Azobisisobutyronitrile

• 2,2 '- azobis (2- methylpropionitrile )
• Azobisisobutyronitrile
• AIBN

Colorless to gray, water-insoluble, odorless powder or crystalline solid

Fixed

1.11 g · cm -3

105 ° C.

• Insoluble in water
• Soluble in organic solvents and vinyl monomers

Risk

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AIBN is the short name of the chemical compound azobis ( isobutyronitrile), one of the classes of azo compounds and nitriles. It is used in the organic chemistry as an initiator for the free radical chain reaction in the production of plastics.

Preparation and Properties

AIBN is made from acetone and hydrazine; the resulting by condensation of 1,2- bis-(2 - Methylpropionitrilo -2 -yl ) hydrazine and then oxidized to AIBN ( for example, chlorine). Because of the toxicity of the decomposition product Tetramethylbernsteinsäuredinitril it is not used in industrial plants. AIBN is a colorless to gray, odorless, water-insoluble powder which can be dissolved in organic solvents, and vinyl monomers. Depending on the method of presentation is also produced a finely crystalline white solid.

AIBN decomposes above a temperature of about 25 ° C with evolution of molecular nitrogen in two isobutyronitrile radicals. The formation of nitrogen provides the necessary driving force for the decomposition reaction. This decay can already be done by impact or friction.