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Associative pH sensitive system.

Noëlle Martine Gosselet1, Véronique Wintgens, Catherine Amiel

  • 1Laboratoire de Recherche sur les Polymères, U. M. C7581, CNRS, 2-8 rue Henri Dunant, 94320 Thiais, France. gosselet@glvt-cnrs.fr

Macromolecular Bioscience
|April 9, 2005
PubMed
Summary

New pH-sensitive polymer systems were developed using modified dextran and cyclodextrin copolymers. These materials exhibit tunable properties, showing phase separation or soluble complex formation based on pH and ionic strength.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Development of stimuli-responsive materials is crucial for advanced applications.
  • Associative polymers offer tunable properties based on molecular interactions.
  • Cyclodextrin-based copolymers are versatile building blocks for functional materials.

Purpose of the Study:

  • To synthesize and characterize novel pH-sensitive associative polymer systems.
  • To investigate the influence of pH on the interaction between polymer components.
  • To explore the role of electrostatic and inclusion complex interactions in system behavior.

Main Methods:

  • Synthesis of modified dextran and beta-cyclodextrin-epichlorhydrin copolymers (neutral and cationic).
  • Investigation of pH-dependent properties using phase diagrams and viscosimetry.

Related Experiment Videos

  • Study of guest-host affinity (hydrophobic groups within CD cavities) as a function of pH.

    • Main Results:

    • Neutral cyclodextrin systems showed pH-dependent affinity, leading to phase separation at low pH and soluble complexes at high pH (>5).
    • Cationic cyclodextrin systems exhibited opposite behavior due to combined electrostatic and inclusion complex interactions.
    • Salt addition modulated system response by screening electrostatic interactions.

    Conclusions:

    • The synthesized dextran-based systems demonstrate tunable pH sensitivity.
    • The interplay between inclusion complexation and electrostatic interactions dictates system behavior.
    • These materials hold potential for applications requiring controlled phase transitions and complexation.