respect to organic solvents, acids, and alkalis.We studied the electrical and mechanical properties of composites consisting of PANI layers deposited on porous PE film supports. Since in service these composites can be exposed to thermal treatment, we also studied their thermal-deformation behavior and structural transformations. EXPERIMENTAL The required porous films were prepared from high-density polyethylene (M w 1.4 0 10 5 , M w /M n 6 38, and mp 132oC). The porous structure was formed by uniaxial extension of the film prepared by extrusion of the melt with subsequent annealing [7]. The total porosity of the resulting 20-mm films was 40%. These porous films contained through channels (180 3 360 nm in diameter) [7, 8] and had developed rough surface [9, 10] providing high adhesion of the films to the layers deposited. The PE/PANI composites were prepared by two procedures: by chemical oxidative polymerization from aniline solutions directly on the porous film surface [PE/PANI(in situ)] and by deposition of a polyaniline dispersion on the film surface [PE/PANI (disp.)].To prepare the PE/PANI(in situ) systems, the porous PE film was immersed into the reaction mixture containing aniline hydrochloride (0.2 M), ammonium peroxodisulfate (0.25 M), and excess hydrochloric acid (1 M). The polymerization time was varied from 8 min to 2 days. Then, the resulting film was dried in a vacuum at room temperature. The polymerization was carried out at 5 and 20oC.The colloidal PANI dispersion was prepared as follows. To a solution of dodecylbenzenesulfonic acid (0.1 M, 100 ml), we successively added aniline (0.01 m...

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Thermal treatment and dynamic mechanical thermal properties of polyaniline

Cited by 44 publications

References 31 publications

Networks and blends of polyaniline and polyurethane: correlations between composition and thermal, dynamic mechanical and electrical properties

Networks and blends of polyaniline and polyurethane: correlations between composition and thermal, dynamic mechanical and electrical properties

Sulfonated polyaniline: influence of sulfonation routes on its thermal and structural characteristics

Electrophysical Properties and Thermal-Deformation Stability of Composites Containing Polyaniline Layers Deposited on Porous Polyethylene Films

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