Liquid Crystals for IR: Part III - Bi- and multicomponent mixtures based on perfluoroalkyl or perfluoroalkoxy terminated oligophenyls and tolanes

ABSTRACT

Nine bicomponent systems have been prepared in order to check the ability of maintaining liquid crystalline properties of newly synthesised non-mesomorphic compounds shown previously (part I and part II) with compound having broad temperature range of nematic phase. Based on this study, several multicomponent mixtures has been developed. Their mesomorphic and spectral properties as well as birefringence, dielectric anisotropy and viscosity have been investigated. All of prepared mixtures are characterised by a wide transparency in MWIR region. Two multicomponent mixtures with different sign of dielectric anisotropy exhibit a very broad temperature range of nematic phase with the melting point below −10°C, birefringence value above 0.2, dielelectric anisotropy values above 2.0 and viscosity values below 77 mPa*s.

GRAPHICAL ABSTRACT

KEYWORDS:

• Tolane
• phenyltolane
• bistolane
• nematic
• fluorinated liquid crystal
• superfluorinated material
• infrared transparent material

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was financially supported by the National Science Centre Poland, grant number [UMO-2012/05/D/ST5/03387].