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Tracer Diffusivity in Amphiphilic Polymer Model Co-Networks.

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Amphiphilic polymer conetworks (APCNs) control star polymer diffusion. Hydrophilic and hydrophobic star polymers show varied diffusion in APCNs, influenced by solvent and polymer concentration, impacting drug delivery applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomedical Engineering

Background:

  • Amphiphilic polymer conetworks (APCNs) offer tunable properties for applications like membranes and drug delivery.
  • Controlling molecular diffusion within APCNs is crucial for optimizing their performance.
  • Understanding star polymer transport in heterogeneous networks is key to designing advanced materials.

Purpose of the Study:

  • To investigate the diffusion behavior of hydrophilic and hydrophobic star polymers within model APCNs.
  • To explore the influence of solvent conditions (cosolvent vs. selective solvent) and polymer concentration on diffusion.
  • To elucidate the underlying mechanisms governing star polymer transport in APCNs.

Main Methods:

  • Fabrication of model APCNs using heterocomplementary end-linking of tetra-poly-(ethylene glycol) (t-PEG) and tetra-poly-(ε-caprolactone) (t-PCL).
  • Utilized Fluorescence Recovery After Photobleaching (FRAP) and Forced Rayleigh Scattering (FRS) to study star polymer diffusion.
  • Compared diffusion of various molecular weight t-PEG and t-PCL tracers in APCNs swollen in toluene and water.

Main Results:

  • FRS confirmed Fickian diffusion for all tracers in toluene-swollen APCNs.
  • Tracer diffusivity in the unentangled regime approximated Rouse scaling, with deviations at higher polymer content.
  • PEG tracers exhibited entanglement-like diffusion below the expected concentration, suggesting a strangulation regime impact.
  • Partial swelling in a selective solvent enhanced diffusion, while diffusion in water-swollen APCNs became independent of preparation conditions.

Conclusions:

  • Star polymer diffusion in APCNs is complex, influenced by polymer architecture, network structure, and solvent selectivity.
  • The findings provide fundamental insights into transport phenomena within heterogeneous polymer networks.
  • This research contributes to the rational design of polymer-based materials for drug delivery and other biomedical applications.