Novel FluorIne-Containing Anionic Aqueous Polyurethanes

Abstract

Various small amounts of fluorine-containing polyols (F-diol MW=3700) were introduced in the soft segment of the anionic aqueous polyurethanes (PUs) to examine the effect of the F-diol on the properties of aqueous anionic PUs. The hard segments in the anionic aqueous PUs consisted of 4,4'-methylene bis(cyclohexylisocyanate) (H₁₂MDI), dimethylolpropionic acid (DMPA) and cyclohexanediamine (CHDA, cis./trans=80/20). Both mechanical and water resistance properties of aqueous PUs were improved after introducing a small amount of F-diol in the soft segment of the aqueous PU due to the increased intermolecular forces and crystallinity as well as the hydrophobic characteristic of the F-diol. Thermal analysis of both DSC (differential scanning calorimetry) and DMA (dynamic mechanical analysis) for the F-diol modified aqueous PU indicated that both intermolecular forces and crystallinity increased with increasing the concentration of the F-diol. However both increased intermolecular forces and crystallinity could result in a negative effect on the interfacial adhesion.