Halogenation in Achiral Calamitic Liquid Crystals. II Terminal and Linking Substitutions

Abstract

The effect on the physico-chemical properties of achiral liquid crystals of introducing halogen atoms into their terminal and linking groups is discussed and rationalized in terms of existent theories; a comparison is made with the corresponding hydrogenated and other well-known groups.

Keywords:

• Halogen
• liquid crystals
• physico-chemical properties

Notes

^a,b Extrapolated from 15 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^c,f Extrapolated from 10 wt% solution in ZLI-4792 and ZLI-2857 at 20°C, respectively.

^d Rotational viscosity γ₁ [mPas].

^e Extrapolated from 10 wt% solution in liquid crystal material at 20°C.

^a Extrapolated from 10 wt% solution in ZLI-4792 at 20°C.

^b,c Extrapolated from 20 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^d Volume viscosity η [mPas].

^e,f Extrapolated from the solution in liquid crystal material at 25°C and 20°C, respectively.

^g Extrapolated from 15 wt% solution in liquid crystal material at 25°C.

^a Extrapolated from 10 wt% solution in ZLI-4792 at 20°C.

^b,c Extrapolated from 20 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^d Volume viscosity η [mPas].

^e,f Extrapolated from 15 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^g Extrapolated from 20 wt% solution in liquid crystal material at 20°C.

^a Extrapolated from 10 wt% solution in ZLI-2857 at 20°C.

^b Extrapolated from 10 wt% solution in ZLI-4792 at 20°C.

^c,d Extrapolated from 1.5 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^e Volume viscosity η [mPas].

^f Extrapolated from 10 wt% solution in ZLI-3086 at 20°C.

^g Kinematic viscosity v [min² s⁻¹].

^a,b Extrapolated from 15 wt% solution in liquid crystal material at 25°C and 20°C, respectively.

^c Extrapolated from 10 wt% solution in ZLI-2857 at 20°C.

^d Extrapolated from 10 wt% solution in ZLI-4792 at 20°C.

^e Rotational viscosity γ₁ [mPas].