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Spin-Probe ESR Studies on Nanocomposite Polymer Electrolytes

机译:纳米复合聚合物电解质的自旋探针ESR研究

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摘要

The possibility of using spin-probe electron spin resonance (ESR) as a tool to study glass transition temperature, T g, of polymer electrolytes is explored in 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL)-doped composite polymer electrolyte (PEG)46LiClO4 dispersed with nanoparticles of hydrotalcite. The T g is estimated from the measured values of T 50G, the temperature at which the extrema separation 2A zz of the broad powder spectrum decreases to 50 G. In another method, the correlation time τc for the spin probe dynamics was determined by computer simulation of the ESR spectra and T g has been identified as the temperature at which τc begins to show temperature dependence. While both methods give values of T g close to those obtained from differential scanning calorimetry, it is concluded that more work is required to establish spin-probe ESR as a reliable technique for the determination of T g.
机译:在4-羟基-2,2,6,6-中探索了使用自旋探针电子自旋共振(ESR)作为研究聚合物电解质的玻璃化转变温度T g 的可能性。掺有四甲基哌啶-N-氧基(TEMPOL)的复合聚合物电解质(PEG) 46 LiClO 4 分散有水滑石纳米颗粒。 T g 由T 50G 的测量值估算,宽粉末光谱的极值分离2A zz 降低至50G。在另一种方法中,通过计算机模拟ESR光谱确定自旋探针动力学的相关时间τ c ,并且已将T g 标识为温度哪个τ c 开始表现出温度依赖性。虽然两种方法的T g 值都接近于差示扫描量热法获得的值,但得出的结论是,建立自旋探针ESR作为确定T 的可靠技术还需要做更多的工作。 g

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