Conductance and relaxations of gelatin films in the glassy and rubbery states

Iwamoto, S., Kumagai, H., Hayashi, Y. ORCID: https://orcid.org/0000-0002-9207-6322 and Miyawaki, O. (1999) Conductance and relaxations of gelatin films in the glassy and rubbery states. International Journal of Biological Macromolecules, 26 (5). pp. 345-351. doi: 10.1016/S0141-8130(99)00105-1

Abstract/Summary

The dielectric constant, epsilon', and the dielectric loss, epsilon'', for gelatin films were measured in the glassy and rubbery states over a frequency range from 20 Hz to 10 MHz; epsilon' and epsilon'' were transformed into M* formalism (M* = 1/(epsilon' - i epsilon'') = M' + iM''; i, the imaginary unit). The peak of epsilon'' was masked probably due to dc conduction, but the peak of M'', e.g. the conductivity relaxation, for the gelatin used was observed. By fitting the M'' data to the Havriliak-Negami type equation, the relaxation time, tauHN, was evaluated. The value of the activation energy, Etau, evaluated from an Arrhenius plot of 1/tauHN, agreed well with that of Esigma evaluated from the DC conductivity sigma0 both in the glassy and rubbery states, indicating that the conductivity relaxation observed for the gelatin films was ascribed to ionic conduction. The value of the activation energy in the glassy state was larger than that in the rubbery state.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/30824
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Biological Sciences > Department of Bio-Engineering
Publisher	Elsevier
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