Abstract
Aqueous size-exclusion chromatography was used to determine hydrodynamic volumes of micelles formed by four series of poly(oxyethyelene) methyl- n-alkyl ethers, CH 3(OCH 2CH 2_ m O(CH 2) n H, with m having number-average values in the range 13–53 and n having values in the range 12–21. The surfactants in solution were injected at concentrations far above their critical micelle concentrations in order to avoid complexities due to the micelle-free-chain equilibrium. The hydrodynamic volumes of the micelles were found to increase with increase in n at fixed m and also with increase in m at fixed n. The effects of block lengths m and n on the aggregation numbers of the micelles was roughly estimated by combining their hydrodynamic volumes with measures of their intrinsic viscosities.
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