surface modification with waterborne fuorinated non-ionic polyurethane dispersion

Abstract

Waterborne fluorinated non-ionic polyurethane dispersions (FNPUDs) were synthesized from tris(6-isocyanatohexyl) isocyanurate (TIHI), N-ethyl-N-2-hydroxylethyl-perfluorooctanesulfonamide (HFA), poly(oxyethylene glycol) (PEG) and 1,4-butanediol (BD). Waterborne polyurethane dispersion (PUD) was synthesized from isophorone diisocyanate (IPDI), poly(oxytetramethylene glycol) (PTMG), dimethylolpropionic acid (DMPA) and ethylenediamine (EDA). Fluorine PUD mixtures (FPMs) were prepared by blending the FNPUDs into the PUD. The particle size of the FNPUDs was measured by using dynamic light scattering (DLS), and the surface energy estimation and thermal property of the FPMs were studied by using a contact angle analyzer and differential scanning calorimetry (DSC). The particle size and glass transition temperature (Tg) of the FNPUDs tended to increase as the fluorine content in the FNPUD increased. When the fluorine content was 0.087 wt%, based on the total solid content, the surface energies of the FPMs exhibited the lowest values. In the same fluorine content in the FPMs, the surface energies of FPMs containing a higher fluorine content in the FNPUD exhibited a lower surface energy than those containing a lower fluorine content in the FNPUD. The thermal properties of the FPMs were found to be similar to the pure PUD. Accordingly, these results indicate that the phase separation and thermal behavior of the FNPUDs did not appear due to the compatibility of the polyether type PUD and the FNPUDs.