Stability of polyaniline synthesized by a doping-dedoping-redoping method

Abstract

Stability, including thermal stability, conductivity stability in air and after thermal treatment (100 -200°C), of the polyaniline (PANI) films synthesized by a doping-dedoping-redoping method was investigated. It was found that thermogravimetric analysis (TGA) curves undergo three steps: loss of water or solvent, dedoping and decomposition, and those depend on the counterions. Compared with PANI films doped with camphor sulfonic acid (CSA) in m-cresol, the thermal stability of the doped PANI films is improved by the new method, and thermal stability in the order of PANI-H 3 PO 4 Ͼ PANI-p-TSA Ͼ PANI-H 2 SO 4 Ͼ PANI-HCl, PANI-HClO 4 Ͼ PANI-CSA was observed. The conductivity of the doped PANI films at room temperature was reduced after thermal treatment, and it is dependent of the counterions. It was found that the conductivity stability of PANI-p-TSA and PANI-CSA is the best below 200°C. When the doped PANI films were placed in air, their conductivity decrease slowly with time due to deproton, and also depends on the counterions.

Electrospun nanofibrous membranes embedded with aerogel for advanced thermal and transport properties

“…On the other hand, PUR nanofibrous membranes embedded with and without aerogel present considerable weight loss than PVDF nanofibrous membranes. Above 420°C, the weight loss was associated with the degradation of the polymer chain structure, in agreement with previous literature . The analysis shows that the blends in the compositions studied have a stability that is closest to the stability of PVDF, with an intensive weight loss onset at around 400°C.…”

Polyaniline Conducting Electroactive Polymers Thermal and Environmental Stability Studies

“…It has been reported 59,60 that longer heat treatment time of PANi-EB leads to more pronounced cross-linking which in turn lead to reduced solubility of the polymer and to reduced conductivity recovering after post treatment in acids. This originates in fewer imine N atoms being available for reprotonation.…”

Electrorheological properties of polyaniline suspensions: Field-induced liquid to solid transition and residual gel structure

“…The TGA thermogram of PANI powder measured under N 2 atmosphere shows a 3.15% weight loss at a temperature between 49.6 and 100 • C, indicative of the evaporation of residual solvent [23].…”