A ki netic stud y on melti ngof diphenylamine by therm ogravimetric analysis

Many transformation s may occur when a so lid sample is heated, s uch as: melting, sublim ation, polymor phic transfo rmation, or degradation [۱]. The most widely used stabiliz ers are fro m the classes o f (a) arom atic amines and (b) urea derivatives.Example s for (a) are diphenylamine (DPA), ۲-nitro-diphenylamine (۲-NDPA), p-itro-N-ethylaniline (pN EA), p-nitro-N-methyla niline (pNMA) and for (b) akardite-II(۱-ethyl-۳, ۳-diphenylurea; AKA-II) and ethyl centralite (۱, ۳-diethyl-۱, ۳-dipheny lurea, EC) [۲].Our aim was to evaluate thermal experimental data of diphenylamine via th ermogravim etricanalysis (TGA) by applying w ell known kinetic equa tions such as the Coats-Redfern kinetic equation and also Friedman, Flynn– Wall–Ozawa and Kissinger–Akahira–S unose kinetic equation at various s canning rates. Some parameters such as activatio n energy, fre quency factor and also model of degradation w ere determined [۳].

کلیدواژه ها:

Diphenylamine ، Non-isothermal ، Thermogra vimetric analysis ، Kineti cs study.