4,4′-diaminodimethane overview 4,4′-diaminodiphenylmethane (4,4′-diaminodiphenylmethane, referred to as mda) is an important organic compound and is widely used in high-performance composite materials, plastics, rubbers and coatings. the molecular structure of mda is connected by two rings through a methylene group, each with an amino functional group on each ring, and the chemical formula is c13h14n2. this...