Branched supramolecular polymers formed by bifunctional cyclodextrin derivatives |
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Authors: | Atsuhisa Miyawaki |
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Institution: | Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan |
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Abstract: | Branched supramolecular polymers have been prepared from the mixture of 3-cinnamamide-α-CD (1) and 3-Nα-cinnamamidehexancarbonyl-N?-cinnamamide-lysinamide-α-CD (3) and from the mixture of 3-cinnamamidehexanamide-α-CD (2) and 3. Compounds 1 and 2 formed a linear supramolecular polymer, whereas compound 3 having two guest moieties formed a hyperbranched supramolecular polymer. Physical properties of these supramolecular polymers were studied by viscosity measurements in aqueous solutions. When compound 3 was added to the solution of compound 2, the ηsp/C value of the mixture of 2 and 3 was found to be much higher than that of compound 2. These results indicate that compound 3 functions as a branching moiety to increase the viscosity. Supramolecular polymers consisting of compound 2 or 3 did not show the viscosity increase, whereas the mixture of 2 and 3 gave highly viscous solutions and formed fibers from the concentrated aqueous solutions. It is caused by the branching of linear supramolecular polymers with compound 3 and hydrophobic and/or hydrogen bonding interactions between supramolecular polymers. |
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