⭐ What Is TDM (Tertiary Dodecyl Mercaptan)?

Tertiary Dodecyl Mercaptan (TDM) is a long-chain thiol (mercaptan) compound and a highly important chain transfer agent used in free-radical polymerization processes.

While it serves the same purpose as NDM (Normal Dodecyl Mercaptan), TDM provides more controlled chain transfer, lower odor, and more stable reaction performance.

TDM is especially critical in the production of SBR (Styrene–Butadiene Rubber).

🔧 What Is TDM Used For?

The primary function of TDM is to control chain transfer reactions during polymerization.

Key contributions:

✔ 1. Controls Polymer Molecular Weight

By regulating radical transfer, TDM:

• Determines polymer chain length
• Reduces molecular weight
• Produces more uniform polymer structures

✔ 2. Improves Processability

Provides lower viscosity and better mixing behavior.

✔ 3. Enhances Flexibility and Softness in Rubber

Helps achieve the desired hardness/flexibility balance in SBR and other elastomers.

✔ 4. Enables Controlled Polymerization

Reduces unwanted side reactions and stabilizes production.

✔ 5. Improves Final Product Quality

Results in more consistent and predictable mechanical properties.

🎯 Purposes of TDM

✔ 1. SBR (Styrene–Butadiene Rubber) Production – Primary Application

TDM is widely used to:

• Control molecular weight
• Improve elasticity and strength
• Enhance processing performance

This makes it extremely valuable in the tire and rubber industry.

✔ 2. ABS Resin Production

Improves flow behavior and impact resistance in ABS polymers.

✔ 3. Emulsion & Solution Polymerization

Used in:

• Acrylic polymers
• Vinyl acetate copolymers
• Methacrylate polymers

✔ 4. Thermoplastic Elastomers

Helps produce flexible, durable elastomeric materials.

✔ 5. Latex Production

Improves particle size control and stability in latex formulations.

🏭 Industries That Use TDM

• Tire & automotive rubber industry
• ABS & plastic manufacturers
• Latex and emulsion polymer producers
• Adhesive & resin manufacturers
• Rubber modification facilities
• Footwear sole & elastomer product manufacturers

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