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Véronique Wintgens1, Samia Daoud-Mahammed, Ruxandra Gref

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Summary
This summary is machine-generated.

Hydrophobically modified dextrans and beta-cyclodextrin polymers form macromolecular assemblies through inclusion complexation. Alkyl chain length and grafting density control network properties, enabling tunable viscoelastic materials.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Hydrophobically modified dextrans (MDCn) and beta-cyclodextrin polymers (pbetaCD) are key components in developing novel macromolecular assemblies.
  • Understanding the interactions between these polymers is crucial for designing materials with specific properties.

Purpose of the Study:

  • To investigate the formation and properties of macromolecular assemblies created by mixing MDCn and pbetaCD in water.
  • To elucidate the mechanisms governing polymer-polymer interactions and their influence on network viscoelasticity.

Main Methods:

  • Synthesis of MDCn with varying alkyl chain lengths and grafting ratios.
  • Synthesis of pbetaCD polymers using beta-cyclodextrin and epichlorohydrin.
  • Characterization of polymer interactions using fluorimetry, isothermal titration microcalorimetry, phase diagrams, and viscosimetry.
  • Rheological studies to determine viscoelastic properties of the resulting temporary networks.

Main Results:

  • Successful formation of macromolecular assemblies through inclusion complexation between MDCn and pbetaCD.
  • Demonstrated control over interaction strength via alkyl chain length and junction density via grafting density and pbetaCD molecular weight.
  • Identified a cooperative effect at high alkyl grafting densities influencing network formation.
  • Characterized the viscoelastic properties of the temporary networks in the semidilute range.

Conclusions:

  • Macromolecular assembly formation is driven by inclusion complexation between hydrophobic groups on dextrans and cyclodextrin cavities.
  • The length of the alkyl chains and the density of polymer junctions are critical parameters for tuning the properties of these assemblies.
  • These findings provide a foundation for designing advanced polymeric materials with tailored viscoelastic behaviors.