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Hexamethylenediamine (MF: C₆H₁₆N₂; MW: 116.2) is an important aliphatic diamine primarily used as a monomer in the synthesis of polymeric materials. It is a straight-chain alkane derivative bearing two amino groups (-NH₂), positioned at opposite ends of the carbon chain. Industrially, hexamethylene diamine is primarily produced via the hydrogenation of adiponitrile, serving as a core raw material for manufacturing key polymeric materials such as nylon 66.
| Item | Specification |
| Melting point | 42–45°C (lit.) |
| Boiling point | 204–205°C |
| Density | 0.89 g/mL at 25°C (lit.) |
| Vapour density | 4 (vs air) |
| Vapour pressure | 0.25 hPa (20°C) |
| Refractive index | n₂₀/D 1.439 (lit.) |
| Flash point | 201°F |
| Acidity constant (pKa) | 11.857 (at 0°C) |
| Odour | Possesses a faint ammoniacal odour |
| Solubility | Freely soluble in water; also soluble in ethanol, diethyl ether and most organic solvents. |
Used in the synthesis of nylon 66, which is the primary application of hexamethylenediamine. Nylon 66 is extensively employed in the manufacture of textile fibres and engineering plastics.
Hexamethylenediamine serves as a room-temperature curing agent for epoxy resins, finding application in adhesives, coatings, and composite materials.
Reacts with fatty acids to form fatty amides, serving as surface treatment agents for fibres or metals to enhance lubricity, adhesion, or antistatic properties.
Functions as a chain extender in synthesising polyurethane elastomers, polyamide hot-melt adhesives, and similar materials.
Acts as an organic synthesis intermediate for producing dyes, pharmaceuticals, and other fine chemicals.
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