The thermal decomposition of 2,2′‐azobis‐(2‐methyl‐5‐hydroxy‐valeronitril) and its phenyl isocyanate derivative

The thermal decomposition kinetics of 2,2′‐azo‐bis‐(2‐methyl‐5‐hydroxy‐valeronitrile) was studied in siobutyl methyl ketone, 1,4‐dioxane and cyclohexanone at 61, 71, and 81°C by applying ultraviolet absorption technique. The thermal decomposition of the phenyl isocyanate capped product of this azo‐compound was also studied in isobutyl methyl ketone at the same three temperatures. The overall rate expressions for decomposition of these azo‐initiators in various solvents are reported.