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Adhesion of polymer vesicles.

John J Lin1, Frank S Bates, Daniel A Hammer

  • 1Department of Chemical and Biomolecular Engineering and the Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Physical Review Letters
|August 11, 2005
PubMed
Summary
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We measured the adhesion and bending modulus of block copolymer vesicles using micropipette aspiration. A model accurately described adhesion energy and bending modulus scaling with polymer composition.

Area of Science:

  • Polymer Science
  • Materials Science
  • Biophysics

Background:

  • Block copolymer vesicles are promising for various applications.
  • Understanding their mechanical properties, like adhesion and bending modulus, is crucial.
  • Bidisperse polymer mixtures present unique challenges in modeling surface properties.

Purpose of the Study:

  • To measure the adhesion energy and bending modulus of polybutadiene-poly(ethylene oxide) block copolymer vesicles.
  • To develop and validate a model for adhesion and mechanical properties of vesicles from bidisperse polymer mixtures.
  • To investigate the influence of polymer composition on vesicle properties.

Main Methods:

  • Micropipette aspiration was used to measure vesicle properties.
  • A theoretical model based on the blob model for bidisperse polymer mixtures was employed.

Related Experiment Videos

  • Adhesion energy was modeled by considering adhesive ligand extension above the polymer brush.

    • Main Results:

    • The adhesion energy between biotinylated vesicles and avidin beads was successfully modeled.
    • The model accurately reproduced the scaling of the bending modulus with polymer composition.
    • The assumption of a compact polymer brush at the vesicle surface was consistent with the data.

    Conclusions:

    • The study provides a quantitative model for the adhesion and bending modulus of block copolymer vesicles from bidisperse mixtures.
    • The findings enhance the understanding of mechanical properties in complex polymer systems.
    • The developed model can guide the design of functional polymer vesicles.