Chinese Journal of Liquid Crystals and Displays, Volume. 39, Issue 9, 1145(2024)
Analysis for the dielectric properties of trans-cyclohexyl（tri）biphenyl liquid crystal compounds in microwave frequency bands
Fig. 1. Synthetic routes of trans-cyclohexyl（tri）biphenyl liquid crystal compounds A1~A6
Fig. 2. Dielectric anisotropy（a）and phase tunability（b）of liquid crystal compounds as functions of frequency
Fig. 3. Maximum dielectric loss versus frequency for liquid crystal compounds
Fig. 4. Variation of quality factors of liquid crystal compounds with frequency
Table 1. Mesocrystalline properties of liquid crystal compounds
View tableView in ArticleTable 1. Mesocrystalline properties of liquid crystal compounds
Comp. Mol. Structure Phase transition temperature/℃
（∆H/（kJ·mol-1））
∆TN/℃ ∆n（589.2 nm） A1 
Cr 53.4（25.07）N 199.2（0.76）Iso 145.8 0.321 A2 
Cr 48.9（29.47）N 135.2（0.31）Iso 86.3 0.315 A3 
Cr 50.5（24.05）N 196.3（0.78）Iso 145.8 0.310 A4 
Cr 89.49（70.03）N 215.78 Iso 126.3 0.396 A5 
Cr 74.22（45.92）N 220.62 Iso 146.4 0.394 A6 
Cr 71.5（48.07）N 234.1（0.31）Iso 162.6 0.395 B1 
Cr 13.1（31.25）Iso 0 0.245 B2 
Cr 57.4（23.64）N 159.2（0.20）Iso 101.8 0.385 B3 
Cr 87.2（61.32）N 300.1（0.76）Iso 212.9 0.436
Table 2. Dielectric performance of liquid crystal compounds tested at 19 GHz
View tableView in ArticleTable 2. Dielectric performance of liquid crystal compounds tested at 19 GHz
化合物 εr∥ εr⊥ ∆εr tanδ⊥ tanδ∥ τ η ∆nmw A1 3.416 2.629 0.787 6.76E-03 3.26E-03 0.230 34.080 0.226 8 A2 3.242 2.476 0.766 6.49E-03 3.61E-03 0.236 36.396 0.227 1 A3 3.332 2.586 0.746 6.03E-03 3.91E-03 0.224 37.101 0.217 2 A4 3.685 2.812 0.873 6.14E-03 2.88E-03 0.237 38.580 0.242 7 A5 3.647 2.801 0.846 5.82E-03 2.85E-03 0.232 39.900 0.236 1 A6 3.429 2.596 0.833 5.40E-03 2.28E-03 0.243 45.010 0.240 5 B1 3.113 2.534 0.578 1.18E-02 9.50E-03 0.186 15.700 0.172 3 B2 3.352 2.549 0.803 7.74E-03 6.47E-04 0.240 30.960 0.234 3 B3 3.806 2.634 1.171 5.64E-03 3.02E-03 0.308 54.579 0.327 8
Table 3. Calculated values of dipole moment and polarisation rate of liquid crystal compounds under electrostatic field
View tableView in ArticleTable 3. Calculated values of dipole moment and polarisation rate of liquid crystal compounds under electrostatic field
化合物 axx ayy azz ∆α μ A1 354.587 155.945 121.789 217.739 5.082 A2 529.863 230.311 159.044 340.820 5.617 A3 540.070 235.454 171.480 346.169 5.603 A4 711.669 247.982 191.269 494.489 6.689 A5 728.333 259.328 198.934 501.922 6.726 A6 746.123 268.763 207.233 510.911 6.723 B1 445.952 180.623 124.353 297.483 5.427 B2 644.349 210.367 162.277 459.917 6.571 B3 827.747 244.627 213.65 599.203 6.749
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Qian YUAN, Youlan TU, Menglong LEI, Peiwen LÜ, Shengli WU, Zhiyong ZHANG, Hongmei CHEN, Xiangru WANG. Analysis for the dielectric properties of trans-cyclohexyl（tri）biphenyl liquid crystal compounds in microwave frequency bands[J]. Chinese Journal of Liquid Crystals and Displays, 2024, 39(9): 1145
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Received: May. 24, 2024
Accepted: --
Published Online: Nov. 13, 2024
The Author Email: Zhiyong ZHANG (zzy6211@126.com)
