Novel Fluorine-Containing Anionic Aqueous Polyurethanes |
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| Authors: | S. Yang H. X. Xiao D. P. Higley J. Kresta K. C. Frisch W. B. Farnham |
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| Affiliation: | 1. Polymer Institute University of Detroit Mercy , 4001 W. McNichols Road, Detroit, Michigan, 48221;2. Petrochemicals E. I. du Pont de Nemours &3. Co. , P.O. Box 80336, Wilmington, Delaware, 19880-0336;4. Polymer Institute University of Detroit , Mercy 4001 W. McNichols Road, Detroit, Michigan, 48221 |
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| Abstract: | Abstract Various amounts of fluorine-containing polyol (F-diol, MW = 3700) were introduced into the soft segment of anionic aqueous polyurethanes (PUs) to examine the effect of the F-diol on the properties of the anionic aqueous PUs. The hard segments in the anionic aqueous PUs consisted of 4,4′-methylene bis(cyclohexylisocyanate), dimethylolpropionic acid, and 1,4-cyclohexanediamine (cis/trans = 80/20). Both the mechanical and water resistance properties of the anionic aqueous PUs were improved after introducing small amounts of the F-diol in the soft segment of the aqueous PUs. This is due to the increased intermolecular forces and crystallinity as well as the hydrophobic characteristic of the F-diol. Thermal analysis of the F-diol modified anionic aqueous PUs by differential scanning calorimetry and dynamic mechanical analysis indicated that both intermolecular forces and crystallinity increased with increasing concentration of the F-diol. However, both the increased intermolecular forces and crystallinity could have an adverse effect on the interface adhesion. |
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