title: Self-assembly behavior of amphiphilic C₆₀-end-capped poly(vinyl ether)s in water and dissociation of the aggregates by the complexing of the C₆₀ moieties with externally added γ-cyclodextrins.
abstract: C60-end-capped polymers consisting of an amphiphilic poly(2-methoxyethyl vinyl ether) (PMOVE) main chain were synthesized by living cationic polymerization using a C60-functionalized initiator (C60VE-TFA) in the presence of EtAlCl2 as an activator and dioxane as an added base. The obtained polymers (C60-PMOVE) dissolved in a wide range of solvents including water and exhibited solvatochromism depending on the polarity of the media employed. This phenomenon was attributed to self-assembly in polar media due to hydrophobicity of the C60 moieties at the terminus of the amphiphilic polymer chain. Furthermore, the addition of γ-cyclodextrin (γ-CD), a strong host molecule for fullerenes, to the self-assembled system brought about the dissociation of the aggregates into molecularly dispersed free polymer chains. Titration of the aqueous solution of the self-assembly of C60-PMOVE with γ-CD indicated the possible formation of inclusion complexes of C60-PMOVE and γ-CD, and this binding process occurs in a positive cooperative manner.
authors: Department of Chemistry and Materials Technology, Graduate School of Science and Technology, Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
authors: Jin
authors: J
authors: Motoyanagi
authors: Akihiro
authors: A
authors: Kurata
authors: Masahiko
authors: M
authors: Minoda
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D013501:Surface-Active Agents / Q000138:chemical synthesis / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D047408:gamma-Cyclodextrins / Q000737:chemistry*
chemical_list: D037741:Fullerenes; D013501:Surface-Active Agents; D014753:Vinyl Compounds; D047408:gamma-Cyclodextrins; C000602729:poly(2-methoxyethyl vinyl ether); D014867:Water; C069837:fullerene C60