A diblock copolymer of propylene oxide and ethylene oxide, denoted Py4E316, was prepared by sequential anionic polymerization of the two monomers. C-13 NMR spectroscopy was used to obtain the absolute number-average molar mass and overall composition (whence the molecular formula), and gel permeation chromatography was used to confirm a narrow chain-length distribution. A number of techniques (light scattering, dye solubilization with DPH (1,6-diphenyl-1,3,5-hexatriene), surface tension) were used to confirm micellization in dilute aqueous solution and to determine the temperature dependence of the critical micelle concentration. Light scattering was also used to determine the temperature dependence of micellar association number and radius. Copolymer solutions of concentration 10 and 20 g dm(-3) copolymer were used to solubilize a nematic liquid crystal mixture with a wide nematic range, coded BL002. The extent of solubilization in the temperature range 20-40 degreesC could be correlated with the extent of micellization of the copolymer, leading to an upper limit at 40 degreesC of ca. 50 mg (g of copolymer)(-1), i.e., 180 mg (g of hydrophobe)(-1). It was noted that BL002 solubilization could be adapted to provide a method for determining the critical micelle temperatures of aqueous solutions of the copolymer.