Thermal degradation kinetics and solid state, temperature dependent, electrical conductivity of charge-transfer complex of phenothiazine with chloranil and picric acid

Abstract

Temperature dependent electrical conductivity and thermal degradation kinetics of charge-transfer (C-T) complexes of phenothiazine (PTZ) with p-chloranil (CHL) and picric acid (PA), are reported. These C-T complexes exhibited semiconducting behaviour. The activation energies for PTZ-CHL and PTZ-PA complexes are calculated based on their electrical conductivities measured over the temperature ranges 30-110°C and 30-90°C, respectively. And these energies for PTZ-CHL and PTZ-PA are 0⋅54 eV and 0⋅75 eV, respectively. The complexes are analysed for the kinetic parameters like the activation energy for decomposition and the Arrhenius pre-exponential factors in their pyrolysis region using Broido's, Coats-Redfern as well as Horowitz-Metzger methods. Using standard equations, thermodynamic parameters such as enthalpy, entropy and free energies, are calculated.

Development of epoxy‐cyanate ester‐clay nanocomposites offering enhanced thermally stability

“…When the Coats–Redfern model was used n = 1 was considered for the activation energy calculations . Thus, linear plots were obtained using Broido's method (plotting ln(ln 1/y) versus reciprocal of the absolute temperature), the X‐R method (In[− (1 – y )/ T 2 ] versus reciprocal temperature), and the C‐R method and ((1 – y ) vs reciprocal temperature) for major degradation events . The kinetic analysis for the thermal degradation of both Ep‐Cy and Ep‐Cy‐Nc systems using the Horowitz–Metger model is shown in Figure (and the kinetic parameters determined from all models are summarized in Table ).…”

Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

“…From Table 5 and The resulting donor-acceptor solution in methanol and in acetone exhibit appreciable conductivity which may be explained by the possible formation of charge-transfer complex between the donor and acceptor in solution [59,60].…”

Examining the thermal degradation behaviour of a series of cyanate ester homopolymers

“…These values obtained for all the neat resins are higher than the values that have been previously reported for a bisphenol E cyanate ester based on bisphenol E, 2,2′‐bis(4‐cyanatophenyl)ethylidene (67 kJ mol –1 ), and a cyanate ester functional benzoxazine (100 kJ mol –1 ) . Within the dataset, the highest activation energies calculated for the thermal degradation of the homopolymers were obtained for the sulfur‐containing functionalized cyanate monomers (DCTDP and DCDPS).…”