What is "azobisisobutyronitrile"

n. (context organic compound English) An organic compound often used as a foamer in plastics and rubber and as a radical initiator.

Azobisisobutyronitrile (abbreviated AIBN) is an organic compound with the formula [(CH)C(CN)]N. This white powder is soluble in alcohols and common organic solvents but is insoluble in water. It is often used as a foamer in plastics and rubber and as a radical initiator.