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SYNOPSISWe have successfully prepared Congo Red-based polyurethane ionomers at our lab, and these ionomer structures have been proven by infrared (IR) spectra. For a dye-based polyurethane ionomer molecule solution, the surface tension was found to decrease, but the number-average particle size was found to increase with increasing concentration of Congo Red employed to prepare this ionomer molecule. Interestingly, the number-average particle size of dye-based polyurethane ionomer molecules decreases with increasing concentration of Congo Red in the presence of other dyes (i.e., Remajol Brilliant Blue R and Amaranth), as a result of Congo Red intramolecular interaction. It is important to point out that the addition of a fixed concentration of Amaranth to prepare Congo Red-based polyurethane ionomer molecules will significantly enhance the tensile strength but will decrease the elongation of this ionomer molecule. 0 1995 John Wiley & Sons, Inc.

The reaction of toluene diisocyanate (TDI) with dimethylol propionic acid (DMPA) or diaminopentane sulphonic acid sodium salt and other additives to form the structure of anionic polyurethane (PU) ionomer molecule has been proven by FT-IR spectroscopy.In aqueous solution, the surface tension of anionic PU ionomer molecule is seen to slightly increase with increasing concentration of ES-200. This is because the adsorption of hydrophobic groups of ionomer molecules at the surface of aqueous solution becomes even more ordered. Under the same experimental conditions, the surface tension of anionic PU ionomer molecule appears to slightly decrease with increasing concentration of DMPA, as a result of increased hydrophobic groups of ionomer molecule adsorbed at the surface of aqueous solution. The number average particle size of anionic PU ionomer molecule in aqueous solution appears to steadily increase with an increase in the concentration of DMPA or ES-200. This is because the intermolecular interaction between ionomer±ionomer molecules themselves and between ionomer±water molecules may increase the free volume of anionic PU ionomer molecule, thus causing their number average particle size to increase.Experimental results indicate that both the tensile strength and the modulus of self-cured film of anionic PU ionomer molecule appear to decrease with increasing concentration of DMPA or ES-200, as a result of intramolecular interaction. However, the elongation of self-cured film of anionic PU ionomer molecule is seen to increase with increasing concentration of DMPA or ES-200. This may be the result of weakening crosslinking due to strong intramolecular interaction of ionomer molecule. For the peel strength of self-cured film of anionic PU ionomer coated on the fabric (30% polyester/ 70% cotton), it has been found that the peel strength increases with increasing concentration of DMPA or ES-200, as a result of increased hydrophilic interaction between ionomer molecules themselves.