Dextran from Leuconostoc mesenteroides-doped ammonium salt-based green polymer electrolyte

[摘要] Biopolymer electrolytes based on dextran from Leuconostoc mesenteroides doped with ammonium nitrate (NH$_4$NO$_3$) are synthesized via a solution cast method. Fourier transform infrared analysis is used to determine the complexation between cation from the salt with functional groups of dextran. The ionic conductivity of undoped dextran film at room temperature is identified as $ (8.24 \pm 0.31) \times 10^{−11}$ S cm$^{−1}$. A conductivity of $(3.00 \pm 1.60) \times 10^{−5}$ S cm$^{−1}$ isachieved with the inclusion of 20 wt% NH$_4$NO$_3$ to the pure dextran film. The conductivity at a high temperature of the electrolyte obeys Arrhenius theory. Field emission scanning electron microscopy results show that the highest conducting sample has a porous surface. Results from the dielectric study show a non-Debye characteristic.

[学科分类] 材料工程

[关键词] Biopolymer;dextran;ammonium nitrate;dielectric;ionic conductivity.