The phase separation of the Pluronic L64/water/p-xylene system in mesoscopic region was simulated using MesoDyn and the results which are in agreement with the experiment results. Phase separation of the system did not take place in pure p-xylene or in the presence of a small amount of water, but with increasing of the concentration of water, phase separation of the system took place markedly and formed micelles with different shapes. This paper also compares th emesoscopic morphology formations of systems at different concentrations of solvents and discusses the effect of water during the phase separation. By analysing the water distributions of the systems after 1000 simulation steps, we can proved that free water do exist in the micellar core.

Key words: PHASE SEPARATION, NON IONIC SURFACTANTS, INTERACTIONS