Azobisisobutyronitrile (AIBN)
CAS Number: 78-67-1
Azobisisobutyronitrile (AIBN) is the most widely used azo free-radical initiator for vinyl polymerization in solution, suspension, and bulk processes. It decomposes at 60–80°C to generate isobutyronitrile radicals with no oxygen by-products, making it ideal for oxygen-sensitive formulations and polymerizations where peroxide-induced side reactions must be avoided.
Technical Specifications
| appearance | White crystalline powder |
| purity (%) | ≥98.0 |
| loss on drying (%) | ≤0.5 |
| melting point (°C) | 102–104 (decompose) |
| nitrogen content (%) | 18.5–19.5 |
Applications
- Solution polymerization of acrylic resins and specialty polymers
- Suspension polymerization of PVC, polystyrene, and EPS
- RAFT and ATRP-supplemented controlled radical polymerization
- Blowing agent activation in foamed PVC and rubber compounds
- Free-radical crosslinking of silicone elastomers and rubbers
Key Features
- Clean decomposition generates only carbon-centered radicals with no oxygenated by-products
- Half-life of 10 hours at 64°C enables precise temperature-controlled polymerization
- No metal residues in polymer product — critical for electronic and biomedical grades
- Compatible with all major vinyl and acrylic monomers in solution and suspension processes
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CAS Number
78-67-1
Category
Polymer Synthesis ChemicalsAvailability
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