O(4-t-Butylazo-4-cyanopentanoyl) O'-propionyl peroxide and O, O[4,4'-a
zo-bis(4-cyanopentanoyl)] O',O'-dipropionyl diperoxide have been synth
esized and characterized by IR and H-1-NMR. The new azo-diacyl peroxid
es have been tested, comparatively with monofunctional initiators, in
the initiation of radicalic polymerization of some vinylic monomers.