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Conductivity and dielectric relaxation of gelatin films with glycerol as plasticizer

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Abstract

Gelatin films complexed with ionic salts are of current interest as potential solid polymer electrolytes. However, even without salt, gelatin films are found to have quite high ionic conductivity at room temperature (around 30 °C), when plasticized with an adequate fraction of glycerol. In the present work, the admittance and dielectric properties of gelatin are studied as a function of glycerol content and temperature. An enhancement in the ionic conductivity by four orders of magnitude to ∼9.13 × 10−3 S/m at room temperature is obtained by adding 35.71 wt% of glycerol. This enhancement appears to be correlated with the changes in the local microstructure on plasticizer addition. Admittance and dielectric relaxation have been studied to understand the dynamics of the charge carriers. Differential scanning calorimetry, X-ray diffraction and scanning electron microscopy are also done.

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Acknowledgment

We are grateful to T. R. Middya for the helpful suggestions and encouragement. The authors sincerely thank Tapan Singha, Metallurgy department, Jadavpur University for the SEM and Sreedip Bera from IACS for the DSC. T. Basu thanks DST, Govt. of India, for the award of INSPIRE research fellowship.

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  1. Condensed Matter Physics Research Centre, Physics Department, Jadavpur University, Kolkata, 700032, India

    Tania Basu & Sujata Tarafdar

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  1. Tania Basu
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  2. Sujata Tarafdar
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Correspondence to Sujata Tarafdar.

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Basu, T., Tarafdar, S. Conductivity and dielectric relaxation of gelatin films with glycerol as plasticizer. Ionics 20, 1445–1454 (2014). https://doi.org/10.1007/s11581-014-1084-5

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