Journal of Materials Science

, Volume 43, Issue 16, pp 5436–5440 | Cite as

Effect of polyol excess on the electrical property of vegetable-polyurethane film

  • D. H. F. Kanda
  • H. N. Nagashima
  • J. A. Malmonge
  • W. K. SakamotoEmail author
  • G. O. Chierice


Freestanding castor oil-based polyurethane (PU) film was obtained using spin-coating method. The effect of polyol content was analysed by means of thermally stimulated depolarisation current and AC dielectric measurements techniques. Two relaxation peaks were observed in the temperature range of −40 to 60 °C for PU with different polyol contents. The presence of polyol excess provides a shift to lower temperature of the α relaxation and the decrease in the activation energy of the transition in this region might be attributed to the plasticising effect of the polyol. The peak at higher temperature is due to the Maxwell–Wagner–Sillars relaxation, which also shifts in the low temperature direction as the polyol content is increased.


Polyol Soft Segment Interfacial Polarisation Depolarisation Current Diphenylmethane Diisocyanate 



Special thanks are due to Poliquil Araraquara Polimeros Química Ltda for supplying the castor oil-based PU and to Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP for the financial support.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • D. H. F. Kanda
    • 1
  • H. N. Nagashima
    • 1
  • J. A. Malmonge
    • 1
  • W. K. Sakamoto
    • 1
    Email author
  • G. O. Chierice
    • 2
  1. 1.Department of Physics and ChemistryUniversity of São Paulo State—UNESPIlha SolteiraBrazil
  2. 2.Institute of ChemistryUniversity of São Paulo—USP/São CarlosSao Paulo Brazil

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