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Multicolor photonic patterns through an intensity-controlled single photopolymerization step.

Yari Foelen1,2, Nieké J M van Gils1, Mart D T Claessen1

  • 1Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands. a.p.h.j.schenning@tue.nl.

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Summary
This summary is machine-generated.

UV intensity controls structural color and glass transition temperature in cholesteric liquid crystal (CLC) polymer photonic coatings. This single-step method enables tunable, multi-color, and responsive photonic materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • Cholesteric liquid crystal (CLC) polymers offer tunable structural color.
  • Controlling photonic properties and thermal characteristics simultaneously is challenging.

Purpose of the Study:

  • To investigate UV intensity as a single-step method for controlling structural color and glass transition temperature (Tg) in CLC polymer photonic coatings.
  • To explore the potential for creating multi-color and temperature-responsive photonic materials.

Main Methods:

  • Utilized varying UV intensities during photopolymerization of CLC polymer coatings.
  • Analyzed the impact of UV intensity on structural color and glass transition temperature (Tg).
  • Investigated the role of oxygen inhibition and polymer fragment formation.

Main Results:

  • UV intensity precisely controlled the structural color of CLC polymer photonic coatings in one step.
  • Higher UV intensity led to a higher glass transition temperature (Tg).
  • Low UV intensity resulted in in situ polymer fragment formation, causing color shifts and lowering Tg.

Conclusions:

  • UV intensity is a versatile parameter for tuning both optical and thermal properties of CLC polymer photonic coatings.
  • The method allows for the fabrication of single-step, multi-color, and temperature-responsive photonic materials.
  • This approach opens new avenues for advanced functional photonic polymers.