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Normal Dodecyl Mercaptan (n-Dodecyl Mercaptan, DDM) refers to a linear C₁₂ alkanethiol (CH₃–(CH₂)₁₁–SH) produced primarily via thiol–ene addition between hydrogen sulfide and linear α-olefins, yielding a high-purity, straight-chain thiol with a reactive sulfhydryl group. It is a key chain-transfer agent in free-radical polymerization, particularly in emulsion and solution processes for styrene–butadiene rubber (SBR), acrylonitrile–butadiene rubber (NBR), ABS resins, and related copolymers, where it provides precise regulation of molecular weight, molecular weight distribution, and polymer branching. DDM exhibits characteristic properties including high hydrophobicity, moderate boiling point, strong thiol reactivity, and a distinct sulfur odor, and requires controlled handling to manage volatility, oxidation sensitivity, and odor emissions. Its industrial role centers on enabling fine-tuned polymer microstructure, viscosity control, and process stability in elastomer and engineering plastics production.
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