The ferroelectric phases derived from the 4-<i>n</i>-alkoxycinnamic acids

Leslie, Thomas M.

doi:10.1080/00150198408237853

Cited by 31 publications

(4 citation statements)

References 6 publications

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“…The materials contain oligomethylene spacers, (S)-2-methylbutoxycarbonyl or discoveries have led to extensive studies on FLC materials because of their rapid switching time and their (S)-1-methylheptoxycarbonyl chiral moieties, and three aromatic rings of ester core units. The in¯uence of the memory e ect toward an applied electric ® eld [3]. FLCs and ferroelectric liquid crystalline polymers ( FLCPs) spacer units and the di erent chiral tails on the formation of mesophases and spontaneous polarization is also are studied extensively for display applications [ 4± 8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new ferroelectric liquid crystals containing oligomethylene spacers

Chen¹,

Wu²

1998

Liquid Crystals

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Two series of ferroelectric liquid crystals containing a phenyl biphenyl carboxylate mesogenic group and oligomethylene spacers (n = 3, 4, 6, 8 ) were synthesized and characterized. The chiral moieties are the (S)-2-methylbutoxycarbonyl and (S)-1-methylheptoxycarbonyl groups. The mesomorphic behaviours of the compounds were characterized using di erential scanning calorimetry and optical polarized microscopy. Spontaneous polarization (Ps) of the liquid crystals was measured by an automated polarization tester over a wide temperature range. The mesomorphic properties are discussed as a function of spacer length and position of the chiral centre. It is found that the phase transition temperature decreases with increasing number of oligomethylene units. The phase behaviours of the LC with (S)-1-methylheptoxycarbonyl are more complex than those with (S)-2-methylbutoxycarbonyl, due to thē exible tail in the former. Moreover, the spontaneous polarization depends mainly on the position of the chiral centre, with Ps < 15 nC cmÕ 2 and Ps = 60~123 nC cmÕ 2 for the series with (S)-2-methylbutoxycarbonyl and (S)-1-methylheptoxycarbonyl groups, respectively.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new ferroelectric liquid crystals containing oligomethylene spacers

Chen¹,

Wu²

1998

Liquid Crystals

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“…Ferroelectric liquid crystals (FLCs) were discovered in 1975 by Meyer et al (1) and since then both the physics as well as the technology of FLCs have been extensively developed (2)(3)(4)(5)(6)(7)(8). Significant interest has been aroused in the chiral smectic C (SmC*) phases owing to their fast electro-optical response, which is useful in many applications.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of 2a-2c: (i) CH 3 OCOCl, Py, CH 2 Cl 2 ; (ii) C 3 H 7 COCl, Py, CH 2 Cl 2 ; (iii) C 3 F 7 COOH, THF, DEAD, P(Ph)3 .…”

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confidence: 99%

New ferroelectric liquid crystals for high‐performance optical devices

et al. 2008

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The synthesis, characterisation, helical pitch and electro-optical response of new ferroelectric liquid crystals, 49-(v-acryloxyalkoxy)-, 49-(v-alkanoyloxyalkoxy)-or 49-(v-perfluoroalkanoyloxy)alkoxybiphenyl-4-yl (S)-4-(1-octyloxy)benzoates, bearing either polymerisable or non-polymerisable terminal groups, are described. The synthesised liquid crystals exhibit both a chiral smectic C phase and a chiral nematic phase. The helical pitch and electro-optical properties of the new compounds were determined as a function of temperature.

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“…The properties of ferroelectric liquid crystal (FLC) cell (e.g., bistability, spontaneous polarization (Ps), response time ( t ), and tilt angle ( q )) have been extensively investigated. − Interest in this topic has increased since Meyer et al proved that the Sc* mesophase is ferroelectric and Clark and Lagerwall's pioneering work involving the development of surface-stabilized ferroelectric liquid-crystal (SSFLC) display technology. For FLC display devices, it is desirable that FLC material shows a chiral smectic C phase over a wide temperature range including room temperature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermal Properties of Ferroelectric Side-Chain Liquid-Crystalline Polysiloxanes Based on Naphthyl Biphenylcarboxylate Mesogenic Groups and Oligooxyethylene Spacers

1997

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In this work, three series of ferroelectric side-chain polysiloxanes containing oligooxyethylene spacers and (S)-2-methyl-1-butyl (2S)-2-[6-(4-hydroxybiphenyl-4‘-carbonyloxy)-2‘-naphthyl]propionates, (R)-1-methylheptyl (2S)-2-[6-(4-hydroxybiphenyl-4‘-carbonyloxy)-2‘-naphthyl]propionates, and (2S,3S)-2-chloro-3-methylpentyl (2S)-2-[6-(4-hydroxybiphenyl-4‘-carbonyloxy)-2‘-naphthyl]propionates mesogenic groups were synthesized. The mesomorphic behaviors of three series of ferroelectric side-chain liquid-crystalline polysiloxanes were also studied using differential scanning calorimetry, optical polarizing microscopy, and high-resolution X-ray diffraction measurements. Some of these side-chain polysiloxanes containing four phenyl rings of ester cores (i.e., −Ph−Ph−COO−naphthyl−) and chiral heptyl tail present a smectic A (SA), and a chiral smectic C (Sc*) phase (around 100 °C). Another two series containing four phenyl rings of ester cores and chiral butyl and pentyl chain tail reveal a cholesteric (N*), an SA phase and an Sc* phase. The polymer PS12NC derivative with one unit of oxyethylene spacer (n = 1) of PSn2NC series reveals a N* phase, a twist grain boundary A (TGBA) phase, and a Sc* phase. X-ray investigations reveal that the packing of mesogenic groups for PS02NA, PS02NB, PS02NC with the shortest spacers (n = 0) exhibit a bilayer (two-layer) packing structures. Moreover, polymer PS32NA, PS32NB, PS32NC with the longest spacer chain (n = 3) reveal a monolayer packing structure. However, these two types of packing structure appear simultaneously in PS12NA (n = 1), PS12NC (n = 1), PS12NB (n = 1), and PS22NB (n = 2), depending on the chiral tail length. Results obtained in this study again demonstrate that the tendency toward chiral smectic C mesomorphism increases as the rigidity of phenyl ester mesogens increases via the flexible oligooxyethylene spacers system. Furthermore, the thermal stability of the chiral smectic C mesophase is determined by the flexibility of the chiral tail.

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The ferroelectric phases derived from the 4-n-alkoxycinnamic acids

Cited by 31 publications

References 6 publications

Synthesis and characterization of new ferroelectric liquid crystals containing oligomethylene spacers

Synthesis and characterization of new ferroelectric liquid crystals containing oligomethylene spacers

New ferroelectric liquid crystals for high‐performance optical devices

Synthesis and Thermal Properties of Ferroelectric Side-Chain Liquid-Crystalline Polysiloxanes Based on Naphthyl Biphenylcarboxylate Mesogenic Groups and Oligooxyethylene Spacers

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