Abstract
Effect of hydrophilic chain length of a series of homogeneous dodecyl poly (oxyethylene) ethers [nED, n means the number of poly (oxyethylene) chain length] and the blending of two sorts of the corresponding nonions upon emulsion stability was studied by applying “multiple-drop” method. The half-life time of dodecane drops stabilized by nED increased steeply above the apparent cmc of nED and increased with increasing poly (oxyethylene) chain length. The droplets were most stable in the case of 8ED+5ED mixture with a mixed ratio corresponding to the optimum average poly (oxyethylene) chain length (about 7.5) for two kinds of nonions with different poly (oxyethylene) chain length. The results are supported by those of the rate constant of coalescence.
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