The application and performance optimization study of 4,4′-diaminodimethane in polyurethane elastomers Introduction 4,4′-diaminodimethane (MDA) is an important organic compound and is widely used in the synthesis of polyurethane elastomers. Polyurethane elastomers have been widely used in many fields such as automobiles, construction, footwear, and medical care due to their excellent mechanical properties, chemical corrosion resistance...