n-Dodecyl Mercaptan (n-DDM)
CAS Number: 112-55-0
n-Dodecyl mercaptan (n-DDM) is the most widely used chain transfer agent in free-radical polymerization, employed to control molecular weight in emulsion and solution polymerization of styrene, acrylics, and SBR rubber. Its thiol group transfers a hydrogen radical to the growing polymer chain, terminating it and starting a new chain at the sulfur center.
Technical Specifications
| appearance | Colorless to pale yellow transparent liquid |
| purity (%) | ≥98.0 |
| color (APHA) | ≤20 |
| thiol content (%) | ≥17.0 |
| water content (%) | ≤0.1 |
Applications
- Molecular weight control in SBR and NBR emulsion polymerization
- Acrylic resin molecular weight regulation for coatings and adhesives
- Polystyrene and ABS suspension polymerization MW control
- Synthesis of telechelic thiol-terminated oligomers
- Preparation of low-MW polymer dispersants for inks and coatings
Key Features
- High chain transfer constant (Cs~18 in styrene) enables efficient MW control at low loadings
- C12 chain length provides enough hydrophobicity for efficient partitioning into monomer phase
- Low color ensures minimal discoloration of finished polymer products
- Industry benchmark with extensive kinetic data for predictable polymerization modeling
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CAS Number
112-55-0
Category
Polymer Synthesis ChemicalsAvailability
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