Polymer Stabilized Cholesteric Liquid Crystal Siloxane for Temperature-Responsive Photonic Coatings

Area of Science:

• Materials Science
• Polymer Chemistry
• Optics

Background:

• Temperature-responsive photonic coatings are crucial for smart windows but challenging to fabricate.
• Existing methods often lack efficiency or scalability for reflective polymer coatings.

Purpose of the Study:

• To develop a novel temperature-responsive, infrared-reflective coating.
• To utilize a simple bar coating method for fabrication.
• To create a coating with tunable optical properties.

Main Methods:

• Synthesis of a side-chain liquid crystal oligosiloxane with acrylate, chiral, and mesogenic moieties.
• Fabrication of the photonic coating via bar-coating the liquid crystal oligomer on glass.
• UV-curing and mediator removal to yield a transparent, IR-reflective polymer coating.

Main Results:

• Successful synthesis and characterization of the liquid crystal oligosiloxane.
• Development of a transparent, IR-reflective polymer-stabilized cholesteric liquid crystal coating.
• Demonstration of reversible, temperature-dependent blue-shift in reflection band from 1400 nm to 800 nm.

Conclusions:

• The developed coating is temperature-responsive and IR-reflective.
• The bar coating method provides a simple fabrication route.
• The coating exhibits tunable optical properties suitable for smart window applications.