Amphiphilic Polyoxyalkylene Triblock Copolymers: Self-Assembly, Phase Behaviors, and New Applications

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Title:	Amphiphilic Polyoxyalkylene Triblock Copolymers: Self-Assembly, Phase Behaviors, and New Applications
Authors:	Liu, Tian-bo;Wu, Chun-hung;Xie, Yi;Liang, De-hai;Zhoum Shui-qin;Nace, Vaughn M.;Chu, Benjamin
Contributors:	淡江大學化學學系
Date:	2000-08
Issue Date:	2009-12-01 09:01:11 (UTC+8)
Publisher:	Washington, D.C.: American Chemical Society
Abstract:	The study on the micellization behavior of amphiphilic block copolymers in aqueous media has reached the stage where semi-quantitative analysis and prediction of micellar parameters and phase behavior are possible. The deeper understanding has provided an incentive to explore new applications on these self-assembled systems. In this chapter, we summarize the self-assembly and phase behavior of polyoxyalkylene triblock copolymers containing E and P, or E and B blocks (with E, P, B being polyoxyethylene, polyoxypropylene and polyoxybutylene, respectively), in aqueous solution. Laser light scattering was used to characterize micellar parameters in the dilute solution regime and small-angle X-ray scattering was employed to study gel-like ordered packings of the micelles at high polymer concentrations. The hydrophobic blocks form micellar cores and are mainly responsible for the formation of micelles (cmc, aggregation number, and thermodynamic parameters). The hydrophilic block length determines the micellar size and intermicellar interactions. The co-association behavior of a mixture of two different block copolymers in aqueous solution has also been elucidated. The effect of block length on phase separation (clouding temperature) can be discussed on the basis of experimentally determined empirical rules. At high polymer concentrations, unique gel-like micellar packings and their spatial supramolecular rearrangements (e.g., bcc, hexagonal, lamellar) occurred. The phase diagrams could be very rich, especially with the addition of another immiscible solvent. These gel-like materials with ordered hydrophilic-hydrophobic packings gave access to new applications in analytical and biological sciences — the structure served as a medium in capillary gel electrophoresis, e.g., for double-stranded DNA analysis with single base-pair resolution.
Relation:	Associative polymers in aqueous media 765, pp.2-20
Appears in Collections:	[Graduate Institute & Department of Chemistry] Chapter

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