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Azobisisobutyronitrile
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Category:
Specialty Chemicals
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Product Profile
2,2′-Azobis(2-methylpropionitrile) (AIBN)
CAS No.: 78-67-1
Synonyms / IUPAC Name: 2,2′-Azobis(2-methylpropionitrile), AIBN
Molecular Formula: C₈H₁₂N₄
Molecular Weight: 164.21 g/mol
Physicochemical Properties (Typical)
- Appearance: White crystalline powder
- Odor: Essentially odorless
- Melting Point: 102–104 °C (decomposition begins)
- Boiling Point: Decomposes before boiling
- Density: ~ 1.11 g/cm³
- Solubility: Insoluble in water; soluble in common organic solvents (alcohols, ethers, acetone, etc.)
- Stability: Stable under cool, dry, dark conditions; decomposes on heating, friction, or shock
- Decomposition Behavior: At ~ 65–70 °C, decomposes to release nitrogen and generate free radicals
Purity & Quality Standards
- Purity (by GC / other): ≥ 98.0%
- Moisture / Water Content: ≤ 0.5%
- Residual Solvents / Impurities: Strictly controlled
- Heavy Metals: ≤ 0.001%
- Analytical Methods: Gas chromatography, spectroscopy
- Documentation: Certificate of Analysis (COA) and Safety Data Sheet (SDS) available
Applications / Uses
- Radical initiator for polymerization (vinyl monomers, acrylates, etc.)
- Blowing agent in plastics and rubber foam processes
- Initiator in chemical synthesis and crosslinking reactions
- Utility in radical-mediated reactions (grafting, curing)
Safety & Handling
- Hazard Classification: Self-reactive substance; may cause fire or explosion on heating
- Health Hazards: Harmful by inhalation or swallowing; may cause organ damage with prolonged exposure
- Fire / Explosion Risks: Dust may form explosive mixtures with air; decomposition is exothermic
- Handling Precautions:
- Use in well-ventilated areas
- Avoid heat, sparks, friction, impact
- Wear gloves, goggles, protective clothing
- Use explosion-proof equipment
- Incompatibilities: Strong oxidizers, acids, bases, metal salts
- First Aid:
- Inhalation – Move to fresh air
- Skin – Wash with water
- Eyes – Rinse thoroughly with water
- Ingestion – Seek medical attention
Packaging & Storage
- Packaging: Sealed, inert containers (e.g. metal or lined containers)
- Storage Conditions: Cool, dry, dark, and well-ventilated area, away from heat sources
- Container Closure: Keep tightly closed; protect from light and moisture
- Storage Temperature: Generally recommended below 10 °C
- Shelf Life: 12–24 months under proper storage