DETERMINATION OF THE AVERAGE POLYADDITION DEGREE OF ALCOHOL ETHOXYLATES

The average polyaddition degree of dodecanol ethoxylates were determin ed by the proton nuclear magnetic resonance technique in the range fro m 0.4 to 39.3. The results were linearly related to the diffraction co efficients and the cloud points of the respective samples showning the correlation higher than 99%. The H-1-NMR technique is shown to be a v ery convenient and applicable tool for determination of the average et hoxylation degrees in the range much broader than that reported earlie r in the literature. The use of the cloud point and the diffraction co efficient for the estimation of the average polyaddition degree of alc ohol ethoxylation is limited to the products of the average ethoxylati on degree below 15 and 10, respectively.