Azonitriles 2,2’-azobis

Another macroinitiator of this type is azonitrile formed by the condensation of 4,4 -azobis-4-cyanovaleryl chloride with polyoxirane... 

The propagating radical of dialkyl itaconate in the homogeneous polymerization was foimd by Sato et al. to be stable enough to be observed by ESR even above 60 °C. Fig. 62 a displays the 5-line spectra obtained when dimethyl 2,2 -azobis-isobutyrate, benzoylperoxide, and di-tert-butylperoxide were used as initiators. On the other hand, the polymerization of DBI initiated with azonitriles such as 2,2 -azobisisobutyronitrile, 2,2 -azobis(2,4-dimethylvaleronitrile), and cyclohexanecarbo-... 

Regarding azonitriles, the famous thermal initiator 2,2 -azobisisobu-tyronitrile (AIBN) has also shown some potential for photochemical initiation. It was used to polymerize vinyl acetate [102-104], styrene [103,105], vinyl chloride [106], methyl methacrylate [103], and acrylonitrile [107]. Also of certain interest as photoinitiators for vinyl polymerization are a-azobis-1-cyclohexanecarbonitrile [108-110] and l, l -azodicyclohexanecarboni-trile [111]. 

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