Evaluation on thermal stability and kinetics of 2,2′-azobis(2,4-dimethyl)valeronitrile in aerobic and anaerobic conditions under isothermal process

Abstract

We quantified the thermal stability of 2,2′-azobis(2,4-dimethyl)valeronitrile (ADVN) under isothermal conditions through thermogravimetry (TG), differential scanning calorimetry (DSC), and model-free as well as model-fitting methods. We selected two gaseous atmospheres—N2 and air—to observe the thermal degradation behaviors of ADVN with or without O2 by TG. The results showed that when oxygen was present, the mass loss and thermal degradation rate of ADVN decreased because of azoxy compounds production. In addition, the thermal degradation behaviors of ADVN were noticeable at 30 °C, which is close to room temperature. Therefore, storage and transportation of ADVN should be appropriately controlled under low-temperature conditions. Finally, the kinetic behaviors of ADVN were determined using DSC data, model-free, and model-fitting methods under isothermal conditions.