3 years ago

Acetylene-containing highly birefringent rod-type reactive liquid crystals based on 2-methylhydroquinone

Acetylene-containing highly birefringent rod-type reactive liquid crystals based on 2-methylhydroquinone
Jae-Won Ka, Mi Hye Yi, Ji Ho Yun, Inhye Jeon, Jinsoo Kim, Jinhan Cho, Eunkyoung Kim, Yun Ho Kim, Hyein Jung

New highly birefringent reactive liquid crystal materials based on the 2-methylhydroquinone core were designed and synthesised. Rod-type liquid crystal compounds bearing photo-crosslinkable reactive group of acryloyl, methacryloyl, cinnamoyl, furylacryloyl group were synthesised by introducing acetylene groups via Sonogashira coupling to obtain high birefringence, and lateral groups such as fluoro and methyl to adjust the temperature of the liquid crystal phase. The synthesised compounds were characterised using nuclear magnetic resonance spectroscopy, mass spectrometry and elemental analysis. In addition, their thermal behaviour was investigated using differential scanning calorimetry and polarised optical microscopy. After aligning the synthesised compounds, liquid crystal films were prepared by photo-irradiation. Photo-elastic modulator results showed that the obtained liquid crystal films had high birefringence (Δn) values of 0.32–0.40.

Publisher URL: http://www.tandfonline.com/doi/full/10.1080/02678292.2017.1323127

DOI: 10.1080/02678292.2017.1323127

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