Free standing and flexible polymer blend films of PPy (poly pyrrole) doped in PVA (poly vinyl alcohol) – PVP (poly vinyl pyrrolidone) matrix with varying concentrations of PPy have been prepared by solution cast technique at room temperature. In-situ polymerization of pyrrole monomer (Py) in PVA-PVP matrix has been carried out using FeCl3 as oxidant. The effect of monomer amount and monomer to oxidant ratio on the dielectric parameters (such as dielectric constant, dielectric loss, loss tangent, ac conductivity, complex electric modulus, complex impedance) of PPy doped PVA-PVP polymer blend films have been studied in the frequency range of 20 Hz to 2 MHz. Two different molar concentrations (0.15 M and 0.30 M) of oxidants have been taken and for each oxidant concentration, four varying concentrations of monomer have been used to optimize the results. The blend films having oxidant to monomer molar concentration ratio of 0.5 in both the cases (i.e. 0.15 M and 0.30 M) have been found to be smooth, flexible, mechanically strong and easy to process. These films have shown very systematic change and improved values of dielectric parameters within the experimental frequency range. Enhanced dielectric parameters (complex permittivity, ac conductivity and electric modulus) values for films having oxidant to monomer molar ratio of 0.5 suggest the organized growth of PPy chain in the matrix of PVA-PVP.

中文翻译：

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PVA-PVP基质中吡咯的原位聚合：氧化剂/单体比的优化及其对聚合物共混膜介电性能的影响

在室温下通过溶液流延技术制备了掺杂有PVA（聚乙烯醇）-PVP（聚乙烯吡咯烷酮）基质的PPy（聚吡咯）的自立且柔性的聚合物共混膜，并具有不同的PPy浓度。使用FeCl3作为氧化剂，在PVA-PVP基质中进行了吡咯单体（Py）的原位聚合。研究了单体量和单体与氧化剂的比例对PPy掺杂PVA-PVP聚合物共混膜的介电参数（介电常数，介损，损耗角正切，交流电导率，复电模量，复阻抗）的影响。频率范围为20 Hz至2 MHz。采取了两种不同摩尔浓度的氧化剂（0.15 M和0.30 M），对于每种氧化剂浓度，四种不同浓度的单体已用于优化结果。已经发现在两种情况下（即0.15M和0.30M），氧化剂与单体的摩尔浓度比为0.5的共混膜是光滑的，柔性的，机械强度强的并且易于加工的。这些薄膜在实验频率范围内显示出非常系统的变化和介电参数的改进值。氧化剂与单体的摩尔比为0.5的薄膜的增强的介电参数（复介电常数，交流电导率和电模量）值表明PVA-PVP基质中PPy链的有组织生长。这些薄膜在实验频率范围内显示出非常系统的变化和介电参数的改进值。氧化剂与单体的摩尔比为0.5的薄膜的增强的介电参数（复介电常数，交流电导率和电模量）值表明PVA-PVP基质中PPy链的有组织生长。这些薄膜在实验频率范围内显示出非常系统的变化和介电参数的改进值。氧化剂与单体的摩尔比为0.5的薄膜的增强的介电参数（复介电常数，交流电导率和电模量）值表明PVA-PVP基质中PPy链的有组织生长。