Abstract:

In this work, Cetyl Rhodamine B(CERB) was used as a main fluorescent probe in studying the micellization of Pluronic F-68 ((EO)78(PO)30(EO)78) in water. Results indicated that the critical micelle concentration of Pluronic F-68 was strongly dependent on the temperature, with the rise of temperature the CMC decresced. The miroviscosity of micelles formed was also affected by the temperature and increased with the temperature in range 25 ~ 42℃. This phenomenon was attributed to the contraction of PEO chain with the rise of temperature. Whereas the miroviscosity of the core of micelle which was formed by PPO chain decreased when temperature rised in range from 25℃ to 50℃.

Key words: Fluorescent probe, Watersoluble block copolymer, Micelle