Abstract
Aqueous polyurethane dispersions (PUDs) were prepared by the prepolymer mixing technique solventfree using aromatic isocyanat[toluene diisocyanate (TDI)], poly(oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA). The properties of both the dispersion’s and casting polymer films were characterized byparticle size analyzer, viscosity and tensile tester. IR spectroscopy was used to check the end of polymerization reaction and characterization of polymer. The effect of NCO/OH molar ratio on the physico-mechanical properties of the polyurethanes was studied. Results showed that tensile strength, contact angle and average particle size increase with increase of NCO/OH molar ratios. Elongation at break and viscosity decrease with increase of NCO/OH molar ratios.