Biodegradable ion conducting solid polymer electrolyte films of carboxymethyl cellulose (CMC) doped with sodium bromide (NaBr) with various weight percentages were prepared by a solution casting technique. Their structural, optical and electrical properties were studied by various experimental techniques in order to understand the impact of the sodium metal salt on the biopolymer CMC’s properties. The optical parameters namely the optical bandgap energy and the refractive index, showed a significant variable variation with the metal salt concentration. The maximum dc conductivity was found to be ∼5.15 × 10⁻⁴ S cm⁻¹ at room temperature for the sample with 20 wt% of NaBr content in the CMC matrix. The ionic conductivity and dielectric constant in general, increased with increase in metal salt content, affirming the increase in ion concentration. The calculated transference number showed that the conductivity was mainly due to ions. The increase in conductivity was due to an increase in degree of amorphousness of the polymer upon doping, as analyzed by their XRD spectra.

通过溶液流延技术制备了掺有不同重量百分比的溴化钠（NaBr）的羧甲基纤维素（CMC）可生物降解的离子导电固体聚合物电解质膜。通过各种实验技术研究了它们的结构，光学和电学性质，以了解金属钠盐对生物聚合物CMC性质的影响。光学参数，即光学带隙能量和折射率，显示出随金属盐浓度的显着变化。发现最大直流电导率为〜5.15×10 ^-4 S cm ^-1在室温下，CMC基质中NaBr含量为20 wt％的样品。通常，离子电导率和介电常数随金属盐含量的增加而增加，这证实了离子浓度的增加。计算出的转移数表明电导率主要归因于离子。电导率的增加归因于掺杂后聚合物的非晶态程度的增加，如通过XRD光谱分析的那样。