| 초록 |
Waterborne polyurethane dispersions treated with organo-clays were prepared using polycarbonate-diols, 4,4′-methylenebis(cyclohexyl isocyanate), dimethylol propionic acid, dibutyltin dilaurate, and two types of organo-clays. The organo-clays were introduced into the reactants before making the prepolymers for polyurethane dispersions (PUDs). One of the organoclay has two hydroxy groups in its ammonium salt and the other has not. After ordinary neutralization, chain extending, water dispersion, and solvent removing, the waterborne polyurethane dispersions treated with organo-clays were obtained. The structures of the prepared PUDs were confirmed using FT-IR and wet chemistry analysis. The degree of organo-clay dispersion in the PUDs and PUD films was investigated by XRD. The thermal properties of the PUD films were characterized using DSC and TG-DTA. In addition, the mechanical properties were measured. |
