Polymer stabilized liquid crystal (PSLC) devices can be used as smart privacy windows that switch between transparent and opaque states. The polyimide alignment layer of a PSLC device is usually obtained by the treatment of polyamide acid (PAA) with temperatures over 200 °C. This hinders the fabrication of PSLC devices on flexible substrates, which melt at these high temperatures. In this work, the fabrication of a PSLC alignment layer using a lower temperature that is compatible with most flexible substrates, is demonstrated. It was found that the treatment of PAA at 150 °C could generate the same alignment for liquid crystals. Based on this, a PSLC device was successfully fabricated on a flexible polyethylene terephthalate (PET) substrate, demonstrating excellent electro-optic performances.
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Zhang, Y., Wang, C., Zhao, W., Li, M., Wang, X., Yang, X., … Zhou, G. (2019). Polymer stabilized liquid crystal smart window with flexible substrates based on low-temperature treatment of polyamide acid technology. Polymers, 11(11). https://doi.org/10.3390/polym11111869