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Octadecanethiol is an alkyl mercaptan compound derived from octadecane, with the molecular formula C₁₈H₃₈S and a molecular weight of 286.56. It serves as an important surface modifier and fine chemical raw material, as well as a metal treatment agent, rubber additive, and organic synthesis intermediate. Its molecular structure contains a long-chain alkyl group and a sulfhydryl group (-SH), endowing it with excellent metal adsorption properties, good fat solubility, and chemical stability. It is widely used in various fields, including precious metal surface treatment, nanomaterials, rubber vulcanization, and lubricant additives.
| Item | Specification |
| Melting Point | 30–33°C |
| Boiling Point | 388°C (at atmospheric pressure) |
| Density | 0.847 |
| Vapor pressure | Low; negligible at room temperature |
| Refractive index | 1.463 |
| Flash point | 185°C |
| Solubility | Insoluble in water; readily soluble in organic solvents such as ethanol, diethyl ether, and benzene. |
| Acidity coefficient | Weakly acidic; pKa approximately 10.5. |
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