Abstract:

The effect of the addition of sodium dodecyl sulfate (SDS ) upon the behavior of the F127 triblock copolymer solution has been studied in this work. The Process of F127 micelle formation in the copolymer solution with different concentration of SDS was monitored by fluorescence probe method. The gelation process of concentrated copolymer solution with different concentration of SDS was also measured. The results indicated that with increasing of SDS concentration in F127 solution, the process of micelle formation was inhibited and the structure formed became looser than that with no SDS added. For the concentrated solution of F127, if the molar ratio of SDS/F127 was less than 2 the system was gellable easily. But if the molar ratio was more than 2, the gelation process of solution was difficult to realize and it was impossible to form gel when the molar ratio was bigger than 5.

Key words: PEO-PPO-PEO triblock copolymer, Sodium dodecyl sulfate(SDS), Micelle, Gelation, Fluorescence probe