2,2'-Azobisisobutyronitrile

Technical Data

PROPERTIES	UNIT	SPECIFICATION	TYPICAL VALUE
Appearance	-	White Crystal or Crystalline Powder	White Crystal
Purity	wt%	99.00 min	99.31
Melting Point	℃	100.0-103.0	101.2
Color Point	-	10/10g max	3/10g
Insoluble in Methanol	%	0.01 max	0.006
Loss on drying	wt%	0.1 max	0.09
Heavy Metal (as Pb)	%	0.0005 max	0.00028
Fe	wt%	0.0002 max	0.00017
CI-	wt%	0.003 max	0.0016

Products Description

What is AIBN used for? What is the use of Azobisisobutyronitrile? AIBN is used as a initiator for PVC(polyvinyl chloride), PVA(polyvinyl alcohol), Polyacrylonitrile(polyacrylonitrile).

UN 3234 Hazard Class 4.1 PackingGroup II

Product names in Market:

2,2'-Azobisisobutyronitrile, Azobisisobutyronitrile
AIBN initiator, AIBN, Free radical initiator

2 2'-azobis(2-methylpropionitrile), α,α′-Azoisobutyronitrile

What is the CAS number of AIBN? AIBN CAS number is 78-67-1
What is the mechanism of AIBN degradation?

The degradation mechanism of AIBN is a thermal homolytic cleavage process, which generates free radicals and inert byproducts. This mechanism is central to its role as a radical initiator in polymerization reactions.

Molecular Formula: C8H12N4

Molecular structure
Molecular Weight: 164.2

EINECS: 201-132-3

Chemical Name: 2,2'-Azobisisobutyronitrile

Melting point: 100°C-103°C

AIBN Boiling point: 281.68 °C

AIBN Density: 1.11 g/mL at 20 °C(lit.)

Flash point: 64 °C

Is AIBN toxic? AIBN is toxic and with health risks. Its toxicity is associated with its cyano group(-CN) and metabolic byproducts.
What is 2,2'- azodiisobutyramidine dihydrochloride? 2,2'-Azodiisobutyramidine dihydrochloride, is a water-soluble azo initiator. It is widely used in the aqueous solution polymerization and emulsion polymerization of water-soluble vinyl monomers, such as the polymerization of acrylamide, acrylic acid and its derivatives.

Applications

Azobisisobutyronitrile (AIBN) is a widely used organic compound, as a radical initiator.

The use of Azobisisobutyronitrile (AIBN) in details:

Polymerization initiator:Used as a radical initiator in polymerization reactions, such as the polymerization of vinyl monomers (e.g., styrene, acrylonitrile, vinyl chloride, and methyl methacrylate).

Cross-linking Reactions: Used in cross-linking processes for polymers like rubber and plastics, helping to improve material strength, heat resistance, and chemical stability.

Organic Synthesis: Used as radical intermediates for halogenation, oxidation, and cyclization reactions.

Foaming Agent: Used as a foaming agent in the production of plastic foams, where its decomposition releases nitrogen gas to create a porous structure.

The advantages of Azobisisobutyronitrile (AIBN)

Mild Decomposition Temperature: AIBN decomposes at a moderate temperature range (typically 65–85°C), which is lower than many other initiators. This allows for better control over polymerization reactions, reducing the risk of side reactions caused by excessive heat.

Clean Decomposition Products: AIBN produces nitrogen gas and two isobutyronitrile radicals during decomposing. The nitrogen gas byproduct is inert and does not contaminate the reaction system, making it suitable for processes requiring high-purity polymers.

Controllable Reaction Kinetics: Its decomposition rate is stable and predictable, enabling precise control over the polymerization rate and molecular weight distribution of the resulting polymers.

Low Sensitivity to Oxygen and Water: AIBN is less sensitive to oxygen and water, reducing the need for strict anaerobic or anhydrous conditions.