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Hu M.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Hu M.,Xian Modern Chemistry Research Institute | Hu M.,University of Central Florida | An Z.,State Key Laboratory of Fluorine and Nitrogen Chemicals | And 8 more authors.
Journal of Materials Chemistry C | Year: 2016

The synthesis and characterization of new 2,2-difluorovinyloxyl terminated tolane liquid crystals are reported. The mesomorphic properties, mid-wave infrared (MWIR) absorption and birefringence were investigated. The results show that these materials exhibit low absorption loss, a wide nematic phase range, a low melting point and high birefringence. The influences of fluorine substitution and terminal groups were discussed. Moreover, a room temperature eutectic mixture is formulated with relatively high birefringence (Δn = 0.254 at λ = 4 μm), modest dielectric anisotropy (Δϵ = 2.37), low viscosity (182.9 mPa s) and a low absorption coefficient in the 3-5 μm region. © 2016 The Royal Society of Chemistry.

Yang Z.-Q.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Yang Z.-Q.,Xian Modern Chemistry Research Institute | Kou L.-G.,State Key Laboratory of Fluorine and Nitrogen Chemicals | Kou L.-G.,Xian Modern Chemistry Research Institute | And 6 more authors.
Fluid Phase Equilibria | Year: 2016

This paper presents the measurements of isothermal vapor-Liquid equilibria (VLE) data for two binary systems of 2,3,3,3-tetrafluoropropene (HFO-1234yf) + 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) + 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb). The measurements were performed with an apparatus based on the static-analysis method. The HFO-1234yf + HCFO-1233xf system was measured at three temperatures from (293.15 to 313.15) K, and the HCFO-1233xf + HCFC-244bb system was measured at three temperatures from (303.15 to 323.15) K. The system of HFO-1234yf + HCFO-1233xf shows a small deviation from Raoult's law and dose not exhibit azeotropic behavior, while the system of HCFO-1233xf + HCFC-244bb exhibits near azeotropic behavior within the complete range of composition. All of the experimental data were correlated with the Peng-Robinson equations of state with the van der Waals mixing rules. Good consistency was obtained between the experimental data and correlated values for the both systems in the experimental temperature range. Thermodynamic consistency testing was also performed by the data-reduction method for the observed experimental data. © 2016 Elsevier B.V.

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