物理化学学报 >> 1995, Vol. 11 >> Issue (11): 985-990.doi: 10.3866/PKU.WHXB19951106

研究论文 上一篇    下一篇

荧光探针法研究PEO-PPO嵌段共聚物胶束的特性

顾新华,戴光松,吴世康   

  1. 中国科学院感光化学研究所，北京 100101
  • 收稿日期:1994-12-29 修回日期:1995-05-05 发布日期:1995-11-15
  • 通讯作者: 吴世康

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

Gu Xin-Hua,Dai Guang-Song,Wu Shi-Kang   

  1. Institute of Photographic Chemistry,Academia Sinica,Beijing 100101
  • Received:1994-12-29 Revised:1995-05-05 Published:1995-11-15
  • Contact: Wu Shi-Kang

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摘要：

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Pluronic F－68在水溶液中的胶束化行为．研究表明：Pluronic F－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Pluronic F－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．

关键词: 荧光探针, 水溶性嵌段共聚物, 胶束

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