Лако-красочные материалы — производство

Certain peroxides and azo compounds decompose when heated to give free radicals. This decomposition can occur in a single step:

CH3 CH3 CH3

I I heat I.

C6H5— С — О — О— С — CeH5 —————— ► 2С6Н5— с — о

I I I

сн3 сн3 сн3

cumyl radical

Figure 1-69

or by a two stage process:

Figure 1-70

The ratio of benzoate to phenyl radicals depends upon the reaction conditions, and in particular the reactivity of the monomers present.

Azo compounds also decompose in a similar manner, as shown by azo di-isobutyronitrile (AZDN).