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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Emulsion templates enable unique microstructures for fluid-filled composites.
  • Current materials lack biocompatibility, mechanical robustness, and systematic processing for mimicking biological tissues.
  • Polydimethylsiloxane (PDMS) offers potential for advanced elastomeric foams.

Purpose of the Study:

  • To synthesize high internal phase, closed-cell PDMS elastomeric foams with enhanced properties.
  • To achieve biocompatibility, mechanical robustness, flexibility, and selective permeability in PDMS foams.
  • To establish systematic processing parameters for creating these advanced composites.

Main Methods:

  • Utilized water-in-oil high internal phase emulsions (HIPEs) stabilized by silica nanoparticles (SNPs) as templates.
  • Overcame high viscosity challenges by employing centrifugation of low internal phase emulsions (LIPEs).
  • Systematically characterized microstructural dependence on viscosity ratio, mixing speed, emulsifier concentration, and centrifugal force.

Main Results:

  • Synthesized PDMS elastomeric foams with >74% aqueous phase (up to 82%).
  • Achieved fluid-filled, closed-cell structures with excellent mechanical robustness and flexibility.
  • Demonstrated control over microstructure via systematic characterization of processing parameters.

Conclusions:

  • Developed a novel method for creating biocompatible, mechanically robust, and flexible PDMS elastomeric foams.
  • The synthesized foams show promise for applications requiring tissue-like mechanical and functional properties.
  • This work provides a systematic approach to processing advanced microstructured, fluid-filled elastomer composites.