p-Phenylenediamine
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![Molecular structure of Kevlar: the monomer subunit is bolded, dashed lines indicate hydrogen bonds.](/Images/godic/202502/01/Kevlar_chemical_structure_H-bonds4835.png")
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p-Phenylenediamine (PPD) is an organic compound with the formula C6H4(NH2)2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. It is mainly used as a component of engineering polymers and composites. It is also an ingredient in hair dyes.