Bis-tolane liquid crystals terminated by 2,2-difluorovinyloxyl with high birefringence and large electrical anisotropy

Yao, Chenhe; Tang, Jiaxing; Chen, Ran; Mao, Zihao; Chen, Xinbing; Chen, Pei

doi:10.1016/j.molliq.2023.121369

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Thermal stability is an important parameter for evaluating LC application, which is usually determined by thermogravimetric analysis (TGA) [50–52] . The TGA curves of target compounds are presented in Figure 6 [53] …”

Section: Resultsmentioning

confidence: 99%

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Effect of Functional Group Positional Isomerization on the Mesomorphic Properties and Thermal Stability of Biphenyl Ester Liquid Crystals

Yang,

Zhu,

Liu

et al. 2024

ChemistrySelect

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Intermolecular interactions and molecular configurations are of great significance for the formation of liquid crystals. During this study, a series of isomer compounds with biphenyl esters as rigid cores were synthesized, and their mesomorphic properties and thermal stability were investigated. Based on the same rigid core, compounds heptyl 4′‐methoxy‐[1,1′‐biphenyl]‐4‐carboxylate (1OBE7), propyl 4′‐(pentyloxy)‐[1,1′‐biphenyl]‐4‐carboxylate (5OBE3), ethyl 4′‐(hexyloxy)‐[1,1′‐biphenyl]‐4‐carboxylate (6OBE2) and methyl 4′‐(heptyloxy)‐[1,1′‐biphenyl]‐4‐carboxylate (7OBE1) have no mesophase, while compounds hexyl 4′‐ethoxy‐[1,1′‐biphenyl]‐4‐carboxylate (2OBE6), pentyl 4′‐propoxy‐[1,1′‐biphenyl]‐4‐carboxylate (3OBE5) and butyl 4′‐butoxy‐[1,1′‐biphenyl]‐4‐carboxylate (4OBE4) have multiple smectic mesophases, whereas the production of the smectic mesophase is due to the microphase separation between aromatic cores and the alkyl chains. Compound 3OBE5 exhibiting good thermal stability (The value of T5% is 258.3 °C). In addition, with the right shift of the functional group position, compound 4OBE4 formed the widest smectic mesophase. The results show that the mesophase properties and thermal stability of liquid crystals are related to the position of the functional group.

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Section: Resultsmentioning

confidence: 99%

“…[50][51][52] The TGA curves of target compounds are presented in Figure 6. [53] From Figure 6(a), it can be seen that the initial decomposition temperatures of compounds…”

Section: Mesomorphic Propertiesmentioning

confidence: 99%

Effect of Functional Group Positional Isomerization on the Mesomorphic Properties and Thermal Stability of Biphenyl Ester Liquid Crystals

Yang,

Zhu,

Liu

et al. 2024

ChemistrySelect

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“…Under the N 2 atmosphere, the Shimadzu DSC-60 instrument was unitized to measure the clearing points ( Tc ) of all LC mixtures by controlling the heating/cooling rate at 10 °C/min. The low-temperature storing temperature ( Ts ) [ 36 ] was measured by a Haier Ultralow Temperature Freezer DW-86W100. The LC diluters T1 – T4 were added into the parent LC mixture (HTD028200-200, noted as HTD ) with a mass fraction of 10%, respectively, to prepare four new LC mixtures H1 – H4 .…”

Section: Methodsmentioning

confidence: 99%

Difluorovinyl Liquid Crystal Diluters Improve the Electro-Optical Properties of High-∆n Liquid Crystal Mixture for AR Displays

et al. 2023

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A liquid crystal (LC) mixture in liquid crystal on silicon (LCoS) is the core material for augmented reality (AR) displays. However, a LC mixture with high birefringence (Δn) and large dielectric anisotropy (Δε) possesses high viscosity (γ1), which results in a slow response time of LCoS devices for AR displays. This work proposes to apply difluorovinyl-based LC diluters to fine balance the low viscosity, high ∆n, and large ∆ε of the LC mixture for a fast response time. Through studying their effects on the key electro-optical properties of a high-∆n LC mixture, it is found that doping these diluter molecules to a high-∆n LC mixture can decrease the viscoelastic coefficient (γ1/K11), increase ∆ε and the figure of merit, maintain a wide nematic phase temperature range, a high clearing point, and ∆n. It also means that these diluters could effectively regulate the relationship between ∆n, ∆ε, and γ1 in the LC mixtures to achieve a fine balance of various excellent properties and further improve the LC device’s response time. The widespread applications of these liquid crystal diluters in emerging liquid crystal optical devices are foreseeable.

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Terminal groups enhance the birefringence and dielectric anisotropy of fluorinated terphenyl liquid crystals for AR displays

Chen,

Zou,

Mao

et al. 2024

Journal of Molecular Liquids

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Bis-tolane liquid crystals terminated by 2,2-difluorovinyloxyl with high birefringence and large electrical anisotropy

Cited by 5 publications

References 30 publications

Effect of Functional Group Positional Isomerization on the Mesomorphic Properties and Thermal Stability of Biphenyl Ester Liquid Crystals

Effect of Functional Group Positional Isomerization on the Mesomorphic Properties and Thermal Stability of Biphenyl Ester Liquid Crystals

Difluorovinyl Liquid Crystal Diluters Improve the Electro-Optical Properties of High-∆n Liquid Crystal Mixture for AR Displays

Terminal groups enhance the birefringence and dielectric anisotropy of fluorinated terphenyl liquid crystals for AR displays

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