was then slowly cooled to room temperature 25 u00b0 c for 1 hour to obtain a composition of polymeric micelles formed in the liquid polyethylene glycol the composition obtained from the above step 1 was diluted with 4 ml of distilled water and the aqueous solution was then put into a dialysis bag the liquid polyethylene glycol was removed from the solution by dialyzing the solution against water for 12 hours an aqueous polymeric micellar solution was obtained the dialyzed aqueous micellar solution obtained from the above step 2 was then filtered through a membrane filter having a pore size of 0 22 u03bcm to sterilize it and it was then freeze dried in an aseptic environment according to a method described in u s pat no 5 510 103 a polymeric micellar solution was prepared by dissolving 1 g of the diblock copolymer prepared in example 1 molecular weight mpeg pla 2 000 1 800 daltons in enough distilled water to give a concentration of 0 05 w v the polymeric micellar composition in powder form was obtained by freeze drying the aqueous micellar solution the polymeric micelles prepared in example 6 and comparative example 1 was dispersed in suitable amount of distilled water to give a concentration of 0 1 w v and the particle size of each.