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Effects of surfactant and urea on dynamics and viscoelastic properties of hydrophobically assembled supramolecular hydrogel

Macromolecules, 2018, Vol.51(13), pp.4813-4820 [Peer Reviewed Journal]

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  • Title:
    Effects of surfactant and urea on dynamics and viscoelastic properties of hydrophobically assembled supramolecular hydrogel
  • Author: Mihajlovic, Marko ; Wyss, Hans M. ; Sijbesma, Rint P.
  • Contributor: Orthopaedic Biomechanics ; Supramolecular Polymer Chemistry ; Wyss ; Microsystems ; Institute for Complex Molecular Systems ; Macromolecular and Organic Chemistry
  • Found In: Macromolecules, 2018, Vol.51(13), pp.4813-4820 [Peer Reviewed Journal]
  • Subjects: Organic Chemistry ; Polymers And Plastics ; Inorganic Chemistry ; Materials Chemistry ; Journal Article
  • Language: English
  • Description: Physically associated hydrogels based on strong hydrophobic interactions often have attractive mechanical properties that combine processability with elasticity. However, there is a need to study such interactions and understand their relation to the macroscopic hydrogel properties. Therefore, we use the surfactant sodium dodecyl sulfate (SDS) and urea as reagents that disrupt hydrophobic interactions. The model hydrogel is based on a segmented copolymer between poly(ethylene glycol) (PEG) and hydrophobic dimer fatty acid (DFA). We show that both agents influence viscoelastic properties, dynamics, and relaxation processes of the model hydrogel. In particular, the relaxation time is significantly reduced by urea, as compared to SDS, whereas the surfactant causes a decrease of the modulus of the hydrogel more efficiently. The reversibility of the effects of SDS and urea can be exploited, for instance, by using an injectable sol that solidifies when the SDS or urea diffuses out of the sample....
  • Identifier: ISSN: ; ISSN: 0024-9297

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