Abstract
The effect of the distribution of oxyethylene chain length of nonionic surfactants on the cloud point has been studied, using homogeneous C12H25O (CH2CH2O) nH (n=08). The broader the distribution of oxyethylene chain length, the lower the cloud point becomes. A small deviation from Poisson distribution does not cause major difference in cloud point. The cloud point vs. oxyethylene chain length calibration curves for commercial p, t-C8H17C6H4O (CH2CH2O) n-H, i-C9H10C6H4O (CH2CH2O) n-H and molecularly distilled C12H25 (CH2CH2O) n-H were obtained. The distribution of oxyethylene chain length of these samples is close to the Poisson distribution. Byproduced polyethylene glycol does not affect appreciably to the cloud point. This cloud point measurement is relatively rapid and accurate for determining the average oxyethylene chain length of nonionic surfactant. While, determination of the oxyethylene chain length by other methods requires elimination of polyethylene glycol, water, etc, and also forces not only to consume the time but alters the distribution of oxyethylene chain length in the process of the elimination, these are the disadvantages of other methods.
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