Abstract
Two different series of waterborne polyurethanes based on anionic centers: dimethylol propionic acid (DMPA) and N,N-bis(2-hydroxy ethyl)-2-aminoethane sulfonic acid sodium salt (BES sodium salt) were prepared from hydrogenated MDI (H12MDI), poly(ε-caprolactone), and 1,4-butanediol (BDO). The BES-based dispersions showed a smaller average particle size, and higher viscosity in comparison to the DMPA-based series. Furthermore, the tensile strength, thermal stability, and modulus of the polyurethane films for the BES ionic center were higher than the DMPA-based films. 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.
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Honarkar, H., Barmar, M. & Barikani, M. Synthesis, characterization and properties of waterborne polyurethanes based on two different ionic centers. Fibers Polym 16, 718–725 (2015). https://doi.org/10.1007/s12221-015-0718-1
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DOI: https://doi.org/10.1007/s12221-015-0718-1