Abstract The electrical properties of polymeric films/blends comprising polyaniline (PANI) and cashew gum (CG) blends were studied by impedance spectroscopy in the temperature range from 300 K to 353 K. Protonation promoted by sulfuric acid was responsible for changing the oxidation state from undoped emeraldine base (EB) to doped emeraldine salt (ES). The low-frequency conductivity of the films varied more than 6 orders of magnitude by doping. In (PANI- EB)/CG blends, the presence of cashew gum acts a dispersing agent, lowering the electrical conductivity contrasting to (PANI-ES)/CG blends, where the electrical conductivity increases with CG concentration up to 20% (w/w). Moreover, undoped films presented a thermally-activated electrical conductivity, whereas doped films presented a decrease in the conductivity by increasing temperature. An equivalent circuit model is proposed to analyze the data by considering the system being composed of highly conductive regions separated by insulating/semiconducting ones.

中文翻译：

---

温度对聚苯胺/腰果胶混合物电导率的影响

摘要 通过阻抗谱研究了包含聚苯胺 (PANI) 和腰果胶 (CG) 共混物的聚合物薄膜/共混物在 300 K 至 353 K 温度范围内的电性能。硫酸促进的质子化是改变氧化态的原因未掺杂的祖母绿碱 (EB) 到掺杂的祖母绿盐 (ES)。通过掺杂，薄膜的低频电导率变化超过 6 个数量级。在 (PANI-EB)/CG 混合物中，腰果胶的存在充当分散剂，与 (PANI-ES)/CG 混合物相比，腰果胶的存在降低了电导率，其中电导率随 CG 浓度增加至 20% (w/ w)。此外，未掺杂的薄膜呈现出热激活的导电性，而掺杂的薄膜呈现出随着温度升高而降低的导电性。