Properties Investigation of Waterborne Polyurethane Dispersions Using Different Anionic Centers

Two different series of waterborne polyurethanes based on anionic centers: dimethylol propionic acid (DMPA) and N,Nbis( 2-hydroxy ethyl)-2-aminoethane sulfonic acid sodium salt (BES sodium salt) were prepared from hydrogenated MDI (H12MDI), poly(e-caprolactone), and 1,4-butanediol (BDO). Effects of DMPA and BES on the properties of samples were studied. The results showed that the mechanical properties of the BES-based samples were higher than the DMPA-based series. These were due to the higher activity and more powerful degree of dissociation and electrostatic interaction of –SO3 - Na+ groups in comparison to the quaternary ammonium carboxylate groups of the neutralized DMPA. A detailed view of the mechanical properties will be presented in this paper