POLY 245 |
| Amphiphilic compounds such as soaps, lipids, and non-ionic surfactants produce several basic structures when dispersed in water. Block copolymer amphiphiles superficially are closely related to this class of soft materials, generating spherical and cylindrical micelles, and vesicles, depending on the overall molecular composition. Increasing molecular weight leads to several significant departures from low molecular weight systems, such as extinguishing micelle exchange due to the low critical micelle concentration and increasing morphological complexity. This lecture focuses on categorizing vesicle and micelle formation as a function of molecular weight and composition in AB, ABC, and ABCA type block copolymers in the dilute limit, and traces lyotropic diblock phases. Segregation of hydrophobic B and C blocks within dispersions leads to internal structure superimposed on the overall micelle or vesicle geometries. Incorporation of water compatible A and B blocks exerts influence over the hydrophilic corona also affecting the type and dimensions of the dispersions. |
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Multicompartment Micelles: Higher Order Self-assembly of Block Copolymers
8:30 AM-12:00 PM, Monday, 11 September 2006 San Francisco Marriott -- Salon B2, Oral
Division of Polymer Chemistry |