Diamine

A diamine is a type of polyamine with exactly two amino groups. Diamines are mainly used as monomers to prepare polyamides, polyimides and polyureas. In terms of quantities produced, 1,6-diaminohexane, a precursor to Nylon 6-6, is most important, followed by ethylenediamine. Hydrazine (H₂NNH₂) is usually not considered a diamine since it is neither an amine nor is it dibasic.