Different composition ratio of polymer electrolytes based on poly(ethylene oxide) (PEO) as host polymer, ammonium bifluoride (NH4HF2) as salt, and propylene carbonate (PC), dimethyl acetamide (DMA), dimethyl chloride (DMC), and diethyl carbonate (DEC) as plasticizers has been prepared by solution casting technique. The influence of high dielectric constant plasticizers (PC and DMA) and low dielectric constant plasticizers (DMC and DEC) on the ion transport properties of PEO-NH4HF2 polymer electrolytes has been studied. The increase in ionic conductivity of polymer electrolytes containing PC and DMA is observed to be more as compared to those electrolytes containing DMC and DEC, which is due to an increase in both the amorphous phase and dielectric constant of PEO. X-ray diffraction study reveals the amorphous nature in case of plasticized polymer electrolyte. In the Fourier transform infrared study, the changes and shifting of the different characteristic peaks confirm the polymer–salt complex formation and the dissociation of ion aggregates present at higher concentration of salt with the addition of PC. Maximum ionic conductivity of 1.40 × 10−4 S cm−1 at room temperature has observed in case of plasticized polymer electrolytes containing optimum concentration of PC so that mechanical stability and flexibility be maintained. The variation of linewidth with temperature has also been studied by 1H and 19F nuclear magnetic resonance (NMR), which confirms that both cations and anions are mobile in these polymer electrolytes. Line narrowing associated with the glass transition temperature (T g; low mobility region) and melting temperature (T m; high mobility region) of PEO has also been observed for plasticized polymer electrolytes containing PC having optimum conductivity value. Conductivity versus temperature variation study reveals curved nature of plot in case of plasticized polymer electrolytes containing high dielectric constant plasticizers, which is significant for their amorphous nature. Smooth morphology observed in case of plasticized polymer electrolytes having optimum conductivity value is essential key factor for polymer electrolytes to be suitable for practical applications.

中文翻译：

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高、低介电常数增塑剂对PEO：NH4HF2聚合物电解质离子传输性能的影响

以聚环氧乙烷 (PEO) 为主体聚合物，氟化氢铵 (NH4HF2) 为盐类，碳酸丙烯酯 (PC)、二甲基乙酰胺 (DMA)、二甲基氯 (DMC) 和碳酸二乙酯为基础的聚合物电解质的不同组成比(DEC) 作为增塑剂已通过溶液浇铸技术制备。研究了高介电常数增塑剂（PC 和 DMA）和低介电常数增塑剂（DMC 和 DEC）对 PEO-NH4HF2 聚合物电解质离子传输性能的影响。与含有 DMC 和 DEC 的电解质相比，含有 PC 和 DMA 的聚合物电解质的离子电导率增加更多，这是由于非晶相和 PEO 的介电常数增加。X 射线衍射研究揭示了增塑聚合物电解质的无定形性质。在傅里叶变换红外研究中，不同特征峰的变化和移动证实了聚合物-盐复合物的形成和离子聚集体在添加 PC 的情况下在较高盐浓度下的解离。在含有最佳 PC 浓度的增塑聚合物电解质的情况下，在室温下观察到的最大离子电导率为 1.40 × 10-4 S cm-1，从而保持机械稳定性和柔韧性。1H 和 19F 核磁共振 (NMR) 也研究了线宽随温度的变化，这证实了阳离子和阴离子在这些聚合物电解质中都是可移动的。与玻璃化转变温度 (T g; 对于含有具有最佳电导率值的 PC 的增塑聚合物电解质，也观察到 PEO 的低迁移率区域）和熔化温度（T m；高迁移率区域）。电导率与温度变化的研究揭示了在含有高介电常数增塑剂的增塑聚合物电解质的情况下曲线的弯曲性质，这对于它们的无定形性质很重要。在具有最佳电导率值的增塑聚合物电解质的情况下观察到的光滑形态是聚合物电解质适用于实际应用的关键因素。电导率与温度变化的研究揭示了在含有高介电常数增塑剂的增塑聚合物电解质的情况下曲线的弯曲性质，这对于它们的无定形性质很重要。在具有最佳电导率值的增塑聚合物电解质的情况下观察到的光滑形态是聚合物电解质适用于实际应用的关键因素。电导率与温度变化的研究揭示了在含有高介电常数增塑剂的增塑聚合物电解质的情况下曲线的弯曲性质，这对于它们的无定形性质很重要。在具有最佳电导率值的增塑聚合物电解质的情况下观察到的光滑形态是聚合物电解质适用于实际应用的关键因素。