Determination of the thermal conductivity of polypyrrole over the temperature range 280–335 K

Lunn, B.; Unsworth, J.; Booth, Norman; Innis, Peter C.

doi:10.1007/bf00361185

Cited by 42 publications

(18 citation statements)

References 15 publications

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“…The specic heat of the PPy salt increased linearly with increase of temperature in the whole studied temperature range. These results are in good agreement with the specic heat values found on PPy lms by Lunn et al [24], where values of 800 1400 J kg −1 K −1 were found in the temperature range 767…”

Section: Resistivitysupporting

confidence: 92%

“…The thermal conductivity is determined as product of the thermal diusivity, the density, and the specic heat (see the Table). The thermal conductivity values are lower than the results presented by Lunn et al [24] where thermal conductivity obtained on lms was 0.86 W m −1 K −1 . The thermal conductivity of various types of samples can be dierent.…”

Section: Thermal Diusivity and Thermal Conductivitycontrasting

confidence: 77%

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Thermal Properties of Conducting Polypyrrole Nanotubes

et al. 2015

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Thermal properties of polypyrrole nanotubes synthesized by the chemical oxidation of pyrrole with iron(III) chloride in the presence of methyl orange as structure-guiding template, have been investigated. As-prepared polypyrrole salt and corresponding base were compressed into pellets. Thermogravimetric analysis has shown that the heating/cooling of both polymers is connected with water desorption/re-absorption. This process inuences all temperature dependences of the thermophysical properties. The specic heat of both polypyrrole forms was the same at 35• C. The thermal diusivity of polypyrrole base was lower than that of the salt. The dilatational characteristics are strongly inuenced by water desorption/re-absorption. Water desorption is connected with the contraction of polypyrrole and its re-absorption with the expansion of polypyrrole. The electrical resistivity was measured, in analogy to thermal experiments, by a four-point van der Pauw method. The electrical resistivity was 0.016 and 10.2 Ωcm at room temperature, for both materials. The electrical resistivity was also inuenced by water desorption/re-absorption as well as other thermophysical properties.

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Section: Resistivitysupporting

confidence: 92%

Section: Thermal Diusivity and Thermal Conductivitycontrasting

confidence: 77%

Thermal Properties of Conducting Polypyrrole Nanotubes

et al. 2015

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“…Compared to traditional inorganic thermoelectric materials, organic materials can exhibit tunable electrical and thermal conductivities by convenient molecular design. [18][19][20] Moreover, organic materials consist of more abundant elements, resulting in more efficient fabrication of organic thermoelectric devices. Although there have been investigations on thermal and thermoelectric properties of the semi-metallic polymers, the magneto-thermoelectric properties of organic thermoelectric materials have yet to be explored, and the thermoelectric properties in thin-film device applications demand further investigation.…”

mentioning

confidence: 99%

Magneto-Seebeck effect in an ITO/PEDOT:PSS/Au thin-film device

et al. 2016

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This article reports giant magnetic field effects on the Seebeck coefficient by exerting a Lorentz force on charge diffusion based on vertical multi-layer ITO/PEDOT:PSS/Au thin-film devices. The Lorentz force, induced by an external magnetic field, changes the charge transport and consequently generates angular dependent magnetoresistance. The proposed mechanism of the magneto-Seebeck effect is proved by measuring the magnetoresistance at a parallel, 45o and perpendicular angle to the temperature gradient. The gradual change of the magnetoresistance from a parallel to perpendicular angle indicates that the Lorentz force is a key driving force to develop the magneto-Seebeck effect. Therefore, our experimental results demonstrate a magnetic approach to control the thermoelectric properties in organic materials.

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“…[12,13] PPy is identifi ed as an electrically conducting biocompatible polymer with an inferior thermal conductivity. [14][15][16] Recently, PPy has been demonstrated for its thermoelectric applications and this property is integrated in to the textiles to develop smart clothing. [17] Viscose rayon is a known nonwoven fabric made out of regenerated wood cellulose, and it has been identifi ed for various applications such as disposable diapers, hygienic pads and medical textiles, due to its high bio-friendliness and very high moisture absorbing capacity.…”

Section: Doi: 101002/admi201300139mentioning

confidence: 99%

Molecular Motions Aided Thermally Responsive Biocompatible Textile Pads

Kadumudi

Narayanan

Kulandainathan

2014

Adv Materials Inter

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Polypyrrole-viscose rayon composite was prepared by in situ polymerisation of pyrrole using ferric chloride as an oxidant. Here, 0.5 g NWVR fabric (7 × 7 × 0.3 cm 3 , spunlace nonwoven obtained from Ginni fi laments, India) was soaked in 0.4 M ferric chloride solution and 0.2 M pyrrole monomer was slowly added in to this solution under constant stirring. This reaction was performed at room temperature (25 °C) for 4 hours. After 4 hours, the PPy deposited NWVR was washed several times with water and methanol in order to remove the unreacted pyrrole, ferric chloride and loosely bound PPy. Finally, this washed fabric was dried at room temperature and annealed at 70 °C under vacuum (for further details please see supporting information).The in situ polymerisation of pyrrole on NWVR leads to a conformal coating of PPy over NWVR ( Figure 1 a,b). The NWVR used for the present study has two different surface textures (more details about NWVR is given in the supporting information): the surface containing aligned cellulose fi bres (Figure S1a Figure S2). For further probing the surface functioanlisation of NWVR, and covalent attachment of PPy into the fi ber walls, Fourier Transform Infra-red (FTIR) spectroscopy has been conducted (Figure 1 d). A detailed description on FTIR is provided in the supporting information. Importantly, the bands present at 1232, 1040 and 665 cm −1 in the cellulose are attributed to the C-OH bending at C 6 , C-OH vibrations and C-OH out of plane bending, respectively. But, the red shift observed at 1232 cm −1 , blue shift at 1040 cm −1 and the increase in relative intensity at 665 cm −1 in the PPy-NWVR composite confi rms the hydrogen bond formation between -OH functional groups present in the NWVR and -NH group present in the PPy (details, please see supporting information). Thermal stability of the NWVR and PPy-NWVR were studied using TGA (Figure 1 e) and it is clear that the PPy-NWVR keeps the same thermal stability of pristine NWVR.The thermal response of a PPy-NWVR pad (dimensions: 1 × 7 × 0.3 cm 3 ) is demonstrated in Figure 2 a. This pad is placed over a temperature controlled hot plate, and further thermal response of the pad over controlled heating is monitored and recorded (Figure 2 b and video provided in the supporting Development of smart and intelligent textiles (fabrics) is sought after for tremendous applications ranging from textile industries to robotic engineering. [1][2][3][4][5] Synergy of textile chemistry and polymer engineering can leads to the development of such smart and functional composite materials. Moreover, such a synergy can also bring mechanical fl exibility, strength and thermal stability to the designed fabrics. Thermally responsive polymer (TRP) composites are one such class of materials where the polymers can respond to external thermal stimuli causing molecular level global or local dimensional changes. Different types of TRPs in the forms of solution (liquid), fi bres, foams, and fi lms were demonstrated in the recent past. [6][7][8]

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Determination of the thermal conductivity of polypyrrole over the temperature range 280–335 K

Cited by 42 publications

References 15 publications

Thermal Properties of Conducting Polypyrrole Nanotubes

Thermal Properties of Conducting Polypyrrole Nanotubes

Magneto-Seebeck effect in an ITO/PEDOT:PSS/Au thin-film device

Molecular Motions Aided Thermally Responsive Biocompatible Textile Pads

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