Non-isothermal decomposition kinetics of conductive polyaniline and its derivatives

Abstract

ObstractThe non-isothermal decomposition kinetics of conductive polyaniline (PANI) and its derivatives, poly(o-methoxyaniline) (POMA) and poly(o-ethoxyaniline) (POEA), was investigated by thermogravimetric analysis (TGA), under inert and oxidative atmospheres, using Flynn-Wall-Ozawa's approach to assess the kinetic parameters of the decomposition process. The order of reaction was found to be dependent on the degree of conversion indicating that both the early and the later stages of polymer degradation were next the zero or pseudo zero order kinetics, whereas the intermediate stages follow a first order kinetics. The activation energy was found to be dependent on both the degree of conversion and PANI derivative. Activation energy values vary from 125 to 250 kJ/mol, to decompositions carried out under nitrogen, and 75 to 120 kJ/mol to oxidative atmosphere. Parent PANI presented the best thermal stability and suggesting that thermal stability is also influenced by derivatization and type of atmosphere used.In this work, polyaniline (PANI) and its derivatives, poly(o-metoxyaniline), POMA, and poly(etoxyaniline), POEA, were analyzed by thermogravimetric analysis (TGA) and their kinetics of thermal decomposition was studied by Flynn-Wall-Ozawa's approach to access the kinetics triplet (activation energy, pre-exponential factor and order of reaction) in order to compare the thermal behavior of PANI with its POEA and POMA derivatives.

Triazine‐based mesoporous organic polymers as palladium supports: physicochemical properties, porosity and catalytic performance in Suzuki coupling reaction

“…Thermo‐oxidative stability of polymers is one of the most significant parameters concerning the usefulness of polymers in practical applications requiring air sensitivity 14 . This study evaluated the synthesized polymers' thermal stability using TGA.…”

“…13 Thermal stability of triazine-based polymers Thermo-oxidative stability of polymers is one of the most significant parameters concerning the usefulness of polymers in practical applications requiring air sensitivity. 14 This study evaluated the synthesized polymers' thermal stability using TGA. The TGA thermograms were collected by heating the samples from 30 to 850 °C at a heating rate of 10 °C min −1 under an air atmosphere (Fig.…”

Post-functionalization of Ether-linked Polymer via the Application of Ullmann-coupling Reaction: Synthesis, Characterization and Thermal Degradation Kinetics

“…Thus, the incorporation of aniline groups in PE-Ani-A enriched the polymer structure with higher aromatic and nitrogen contents compared to PE-A. These play a vital role in increasing the rigidity of the polymer and hence its thermal stability [16] . In addition, it is well-known that a higher percent composition of hetero-atoms (nitrogen in this case) plays a significant role in increasing the thermal stability and lowering the rate of the thermal degradation process.…”

“…This variation is related to the changes in the polymer structure and the molecular architecture of the chains [14] . With this respect, more attention is paid to the determination of the activation energy (E a ) of the polymer degradation process which can be extracted from the thermal degradation kinetics monitored by gravimetric analysis measurements (TGA) by applying relevant mathematical models [15][16] .…”

Towards advanced flame retardant organic coatings: Expecting a new function from polyaniline

“…500 °C, whereas mass loss is usually less than 50% until 600-700 °C. Weight loss of PANI under N2 atmosphere continue beyond 700 °C with a slower rate, where even at 1000 °C there are some residue [14]. When a dopant is added to the PNAI, polaron structures are created which are responsible for significant electrical conductivity enhancement [15,16].…”