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...