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Thermo-cross-linked elastomeric opal films.

Christian G Schäfer1, Benjamin Viel, Goetz P Hellmann

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This study introduces a thermal cross-linking method for elastomeric opal films, creating reversible, stretch-tunable optical materials. These mechanochromic sensors exhibit excellent mechanical and optical properties after cross-linking.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Elastomeric opal films require cross-linking for reversible mechanical and optical properties.
  • Previous methods like photo-cross-linking have limitations.
  • Achieving tunable optical materials with robust performance is a key challenge.

Purpose of the Study:

  • To develop an efficient thermal cross-linking protocol for elastomeric opal films.
  • To investigate the mechanism and efficiency of thermo-cross-linking using hydroxyl- and isocyanate-functionalities.
  • To create fully reversible and stretch-tunable optical materials with mechanochromic sensing capabilities.

Main Methods:

  • Functional monodisperse core-shell particles arranged in a face-centered cubic lattice via melt flow.
  • Thermal cross-linking utilizing hydroxyl- and isocyanate-chemistries to form urethane bridges.
  • Characterization of mechanical and optical properties of the cross-linked films.

Main Results:

  • Successful implementation of a thermal cross-linking protocol for elastomeric opal films.
  • Cross-linked films exhibit rubber-like elasticity and reversible stretching.
  • Bragg reflection color changes upon deformation, enabling mechanochromic sensing.
  • The developed films possess excellent mechanical and optical properties.

Conclusions:

  • The thermal cross-linking method provides an efficient route to reversible, stretch-tunable optical materials.
  • These materials function as effective mechanochromic sensors due to controlled lattice deformation.
  • The urethane-bridge formation offers a robust and convenient cross-linking strategy for elastomeric opal films.