Sodium ion conducting biopolymers electrolyte based on potato starch-chitosan blend

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Abstract
Solid polymer electrolyte was prepared by blending two different polymers to improve their mechanical properties using solution casting method. The conductivity of films was measured by electrical impendence spectroscopy (EIS) and showed a highest conductivity when 10 wt.% of NaCl incorporated with blending polymer of potato starch and chitosan at 4.82 × 10−6 S.cm−1. This phenomenon is best clarified as the dissociation of ion is higher at this rate and the energy barrier is lowered leads to increase the conductivities. The plot of log σ versus 1000/T for all systems follow the Vogel-Tamman- Fulcher (VTF) rule. ATR-FTIR studies the interaction after addition of salt, shows the shifted band of carboxamide and amine group due to the interaction of salt (Na+ ion and Cl− ion). From the X- Ray diffraction analysis, the blending 50 wt.% starch and 50 wt.% chitosan is the most amorphous blend exhibit to the higher conductivity of addition of 10 wt.% of NaCl into the blending system. The morphology of the systems was observed using scanning electron microscope (SEM). The morphology of highest conductivity film shows the roughness and pores in the systems indicate the space for the ions to moves and increase the conductivities compared the morphology of films beyond 10 wt.% of NaCl. It was showed that the crystalline structure and the movement of ions were inhibited and decreased the conductivity of films.

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