Novel Unimolecular Micelles of Hydrophobically Modified Polyelectrolytes: Synthesis, Characterization, and Functions
Random copolymers of sodium 2-acrylamido-2-methylpropanesulfonate (AMPS) and methacrylamides N-substituted with bulky hydrophobic groups with cyclic structures such as cyclododecyl (Cd), adamantyl (Ad), and 1-naphthyl (1-Np) groups undergo intrapolymer self-organization in aqueous solution and form unimolecular micelles (unimers) independent of the polymer concentrations. These unimers are highly compact as indicated by light scattering and NMR relaxation times. Hydrophobic chromophores can be tightly encapsulated in the hydrophobic cluster in the unimer by covalently incorporating into the hydrophobically modified polysulfonates. The chromophores compartmentalized in the unimers are completely isolated from one another in highly constraining nonpolar microenvironments and are protected from the aqueous phase, leading to a large modification of the photophysical and photochemical behavior.
KeywordsDynamic Light Scattering Static Light Scattering Hydrophobic Cluster Hydrophobic Association Photochemical Behavior
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