introduction to 4,4′-diaminodimethane 4,4′-diaminodiphenylmethane (4,4′-diaminodiphenylmethane, referred to as mda) is an important organic compound and is widely used in polymer materials, medicine, dyes and other fields. its chemical structure is connected by two rings through a methylene group, each with an amino functional group on each ring. this unique structure imparts excellent thermal stability and...