ABSTRACT
Products of transformation of nitrene radicals formed during decomposition of aromatic azides can initiate radical polymerization. This fact has been found firstly for carbonyl-containing azides, such as derivatives of acetophenone, xanthone, fluorane, anthraquinone, phenylphthalimides, etc. Diazides are more effective than monoazides as a rule. For some diazides double step mechanism of photoinitiation due to the direct energy supply (intramolecular transfer) for differently positioned azidogroups with different values of photolysis quantum yields have been recently found.
Reaction of alkyl diamines with diazonium salts passes through two steps. Monopentazenes were found to be obtained as the first step of the reaction and after as the second step new type of organic compounds–bis-pentazadienes, can be obtained. Mono- and bis-pentazadienes can produce free radicals of several kinds due to cleavage of chromophore pentazadiene group. Therefore, they can initiate multistep polymerization processes.
