Diamine monomers are a class of organic compounds containing two amino (–NH₂) functional groups, widely used in the synthesis of high-performance materials such as polyimides, polyureas, and nylon. Their chemical properties mainly depend on the reactivity of the amino groups and the overall molecular structure (aliphatic or aromatic).
Basicity: Amino groups are basic and can react with acids to form salts.
Reactivity: They condense with dicarboxylic acids to form polyamides (such as nylon).
They participate in cross-linking reactions (such as epoxy resin curing).
Diamine monomers with different structures vary significantly in solubility, boiling point, pKa, and stability. For example, aliphatic diamines are generally more soluble in water, while aromatic diamines are more soluble in organic solvents such as DMF and NMP.
