overview of 4,4′-diaminodimethane (mda) 4,4′-diaminodiphenylmethane (4,4′-diaminodiphenylmethane, referred to as mda) is an important organic compound with the chemical formula c13h14n2. it has a wide range of applications in the industry, especially in the production of polyurethane (pu) materials. as a precursor of diisocyanates (such as mdi), mda is an important raw material for the synthesis...