Characterisation and effect of polymer network deformation in reverse-mode polymer-stabilised cholesteric texture

A stable and scalable polymer-stabilized liquid crystal window which electrically switches from transparent to opaque has been fabricated. Scanning electron microscope measurement shows that higher polymer concentration will induce denser polymer network in polymer stabilized liquid crystal system and then stronger anchoring force between polymer network and liquid crystal molecules, which resulting in larger operating voltage. The cell with larger cell gap has a lower saturated transmittance in the voltage-on state, which attributed to a larger number of scattering domains in thick cell. The optimized cell exhibits a highly transparent voltageoff state (3.5% haze) and a voltage-on scattering state (98% haze) with the threshold voltage of around 20 V. The durability test shows that the optical device switches at least 100,000 times without degradation of optical contrast and shows a high temperature tolerance. Meanwhile, a 40 × 50 cm 2 window has been developed in an industrial production line showing the same optical properties. Our results demonstrate the fabrication of smart windows with a highly transparent rest state and high optical contrast on a commercial mass production scale, making them attractive for applications in buildings, automobiles, and switchable sunglasses for light management and potentially energy saving.

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Stable and scalable smart window based on polymer stabilized liquid crystals

Zhang

Yang

et al. 2020

J of Applied Polymer Sci

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Cationic photopolymerization of liquid crystalline epoxide in mesogenic solvents and its application in polymer-stabilized liquid crystals

Shen

Cao

Zhang

et al. 2019

Polymer

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Regulation and control of polymer network deformation in reverse-mode polymer-stabilised cholesteric texture

et al. 2016

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Characterisation and effect of polymer network deformation in reverse-mode polymer-stabilised cholesteric texture

Cited by 11 publications

References 23 publications

Stable and scalable smart window based on polymer stabilized liquid crystals

Stable and scalable smart window based on polymer stabilized liquid crystals

Cationic photopolymerization of liquid crystalline epoxide in mesogenic solvents and its application in polymer-stabilized liquid crystals

Regulation and control of polymer network deformation in reverse-mode polymer-stabilised cholesteric texture

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