Study on dielectrics and low-temperature viscosity performance of high-frequency difluorovinyl liquid crystals

Ting Chen; Manman Liu; Huiqi Ouyang; Jintao Guan; Zhiyong Zhang; Xiangru Wang

doi:10.1117/12.2511325

30 January 2019 Study on dielectrics and low-temperature viscosity performance of high-frequency difluorovinyl liquid crystals

Ting Chen, Manman Liu, Huiqi Ouyang, Jintao Guan, Zhiyong Zhang, Xiangru Wang

Author Affiliations +

Proceedings Volume 10841, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Meta-Surface-Wave and Planar Optics; 108410E (2019) https://doi.org/10.1117/12.2511325
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

With the rapid development of switchable devices for the K-band (≤40GHz) frequency range, there is a strong demand for liquid crystals (LCs) exhibiting high birefringence, low melting point and low dielectric loss ,low viscosity and good miscibility. The novel series of difluorovinyl liquid crystal compounds with Δn value around 0.4, relatively low melting point which can be as low as 34.4℃ were designed and synthesized. Comparing the difluorovinyl liquid crystal compound with isothiocyanide-containing liquid crystals, UV absorption test and dielectric loss test analysis at high frequency were performed. Difluorovinyl liquid crystals were prepared into a mixed liquid crystal material for high-frequency dielectric loss test and viscosity performance test analysis at different temperatures to explore its low temperature viscosity dependenceon temperature. The experimental results show that the difluorovinyl liquid crystal compounds not only have higher Δn value and lower melting point, but also have lower dielectric loss at high frequency and low temperature viscosity, which can improve the low temperature viscosity performance of liquid crystal materials.

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Ting Chen, Manman Liu, Huiqi Ouyang, Jintao Guan, Zhiyong Zhang, and Xiangru Wang "Study on dielectrics and low-temperature viscosity performance of high-frequency difluorovinyl liquid crystals ", Proc. SPIE 10841, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Meta-Surface-Wave and Planar Optics, 108410E (30 January 2019); https://doi.org/10.1117/12.2511325

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KEYWORDS

Liquid crystals

Dielectrics

Fluorine

Microwave radiation

Birefringence

Absorption

Ultraviolet radiation

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