Immittance Studies of DBP Plasticized Salicylic Acid Doped PMMA Based Gel Electrolytes
|
| Journal |
Materials Science Forum (Volume 517) |
| Volume |
Functional Materials and Devices |
| Pages |
97-100 |
| DOI |
10.4028/www.scientific.net/MSF.517.97 |
| Online since |
June, 2006 |
| Authors |
M.I.N. Isa,
S.R. Majid,
A.K. Arof
|
| Keywords |
Gel Electrolytes, Immittance, PMMA, Relaxation Times, Salicylic Acid |
| Abstract |
A gel electrolyte system was prepared by dissolving poly(methyl methacrylate) in
ethylene carbonate and propylene carbonate doped with salicylic acid and plasticized with
dibutylphthalate (DBP). The gel was heated to 70 0C before it was cast into glass dishes. The
composition of the electrolytes was 35 wt% EC, 30 wt% PC, 5 wt% SA, 5wt% DBP and 25 wt%
PMMA. The gel electrolyte was sandwiched between two stainless-steel blocking electrodes and
impedance measurements were conducted. The conductivity of the gel electrolyte was 2.03 x 10-4 S
cm-1 at room temperature. The conductivity activation energy was obtained from the log σ versus
103/T graph. Loss tangent was calculated at every frequency for all temperatures. From the tan δ
versus frequency plot, the activation energy of relaxation of the ion was calculated and plotted as ln
τ versus 103/T. The conductivity activation energy value was (0.21 ± 0.04) eV and the activation
energy of relaxation was (0.24±0.07) eV. The similarity between these activation energies imply
that the protons ‘hop’ from one electronegative oxygen site in DBP to another. |
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