⭐ What Is AIBN (Azobisisobutyronitrile)?

AIBN (Azobisisobutyronitrile) is a highly important free-radical initiator used in organic chemistry and polymer chemistry.
When heated, it decomposes and produces free radicals, which initiate polymerization reactions.

AIBN is commonly used for the polymerization of PVC, acrylics, vinyl monomers, and styrene-based systems.

🔧 What Is AIBN Used For?

The primary function of AIBN is to initiate free-radical polymerization.

When heated, AIBN undergoes two key processes:

✔ 1. Produces Free Radicals

AIBN decomposes, releasing nitrogen gas (N₂) and forming stable free radicals.
These radicals attack monomers and start polymer chain growth.

✔ 2. Enables Controlled Polymerization

AIBN provides stable, predictable initiation and is preferred for controlled chain propagation.

✔ 3. Produces Fewer Odorous Byproducts

Compared to alternatives like benzoyl peroxide, AIBN generates cleaner byproducts.

🎯 Purposes of AIBN

✔ 1. Initiating Free-Radical Polymerization

AIBN is widely used in the production of:

• PMMA (Acrylic/Plexiglass)
• PVC
• PVA
• Vinyl acetate polymers
• Styrene–butadiene polymers
• Acrylic elastomers

✔ 2. Foam Production

Since AIBN releases nitrogen gas upon decomposition, it acts as a blowing agent in certain polymer foams.

✔ 3. Polymer Modification

Used for chain-transfer, grafting, and structural modification of polymers.

✔ 4. Organic Synthesis

AIBN is used in radical-mediated reactions such as:

• Radical addition reactions
• Redox systems
• Controlled polymer synthesis

🏭 Industries That Use AIBN

• Plastic & polymer manufacturing
• Paints & coatings
• Adhesive production
• Rubber & elastomer modification
• Organic chemistry laboratories
• Thermoplastic & thermoset manufacturing

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