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Sigma-Aldrich™ α,α′-Azoisobutyronitrile (AIBN), 250g
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Specifications:
| Application | Analytical Chemistry, Free Radical Analysis, Organic Synthesis | ||
| Storage Temperature | Ambient | ||
| Product Type | Indicators | Forms | Powder |
| Product Brand | Sigma-Aldrich | ||
| Product Grade | Analytical grade | Formula | (CH₃)₂C(CN)N=NC(CH₃)₂CN |
Sigma-Aldrich™ α,α′-Azoisobutyronitrile (AIBN) is a high-quality free-radical initiator widely used in polymer chemistry, vinyl and acrylate polymerisation, RAFT polymerisation, and a broad range of organic synthesis reactions. AIBN decomposes thermally to generate nitrogen gas and 2-cyanoprop-2-yl radicals, providing a clean, controlled, and reproducible initiation mechanism.
Supplied at high synthesis grade purity, AIBN is widely utilised in academic research, industrial polymer production, materials science, and radical reaction development. Its predictable decomposition behaviour makes it one of the most commonly used azo-initiators in chemistry.
Key Features & Benefits
Highly Efficient Free-Radical Initiator
- Generates predictable radical flux upon thermal decomposition
- Clean by-product profile (releases N₂ gas) with no metal residues
- Provides highly controlled polymerisation kinetics
Widely Used in Polymer Science
-
Ideal for:
• Styrene polymerisation
• Acrylate and methacrylate polymerisation
• RAFT and controlled radical polymerisation
• Copolymer synthesis
• Crosslinked polymer network formation
Reliable Synthesis Grade Quality
- Suitable for demanding organic synthesis
- Stable crystalline solid
- Fully characterised by melting point, structural identifiers, and molecular formula
Application Examples
- Surface coatings and adhesives
- Elastomers and plastics
- Functional polymer materials
- Specialty monomers and resins
- Free-radical modifications of polymers
Chemical & Regulatory Information
| Parameter | Details |
|---|---|
| Chemical Name | α,α′-Azoisobutyronitrile (AIBN) |
| Synonyms | 2,2′-Azobis(2-methylpropionitrile); Azobisisobutyronitrile; Free-radical initiator |
| CAS Number | 78-67-1 |
| Linear Formula | (CH₃)₂C(CN)N=NC(CH₃)₂CN |
| Molecular Weight | 164.21 g/mol |
| MDL Number | MFCD00013808 |
| Beilstein Registry Number | 1708400 |
| PubChem Substance ID | 329749518 |
| Quality Level | 200 (Synthesis grade) |
| UNSPSC Code | 12352200 |
| NACRES Code | NA.22 |
Physical & Analytical Properties
| Property | Value |
|---|---|
| Appearance | White crystalline powder (typical) |
| Melting Point | 102–104 °C (decomposes) |
| Decomposition | Decomposes with nitrogen release |
| Storage | Cool, dry place; tightly closed container |
| Structure (SMILES) | CC(C)(N=NC(C)(C)C#N)C#N |
| InChI | 1S/C8H12N4/c1-7(2,5-9)11-12-8(3,4)6-10/h1-4H3/b12-11+ |
| InChI Key | OZAIFHULBGXAKX-VAWYXSNFSA-N |
Applications
1. Polymerisation Initiator
For:
- Polystyrene
- Polyacrylates and polymethacrylates
- PVC alternatives
- RAFT polymerisation systems
- Block and graft copolymers
2. Organic Synthesis
- Generation of radicals for synthetic transformations
- Radical addition reactions
- Cyclisations, fragmentation reactions, and oxidations
3. Materials Science
- Preparation of functional polymers
- Surface grafting and functional coatings
- Polymer composites and nanomaterials
Ordering Information
| Pack Size | SKU |
|---|---|
| 250 g | 8015950250 |
Sigma-Aldrich™ AIBN is a high-purity, synthesis-grade free-radical initiator essential for polymerisation, organic radical chemistry, and advanced materials development. With well-defined decomposition behaviour and industry-standard quality, it is an indispensable reagent for chemists working in polymer research, industrial resin production, and modern synthesis.