Structure and Dilution of Mesogenic Side Chains in Liquid Crystalline Polysiloxanes

Diele, Siegmar; Oelsner, Steffi; Kuschel, Frank; Hisgen, Bernd; Ringsdorf, Helmut

doi:10.1080/00268948808070381

Cited by 43 publications

(1 citation statement)

References 3 publications

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“…For complexes forming a lamellar phase, the interlayer distance ( d 001 ) decreases with DN, which can be explained by the thinning of the P4VP layer. Similar behavior was observed previously for the side-chain liquid crystalline polymers by dilution of the mesogenic moiety . This can be explained by chain stretching or a decrease of the number of P4VP polymer chains per smectic layer with increasing DN.…”

Section: Resultssupporting

confidence: 87%

Self-Organization of Polybases Neutralized with Mesogenic Wedge-Shaped Sulfonic Acid Molecules: An Approach toward Supramolecular Cylinders

et al. 2006

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Complexes consisting of poly(4-vinylpyridine) and mesogenic wedge-shaped ligands 4'-[3",4",5"-tris(dodecyloxy)benzoyloxy]azobenzene-4-sulfonic acid and 4'-[3",4",5"-tris(octyloxy)benzoyloxy]azobenzene-4-sulfonic acid have been prepared with different monomer/ligand ratios. Upon protonation of the poly(4-vinylpyridine) chains by the wedge-shaped sulfonic acid molecules a hypsochromic and hyperchromic effect was observed with the pi-pi* transition of the azo-chromophor, allowing us to monitor the neutralization process by means of UV-vis spectroscopy in solution. The changes of the absorption characteristics implied a conformational change of the polymer backbone. In the bulk the interaction between pyridine and sulfonic acid moieties was proved by FT-IR spectroscopy. Polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction measurements were used to study the bulk structure of the complexes. The complexes formed a liquid crystalline lamellar phase at low degrees of substitution, while a hexagonal columnar mesophase was observed at degrees of neutralization of 80% and higher.

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Section: Resultssupporting

confidence: 87%

Self-Organization of Polybases Neutralized with Mesogenic Wedge-Shaped Sulfonic Acid Molecules: An Approach toward Supramolecular Cylinders

et al. 2006

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Self‐compacting smectic polymers. An unusual temperature dependence of interlayer distance for side chain polysiloxanes in sm a and sm b phases

Kozlovsky

Haase

1996

Acta Polymerica

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A prominent reduction of the layer thickness, d,, in the Sm A and Sm B phases with increasing temperature has been observed for a series of side chain po1ymers.The maximum decrease in dl value for one of the copolymers is -7 A, i.e. 15% of its total value.The influence of the chemical structure of the main chain and side groups on the effect has been studied. Models have been proposed for packing of mesogenic side groups at different temperatures.PSD linear position scanning detector [lo]. The interlayer distance, dl, was estimated from the first small angle Bragg diffraction peak.

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The Influence of the Shape and the Incompatibility of Molecular Moieties on the Structure of Smectic Mesophases

Pelzl

Diele

Lose

et al. 1997

Cryst. Res. Technol.

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For selected compounds with perfluorinated chains the structure of smectic phases was investigated by X‐ray diffraction measurements. For rod‐like compounds with only one terminal perfluorinated chain the incompatibility of the hydrocarbon and the fluorocarbon moieties leads to a segregation of both parts which can be considered as microphase separation. For swallow‐tailed compounds the structure of smectic phases depends on the position and the length of the perfluorinated chains. If the steric interaction dominates an antiparallel packing of the molecules within the smectic layers is favoured. If the incompatibility of the hydrocarbon and fluorocarbon moieties is of importance the smectic layers are distorted and at lower temperatures the layer structure is transformed into a columnar structure.

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Structure and Dilution of Mesogenic Side Chains in Liquid Crystalline Polysiloxanes

Cited by 43 publications

References 3 publications

Self-Organization of Polybases Neutralized with Mesogenic Wedge-Shaped Sulfonic Acid Molecules: An Approach toward Supramolecular Cylinders

Self-Organization of Polybases Neutralized with Mesogenic Wedge-Shaped Sulfonic Acid Molecules: An Approach toward Supramolecular Cylinders

Self‐compacting smectic polymers. An unusual temperature dependence of interlayer distance for side chain polysiloxanes in sm a and sm b phases

The Influence of the Shape and the Incompatibility of Molecular Moieties on the Structure of Smectic Mesophases

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