荧光探针法研究PEO-PPO嵌段共聚物胶束的特性

A Study on the Properties of Micelle Formed by Ethyleneoxide-Propyleneoxide Copolymer with Fluorescent Probe Method

利用十六烷基罗丹明B作为主要荧光探针，研究了水溶性嵌段共聚物PluronicF－68在水溶液中的胶束化行为．研究表明：PluronicF－68形成胶束的临界胶束浓度与温度有极大关系，随温度的升高，其CMC值急剧下降，并且温度对胶束的性质也有很大影响，温度升高可导致胶束的微观粘度增大，表现出很强的负粘－温效应，并发现引起这种负粘－温效应的主要原因是PluronicF－68分子中聚环氧乙烷（PEO）链随温度升高亲水性变差引起其收缩所致，而由聚环氧丙烷（PPO）形成的内核的微观粘度随温度的升高略有下降．

In this work,Cetyl Rhoddrine 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 microviscosity of the core of micelle which was formed by PPO chain decreased when temperature rised in range from 25℃ to 50℃.