Thermotropic polyesters, 2. Synthesis of regular polyesters from aromatic dicarboxylic acids and phenols or aliphatic diols, and study of their mesomorphic properties

Bilibin, A. Yu.; Теньковцев, А. В.; Piraner, Olga; Pashkovsky, Evgenii E.; Skorokhodov, S. S.

doi:10.1002/macp.1985.021860806

Cited by 89 publications

(26 citation statements)

References 30 publications

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“…The acid chlorides 1 and 2 were prepared in one step from corresponding acids synthesized by interphase condensation of terephthaloyl or 1,2,4-benzenetricarboxylic acid chlorides with p-4-hydroxybenzoic acid [4,5]. The acid chlorides 1 and 2 were used for synthesis of rod-like and Y-shaped compounds 3 and 4, respectively, by condensation with available semifluorinated alcohols and corresponding p-alkylcarboxyphenols (Schemes 1 and 2).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Rod-Like and Y-Shaped Liquid-Crystalline Compounds with Fluorinated Tail Groups

Zuev

2011

Molecular Crystals and Liquid Crystals

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A series of the rod-like and Y-shaped liquid-crystalline (LC) compounds with per-and semifluorinated tails was synthesized with variation of the tail length. The perfluoroalkyl tails enhanced stability of the mesophase both for rod-shaped and Y-shaped LC compounds. The effect of semifluoroalkyl tails is different. For rod-shaped compounds such substituents strongly suppress LC properties. For Y-shaped compounds, smectic properties are stabilized.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Rod-Like and Y-Shaped Liquid-Crystalline Compounds with Fluorinated Tail Groups

Zuev

2011

Molecular Crystals and Liquid Crystals

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“…4-Valeryloxybenzoyl chloride I1 was synthesized as described previously [ 131; 4-valeryloxy-3-methoxybenzoic acid (recrystallized from n-hexane, melting point 103.9"C) and its chloride I11 were synthesized according to the same method. 44'-(Sebacoy1dioxy)dibenzoyl dichloride IV was obtained as reported elsewhere [ 131, following the method of Bilibin et al [14]. The same procedure was adopted to obtain 4,4'-(sebacoyldioxy)-3,3'-dimethoxydibenzoic acid (recrystallized from 1,4-dioxane, melting point 185.1 "C) and the corresponding acid dichloride V (recrystallized from nhexane, melting point 8343°C).…”

Section: Methodsmentioning

confidence: 99%

Structure and substitution effects on the thermotropicity of some polyesters and model compounds

Costa¹,

Lisciotto²,

Valenti³

1992

Liquid Crystals

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The variations which occur in the thermal stability of the nematic mesophase as a function of the structure of the mesogenic moiety are considered here for the role played by three types of modifications. These are changes in the chemical nature of the mesogenic group, variation of the axial ratio of the rigid core and the presence of lateral substituents on the aromatic rings. Low molecular weight and polymeric liquid crystals of similar chemical nature have been investigated in order to see if parallel structure-property relationships exist between the two groups of compounds. In particular, starting from a mesogenic group built up of three aromatic rings connected by ester bonds, we have introduced the following modifications: (i) substitution of the central -COOC,H,OOC-with the -CH=N-N=CH-group;(ii) addition of two oxybenzoic end units to increase the length of the mesogenic moiety; (iii) introduction of two or more lateral methoxy substituents on the aromatic rings. The compounds were obtained by low temperature solution esterification between acyl chlorides and phenolic derivatives in the presence of a tertiary amine. Syntheses generally took place through the preliminary preparation of suitable intermediates. The thermal stability and the nature of the mesophases have been examined by different techniques. An interpretation of the results on the basis of the axial ratio and the strength of orientation dependent mutual attractions is attempted for model compounds. As far as polymers are concerned thermodynamic parameters follow the expected trend, if compared with those of low molecular weight analogues. Qualitatively models and polymers exhibit a similar dependence of mesophase stability on geometrical and electronic effects.

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“…pounds for thermotropic liquid crystalline polyesters based on the corresponding phenyl terephthalate meso-2. Ex perimental genic units [7,8 ]. However, reports concerned with 2.1.…”

Section: Introductionmentioning

confidence: 94%

Synthesis and SmC* properties of chiral liquid crystalline terephthalates

et al. 1998

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Chiral ester derivatives of terephthalic acid containing one, three, or ® ve phenyl rings were prepared by using (S)-2-methylbutanol or (R)-2-chloropropanol as starting materials. The one-ring terephthalates did not exhibit any liquid crystalline phases, but one of them was used as a chiral dopant in ferroelectric mixtures. Elongation of the aromatic core structure to three and ® ve phenyl rings stabilized the SmA phase, whereas a (monotropic) SmC* phase was detected in some three-ring and ® ve-ring derivatives. In ferroelectric mixtures based on the terephthalates, spontaneous polarizations up to 340 nC cmÕ 2 were measured.

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Thermotropic polyesters, 2. Synthesis of regular polyesters from aromatic dicarboxylic acids and phenols or aliphatic diols, and study of their mesomorphic properties

Cited by 89 publications

References 30 publications

Synthesis of Rod-Like and Y-Shaped Liquid-Crystalline Compounds with Fluorinated Tail Groups

Synthesis of Rod-Like and Y-Shaped Liquid-Crystalline Compounds with Fluorinated Tail Groups

Structure and substitution effects on the thermotropicity of some polyesters and model compounds

Synthesis and SmC* properties of chiral liquid crystalline terephthalates

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