introduction n,n-dimethylcyclohexylamine (dmcha), with the chemical formula c8h17n, is a tertiary amine widely used as a catalyst in the production of polyurethane (pu) foams. it is a colorless to slightly yellow liquid with a characteristic amine odor. dmcha’s efficacy stems from its ability to accelerate both the polyol-isocyanate (gelling) and water-isocyanate (blowing) reactions, thereby influencing...