⭐ What Is NDM (Normal Dodecyl Mercaptan)?

Normal Dodecyl Mercaptan (NDM) is a long-chain thiol (mercaptan) compound.
Its chemical formula is C₁₂H₂₅SH, and it is primarily used as a chain transfer agent in free-radical polymerization processes.

NDM is essential for controlling polymer molecular weight and achieving desired mechanical properties.

🔧 What Is NDM Used For?

NDM’s main function is to act as a chain transfer agent.

Key contributions include:

✔ 1. Controls Polymer Chain Length

During radical polymerization, NDM transfers the active chain end, helping to:

• Reduce molecular weight
• Adjust chain length
• Produce more controlled polymer structures

✔ 2. Improves Processability

Lowers viscosity and enhances the processing behavior of polymers.

✔ 3. Produces Softer & More Flexible Polymers

Especially beneficial in SBR and elastomer applications.

✔ 4. Enables Controlled Polymerization

Reduces unwanted side reactions and ensures more uniform polymer production.

✔ 5. Enhances Rubber Performance

Helps achieve better mechanical control in elastomers.

🎯 Purposes of NDM

✔ 1. SBR (Styrene–Butadiene Rubber) Production

This is the most common application.
NDM helps:

• Control molecular weight
• Increase flexibility
• Improve processability

✔ 2. ABS Resin Production

NDM improves flow, toughness, and process stability in ABS polymers.

✔ 3. Emulsion Polymerization

Used as a chain transfer agent in:

• Acrylic polymers
• Vinyl acetate copolymers
• Methacrylate polymers

✔ 4. Latex Production

Enhances stability and polymer structure control in latex formulations.

✔ 5. Thermoplastic Elastomers

Used where flexibility and durability are required.

🏭 Industries That Use NDM

• Rubber & elastomer manufacturers
• ABS & plastic producers
• Adhesive & resin formulators
• Automotive tire & parts production
• Paint & coating chemicals (latex systems)
• Footwear sole & elastomer product manufacturers

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