Polymer Stabilized Liquid Crystal Smart Window with Flexible Substrates Based on Low-Temperature Treatment of Polyamide Acid Technology

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 fabrica...

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Bibliographic Details
Published in:Polymers 2019-11, Vol.11 (11), p.1869
Main Authors: Zhang, Yang, Wang, Changrui, Zhao, Wei, Li, Ming, Wang, Xiao, Yang, Xiulan, Hu, Xiaowen, Yuan, Dong, Yang, Weiping, Zhang, Yi, Lv, Pengrong, He, Jialin, Zhou, Guofu
Format: Article
Language:English
Subjects:
Alignment
Dielectric properties
Fourier transforms
High temperature
Liquid crystals
Low temperature
Microscopy
Optics
Polyamide resins
Polyethylene terephthalate
Polymers
Smart materials
Solvents
Substrates
Windows (apertures)
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Summary: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.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym11111869