| 摘 要： | 1 Results Starch is considered a suitable source material because of its inherent biodegradability,ready viability and relatively low cost1].In the present work,polymer electrolytes based on starch have been prepared by the solution cast technique.The conductivity of the films is characterized using impedance spectroscopy at room temperatures.The imaginary impedance (Zi) versus real impedance (ZR) plot of pure starch films consists of a semicircle.The bulk resistance (Rb) was taken from the intercept on the real axis at the higher frequency side and the calculated value of electrical conductivity is 6.28×10-10 S·cm-1.The value of Rb for the salted film is smaller compared to that obtained for the pure starch film.This implies that the conductivity has increased with addition of salt to 3.93×10-5 S·cm-1 for the film containing 25 wt.% salts.Samples prepared with greater than 30 wt.% of NH4NO3,did not result in good quality films.The plot of conductivity versus concentration of NH4NO3 is shown in Fig.1.The Rice and Roth model was used to calculate the number density of mobile ions.Mobility and diffusion coefficients of the systems were also calculated using appropriate equations.
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