background and importance of 4,4′-diaminodimethane 4,4′-diaminodimethane (mda, methylene dianiline) is an important organic compound with the chemical formula c13h12n2. it is widely used in many industrial fields, especially in high-performance polymers, composite materials and specialty coatings. one of the main uses of mda is to act as a curing agent for polyurethane and epoxy resins,...