Cholesteric Polymers with Mesogenic Side Groups

Freidzon, Ya.S.; Boiko, N. I.; Shibaev, Valéry; Platé, N.A.

doi:10.1007/978-1-4899-2299-1_18

Cited by 10 publications

(11 citation statements)

References 6 publications

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“…Synthesis: Nematogenic phenylbenzoate (I) and cholesterol-containing (II) monomers were synthesized according to procedures described earlier [10,11].…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, in order to make a symmetric tipped rod, an extra 1 C of gold must be applied to the second tip. [10] Some minor variation (±8 %) in rod length was still observed due in part to ªhot spotsº in the sonicator bath, where agitation due to standing waves is particularly violent. This effect was minimized by using a sweep frequency sonicator (Crest Ultrasonics), which modulates the sonication frequency ±1 kHz.…”

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confidence: 99%

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Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Bobrovsky

Boiko

Shibaev³

1999

Adv. Mater.

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The thermal and chemical reversibility of the photochromic process displayed by spiropyran (see Figure) is combined with the helical supramolecular architecture of a cholesteric polymer to produce a copolymer that can be used for reversible data recording on colored backgrounds. The cholesteric structure is able to reflect a broad spectrum of visible light, which should allow the realization of the special filters and reflectors required for complex multicolor optical display devices.

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“…Synthesis: Nematogenic phenylbenzoate (I) and cholesterol-containing (II) monomers were synthesized according to procedures described earlier [10,11].…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Bobrovsky

Boiko

Shibaev³

1999

Adv. Mater.

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“…Uponn cooling, selective reflection peak shifts to a long-wavelength region, and this shift is associated with enhanced fluctuations of a smectic order with decreasing temperature and with approaching the nematic-smectic phase transition. Earlier, this behavior was usually observed for cholesterol-containing copolymers 45 and for copolymers with three-ring menthyl fragments. 38,41 The effect of temperature on the helix pitch is most pronounced for the C 3 -Mt blends.…”

mentioning

confidence: 55%

Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant

Bobrovsky¹,

Pebalk²,

Barmatov³

et al. 1999

J. Polym. Sci. A Polym. Chem.

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A family of a new hydrogen‐bonded complexes based on comb‐shaped LC copolymers containing the monomer units of cyanobiphenyl derivative and n‐alkyloxy‐4‐oxybenzoic acid with a chiral dopant on the base of 4‐pyridinecarboxylic acid and L‐menthol, was prepared. At concentrations of chiral groups 1–25 mol %, the induction of cholesteric phase was observed. Temperature dependences of selective light reflection wavelengths were studied, and helix twisting power was calculated. Depending on the type of copolymer nematic matrix, this value is changed in the range from 12.1 to 19.6 µm−1. It was shown that an increase of a distance between the chiral dopant and the main polymer chain results in a lower values of helix twisting power. With respect to optical properties, the chiral nematic phase in the hydrogen‐bonded complexes is comparable to classical cholesteric copolymers, in which the chiral group is covalently bound to polymer chain. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3215–3225, 1999

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“…We shall now illustrate possibilities of this theory by two experiments: optical rotation in the monodomain and polydomain samples of cholesteryl nonanoate, and optical rotation in polydomain samples of the blue phases of the liquid crystalline polymeric material polycholesteryl acrylate (PCA-10) as described in [57]. Figure 13 shows the optical rotation in the blue phases of cholesteryl nonanoate at constant wavelength for monodomain and polydomain samples.…”

Section: Structural Opticul Rotation In Cholesteric and Blue Phasesmentioning

confidence: 94%

Spatial dispersion in chiral liquid crystals. Effects of higher orders

Демихов

Stegemeyer

1993

Liquid Crystals

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Spatial dispersion effects in chiral liquid crystals are reviewed. New spatial dispersion phenomena are observed in the vicinity of the Bragg reflection wavelength-an anomaly of the refractive index and an optical anisotropy of the cubic blue phases. These effects can be explained by taking into account the spatial dispersion correction of the dielectric tensor of the medium of higher orders in the ratio of the light wave vector to the structural wave vector of chiral phases.

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Cholesteric Polymers with Mesogenic Side Groups

Cited by 10 publications

References 6 publications

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Photosensitive Cholesteric Copolymers with Spiropyran-Containing Side Groups: Novel Materials for Optical Data Recording

Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant

Spatial dispersion in chiral liquid crystals. Effects of higher orders

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