Synthesis and Properties of Thermotropic Liquid Crystal Polymers with Main Chain Mesogenic Units

Lenz, Robert W.

doi:10.1295/polymj.17.105

Cited by 90 publications

(33 citation statements)

References 36 publications

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“…The first use of oligoethylene glycols for LCP design was mentioned in 1980 14,15) . In later years their influence on polymer properties was discussed in more detail 16) . These spacers are very convenient to control phase transition temperatures of LCP.…”

Section: Resultsmentioning

confidence: 99%

Correlation of the thermal properties of main-chain liquid crystalline polymers with the symmetry and anisometry of their mesogens

Bilibin¹,

Solovjeva

Girbasova

et al. 2000

Macromol. Chem. Phys.

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Several series of liquid crystalline poly[aroyl‐bis(oxyarylates)] with oligomethylene (n = 6 and 10) and oligooxyethylene (n = 2; 3; 4 and 6) spacers were synthesized. The structure of their mesogenic groups was varied by replacement of central or terminal units by those with reduced symmetry. The polymers were investigated by methods, such as differential scanning calorimetry, polarizing optical microscopy and in some selected cases by X‐ray diffraction methods using synchrotron radiation. An absence of transesterification during measurements at elevated temperatures was proved by 13C NMR spectroscopy. The formation of smectic melts was demonstrated for all the polymers with high symmetry of the mesogenic group. A lower symmetry leads to a decrease of crystallinity of the polymers and to the appearance of a nematic phase in their melts. Comparative analyses of their thermal properties were made in order to determine the contribution of each single unit of the mesogenic groups on the thermal properties of the polymers.

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Section: Resultsmentioning

confidence: 99%

Correlation of the thermal properties of main-chain liquid crystalline polymers with the symmetry and anisometry of their mesogens

Bilibin¹,

Solovjeva

Girbasova

et al. 2000

Macromol. Chem. Phys.

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“…In each the principal properties studied were the type and the thermal transitions of the liquid crystalline phase formed (ref. 7). In many cases, closely analogous model compounds were also prepared for comparison of their properties with those of the polymers, but quite often parallel structure-property relationships were not necessarily observed, as discussed below for several comparisons of this type.…”

Section: -Ementioning

confidence: 99%

Structure-order relationships in liquid crystalline polyesters

Lenz¹

1985

Pure and Applied Chemistry

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-Several series of polyesters containing mesogenic groups based upon aromatic ester triads and polymethylene flexible spacers have been prepared and characterized for their liquid crystalline properties in the melt. The relationships between repeating unit structure and the type of mesophases formed, as well as their transition temperatures and other thermodynamic properties, are discussed for both these main chain, liquid crystalline polymers and their model compounds. Particular consideration is given to the effects of small variations in the triad ester sequences, substituent effects and aspect ratio of the mesogenic group on thermotropic properties.

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“…In 1976, aromatic polyester 2 and polyazomethines were reported to exhibit thermotropic LC properties. 5,6 Since then, a variety of LC main-chain polymers have been extensively studied. [5][6][7] Representative molecular structures of the main-chain and side-chain LC polymers are shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Functional liquid-crystalline polymers and supramolecular liquid crystals

Kato

Uchida

Ichikawa

et al. 2017

Polym J

100

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The design and functions of liquid-crystalline (LC) polymers with classifying them into conventional-, supramolecular-, dendriticand network-type LC polymers are described. LC polymers show new functions as new devices in the field of energy and environment by incorporating mesogenic moieties exhibiting photonic, electronic and ionic functions. Supramolecular LC polymers show dynamic and unique properties because the mesogenic moieties are built with non-covalent interactions. Dendritic-type LC polymers exhibit liquid crystallinity by nanosegregation of aromatic and aliphatic moieties. Dendritic fork-like mesogens have also been prepared. A variety of nonmesogeic functional building blocks including fullerene, π-conjugated moieties, catenane, rotaxane and others can be incorporated into LC phases by attaching these dendritic moieties. LC networks are constructed in situ polymerization of polymerizable nematic or nanostructured liquid crystals. The specific characteristics of the LC networks have generated new research trends to develop well-defined polymers that exhibit optical, transport and separation properties. In these materials, through suitable design of LC monomers, the preservation of smectic, columnar and bicontinuous cubic phases has been successfully used for the development of membranes with one-dimensional, two-dimensional and three-dimensional nanostructures.

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Synthesis and Properties of Thermotropic Liquid Crystal Polymers with Main Chain Mesogenic Units

Cited by 90 publications

References 36 publications

Correlation of the thermal properties of main-chain liquid crystalline polymers with the symmetry and anisometry of their mesogens

Correlation of the thermal properties of main-chain liquid crystalline polymers with the symmetry and anisometry of their mesogens

Structure-order relationships in liquid crystalline polyesters

Functional liquid-crystalline polymers and supramolecular liquid crystals

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