tert-Dodecyl Mercaptan (t-DDM)
CAS Number: 25103-58-6
tert-Dodecyl mercaptan (t-DDM) is a branched-chain thiol chain transfer agent with a higher chain transfer constant than n-DDM, allowing molecular weight control at lower dosing levels. Its branched structure increases the rate of chain transfer and is preferred in emulsion polymerization of styrene-butadiene, acrylics, and nitrile rubber where low residual CTA level is critical.
Technical Specifications
| appearance | Colorless to pale yellow transparent liquid |
| purity (%) | ≥98.0 |
| color (APHA) | ≤20 |
| thiol content (%) | ≥16.5 |
| water content (%) | ≤0.1 |
Applications
- SBR and NBR emulsion polymerization with low residual thiol
- High-performance acrylic resin synthesis with precise MW targeting
- ABS and HIPS graft polymerization molecular weight control
- Low-odor polymer production for food-contact and medical applications
- Synthesis of narrow-dispersity polymers for analytical standards
Key Features
- Higher chain transfer constant than n-DDM enables precise MW control at lower dosage
- Branched structure results in lower residual thiol odor in finished polymer
- Reduced chain end crystallinity from branched terminus improves latex film properties
- Preferred by major synthetic rubber producers for consistent Mooney viscosity targeting
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CAS Number
25103-58-6
Category
Polymer Synthesis ChemicalsAvailability
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