Abstract: The nature and mechanism of solubilization of the block copolymer of polyoxye-thylene-polyoxypropylene glycols-Pluronic were investigated and the results showed that only the samples with appropriate HLB value were valid for solubilization. In aqueous solution of L64 the aromatic hydrocarbon could be solubilized, while the alkanes almost could not. The lowest concentration of L64 for solubilization decreased with the increase of the temperature.
Water could also be solubilizated in the xylene solution of L64. The size of the inverse micelles of solubilized water was much bigger than that of the micelles of solubilized xylene.
Ultraviolet and NMR spectroscopic studies showed that the xylene and toluene were included into the polyoxypropylene chains at the interior of the micelles for the PPO-PEO block copolymer.