Use of infrared spectroscopy for the analysis of the average properties of nonylphenol-ethylene oxide condensates

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Abstract
The use of infrared spectroscopy is proposed for the determination of some average properties of nonylphenol-ethylene oxide condensates such as average relative molecular mass, average degree of condensation, the hydrophobic-lipophilic balance (HLB) and percentage of ethylene oxide. The method, based on the existence of a regression law between the logarithm of the surfactant properties and the logarithm of the ratio of the heights of the bands at 960 and 840 cm–1, is precise (the relative standard deviations for a series of eight independent analyses are 0.9% for HLB, 1% for percentage of ethylene oxide and 1.6% for relative molecular mass) and accurate; no blank correction is required and there is no constant relative error.

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