Abstract
Samples of polypyrrole were synthesised under galvanostatic conditions to produce films possessing a range of electrical conductivity from 10−3 to 10 S cm−1. The electrical and thermal conductivity of these films has been determined between 280 and 335 K. The electrical conductivity was measured using a four probe technique calibrated against ASTM D4496-87. Thermal conductivity was determined from measurements of thermal diffusivity, specific heat and density. Thermal diffusivity was determined using a modified a.c. calorimetry technique, while differential scanning calorimetry (DSC) was used to determine specific heat. The polymer's density was measured using Archimedes' principle. The results were used to calculate the Lorenz number of polypyrrole. A comparison of the predicted behaviour and experimental results was made. Thermal conductivity is found to be large compared to that predicted from the electrical conductivity measurements on low conductivity films. Molecular vibration effects are found to be non-trivial and experimental means for measuring their contribution are mentioned. While polypyrrole has been regarded as a “synthetic metal” the thermal conductivity results show this classification is wrong.
Similar content being viewed by others
References
J. R. Ellis, in “Handbook of Conducting Polymers” edited by T.A. Skotheim (Marcel Dekker, New York, 1986) Vol. 1, p. 489.
H. Naarmann and N. Theophilou, Synth. Met. 22 (1987) 1.
J. Unsworth, B. A. Lunn, P. C. Innis, Z. Jin, A. Kaynak and N. G. Booth, J. Intelligent Mater. Syst. Structures 3(3) (1992) 380.
K. K. Kanazawa, A. F. Diaz, M. T. Krounbi and G. B. Street, Synth. Met. 4 (1981) 119.
M. Satoh, H. Yamasaki, S. Aoki and K. Yoshino, ibid. 20 (1987) 79.
D. Moses and A. Denenstein, Phys. Rev. B 30(4) (1984) 2090.
P. R. Newman, M. D. Ewbank, C. D. Mauthe, M. R. Winkle and W. D. Smolyncki, Solid State Commun. 40 (1981) 975.
G. Leising and H. Kahlert, J. Physique Colloque 44 (1983) 111.
H. Yoon, B. S. Jung and H. Lee, Synth. Met. 41 (1991) 699.
H. J. Goldsmid, in “Thermal Properties of Solids” (Routledge and Kegan Paul, London, 1965) pp. 49–62.
J. E. Parrott and A. D. Stukes, in “Thermal Conductivity of Solids” (Pion, London, 1975) pp. 101–104 and 110–119.
J. Unsworth, Z. Jin, B. A. Lunn and P. C. Innis, Polym. Int. 26 (1991) 245.
I. Hatta, Y. Sasuga, R. Kato and A. Maesono, Rev. Sci. Instrum. 56 (8) (1985) 1643.
I. Hatta, R. Kato and A. Maesono, Japn J. Appl. Phys. 25 (1986) L493.
Idem., ibid. 26 (1987) 475.
D. H. Howling, E. Mendoza and J. E. Zimmerman, Proc. R. Soc. Lond. Ser. A 229 (1955) 86.
M. B. Salamon, P. R. Garnier, B. Golding and E. Buehler, J. Phys. Chem. Solids 35 (1974) 851.
B. A. Lunn, J. Unsworth and N. G. Booth, Polym. Sci., Submitted.
F. W. Billmeyer Jr, in “Textbook of Polymer Science” (John Wiley & Sons, New York, 1984) p. 243.
G. H. Aylward and T. J. V. Findlay, “SI Chemical Data” (John Wiley & Sons, New York, 1985) p. 6.
Y. S. Touloukien, R. W. Powell, C. Y. Ho and M. C. Nicalaou, in “Thermophysical Properties of Matter”, Vol. 2 (IFI/Plenum New York, 1973) pp, 958 and 964.
R. S. Elliott, in “Physics of Amorphous Materials” (Longman Scientific and Technical, London, 1984) p. 288.
N. F. Mott and E. A. Davis, in “Electronic Processes in Non-Crystalline Materials” (Oxford University Press, London, 1979) p. 34.
D. S. Maddison, R. B. Roberts and J. Unsworth, Synth. Met. 26 (1988) 99.
J. L. Bredas, J. C. Scott, K. Yakush and G. B. Street, Phys. Rev. B 30(2) (1984) 1023.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lunn, B.A., Unsworth, J., Booth, N.G. et al. Determination of the thermal conductivity of polypyrrole over the temperature range 280–335 K. JOURNAL OF MATERIALS SCIENCE 28, 5092–5098 (1993). https://doi.org/10.1007/BF00361185
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00361185