Micellization of Ionic Block Copolymers
Micellization of Ionic Block Copolymers
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DOI：
10.1002/chin.199623311
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发表时间：
1996-02
期刊：
影响因子：
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通讯作者：
M. Moffitt;K. Khougaz;A. Eisenberg
中科院分区：
文献类型：
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作者：
M. Moffitt;K. Khougaz;A. Eisenberg
The investigation of ion-containing block copolymers in solution has revealed that these materials form spherical aggregates, known as micelles, in both water and organic solvents. 1-4 Studies of the formation and characteristics of these aggregates have generated a great deal of interest, as micelles of ionic block copolymers provide an extremely versatile addition to the growing field of molecular self-assembly. Possible applications in the areas of advanced materials and drug delivery have spurred our own interest in this field.For many years, the phenomenon of micellization has been known to occur in solutions of low molecular weight amphiphiles (or surfactants) above a concentration known as the critical micelle concentration (cmc). The cmc is a function of both the amphiphile and the solvent environment and also tends to vary with the method of detection. However, in general terms, we can state that only single amphiphiles exist in solution below the cmc while, above the cmc, associates (or aggregates) tend to form. Based on the kinetics of exchange between the unimers and their self-assembled structures, the term “associate” is generally reserved for surfactant micelles, while micelles of block copolymers are often referred to as “aggregates”. This point will be further discussed later on.
