Effects of CdCl2 concentration on the structural, thermal and ionic conductivity properties of HPMC polymer electrolyte films
Effects of CdCl2 concentration on the structural, thermal and ionic conductivity properties of HPMC polymer electrolyte films
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DOI：
10.1007/s11581-014-1151-y
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发表时间：
2015-01-01
期刊：
影响因子：
2.8
通讯作者：
Mahadevaiah
中科院分区：
文献类型：
--
作者：
Rani, N. Sandhya;Sannappa, J.;Mahadevaiah
本文研究了氯化镉（CdCl2）掺杂羟丙基甲基纤维素（HPMC）聚合物电解质薄膜。采用溶液铸法制备了不同浓度CdCl2 （1 ~ 4%, wt.%）与HPMC络合的聚合物电解质样品。采用x射线衍射（XRD）和差示扫描量热法（DSC）对这些聚合物样品进行了结构和热研究。XRD结果表明，随着CdCl2盐浓度的增加，HPMC聚合物基体的非晶态畴增多。DSC结果表明，CdCl2的存在提高了聚合物基体的熔融温度；然而，观察到纯HPMC薄膜的熔合热（δ H (f)）很高。用扫描电镜（SEM）观察了膜形态的变化。在313-383 K的温度范围内测量了直流电导率。电导率的大小随盐浓度和温度的增加而增加。活化能区数据（I区和II区）表明在这些聚合物电解质薄膜中离子型电荷输运占主导地位。当CdCl2浓度为4%时，HPMC聚合物电解质在313 K时结晶度最低，电导率最高，为1.01 × 10(-6) Scm（-1）。
The present study illustrates cadmium chloride (CdCl2)-doped hydroxypropyl methylcellulose (HPMC) polymer electrolyte films. Solution cast method is employed to prepare polymer electrolyte samples of HPMC complexed with various concentrations of CdCl2 (1-4 %, wt.%). Structural and thermal studies of these polymer samples were investigated using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). XRD results showed that the amorphous domains of HPMC polymer matrix were increased with increase in CdCl2 salt concentration. DSC results revealed that the presence of CdCl2 in the polymer matrix increases the melting temperature; however, it is observed that the heat of fusion (Delta H (f) ) is high for pure HPMC films. The variation in the film morphology was examined by scanning electron microscopy (SEM). Direct current (dc) conductivity was measured in the temperature range 313-383 K. The magnitude of electrical conductivity was found to be increased with increasing salt concentration and temperature. The activation energy region data (region I and region II) indicated the dominance of ion-type charge transport in these polymer electrolyte films. HPMC polymer electrolytes with 4 % CdCl2 salt concentration exhibit the least crystallinity and the highest conductivity 1.01 x 10(-6) Scm(-1) at 313 K.