- Novel Reactive Mesogen Compound, Composition For Negative Dispersion Compensation Film Comprising The Same, And Negative Dispersion Compensation Film Comprising The Same
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The present invention relates to a hydrogen bonding mixture for a reverse wavelength dispersion compensation film exhibiting reverse wavelength dispersion characteristics according to a self-assembly arrangement between a host-guest reactive mesogen capable of hydrogen bonding as one layer structure and a compensation film including the same. Films produced by the present invention induce self-assembly between more stable host-guest reactive mesogens due to intermolecular host-guest interactions through hydrogen bonding. A wavelength dispersion compensation film is provided to have improved orientation and to have a wavelength dispersion characteristic close to an ideal value by comparison with an existing one-layer reverse wavelength dispersion compensation film. , The reverse wavelength dispersion compensation film proposed in the present invention can be used for preventing an OLED or viewing angle of LCD. The reverse wavelength dispersion compensation film of the present invention can reduce the thickness of the device as compared with an existing laminated reverse wavelength dispersion compensation film. (by machine translation)
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Paragraph 0144; 0149
(2020/08/19)
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- COMPOUND, CURED PRODUCT, POLYMER, PHOTO-ALIGNMENT FILM, OPTICALLY ANISOTROPIC BODY AND LIQUID CRYSTAL DISPLAY ELEMENT
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A compound and a polymer which can each form a photo-alignment film having excellent ability of controlling alignment, a photo-alignment film obtained using the polymer and an optically anisotropic body and a liquid crystal display element each having the photo-alignment film are provided. A compound represented by the general formula (1). In the formula, P represents a polymerizable group, Z and Z1 represent divalent linking groups, A and A1 represent divalent cyclic groups, and X1 to X5 each independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a hydroxy group, a nitro group, a cyano group or an alkyl group having 1 to 40 carbon atoms which may have a substituent, provided that X1, X2, X4 and X5 are not simultaneously hydrogen atoms.
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Paragraph 0192
(2018/08/30)
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- Triphenylene derivative and use thereof
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A triphenylene derivative of general formula (I) or general formula (II) which can be used as a component of liquid crystal medium and the use thereof are provided in the present invention. This compound can be used to form a negative discotic liquid crystal composition having a suitable temperature range of liquid crystal phase and a lower clearing point, which can be used in TFT liquid crystal display as an optical compensation film (cell) material.
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Page/Page column 13; 17
(2016/05/19)
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- Synthesis and mesophase characterization of novel methacrylate based thermotropic liquid crystalline monomers and their polymers
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A new series of side chain methacrylate monomers with a three phenyl ring core connected by an ester with a terminal alkoxy chain and hexamethylene spacer are synthesized by a multistep synthetic route. The corresponding polymers are realized by free radical solution polymerization. Two structurally similar mesogens are also synthesized for use as models to study the influence of the methacrylic unit on the mesophase characteristics. The molecular structure of the intermediates, monomers as well as the polymers is unambiguously confirmed by Fourier-transform infrared (FT-IR), solution 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and by elemental analysis. The mesophase characteristics of all of the monomers and polymers are determined by hot-stage optical polarized microscopy (HOPM) and differential scanning calorimetry (DSC). These investigations revealed the existence of enantiotropic nematic (N), smectic A (SA) and smectic C (SC) mesophases. Furthermore, for a representative monomer and polymer, the presence of the smectic phase is confirmed by variable temperature X-ray diffraction (XRD) where a characteristic layer ordering is noticed. The molecular weight of the polymers is determined by gel permeation chromatography (GPC) and the values are found to be typically in the range of 2.0 × 103 to 3.7 × 103. The mesogenic polymers are also found to be stable up to 320 °C by thermogravimetric analysis (TGA). the Partner Organisations 2014.
- Siva Mohan Reddy,Narasimhaswamy,Mohana Raju
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p. 4357 - 4364
(2014/12/09)
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- Pendant triazole ring assisted mesogen containing side chain liquid crystalline polymethacrylates: Synthesis and characterization
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Two series of click chemistry assisted alkoxymethyl-1H-[1,2,3]-triazol-1-yl containing sidechain liquid-crystalline polymethacrylates were synthesized by free radical polymerization technique. Mesogen was linked to backbone through various spacer units. Monomers and polymers were characterized by FT-IR, 1H and 13C-NMR spectral techniques. Thermal stability of polymers was confirmed by thermogravimetric analysis. Mesomorphic property and phase transition temperature of polymers were analysed by differential scanning calorimetry and polarized optical microscopy. Phase transition temperature and mesomorphic property of polymers with respect to insertion of polar alkoxy group on terminal triazole ring and spacer length between backbone and mesogen were investigated. Polymers exhibited grainy like textures under polarized optical microscopy. Spacer length between mesogen and backbone alters phase transition temperature of the polymers. Indian Academy of Sciences.
- Palani,Saravanan,Kannan
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scheme or table
p. 81 - 89
(2012/02/01)
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- Linearly polarised organic light-emitting diodes (OLEDs): Synthesis and characterisation of a novel hole-transporting photoalignment copolymer
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We describe the synthesis and characterisation of a novel hole transporting photoalignment copolymer for linearly polarised emission. The copolymer has a coumarin side-chain which undergoes (2 + 2) cycloaddition on irradiation with ultraviolet light. A fluorene side-chain, whose ionisation potential is well matched to the work-function of indium tin oxide, provides hole transporting properties. Polarised green electroluminescence was obtained by spin coating a novel polymerisable and light-emitting liquid crystal onto the photoaligned copolymer. A polarisation ratio value of 13 : 1 and a polarised irradiance of 200 cd m-2 was obtained at 9 V. Polarised red emission is also described in a guest-host configuration. The spatial patterning of the polarisation direction is also shown. The Royal Society of Chemistry 2005.
- Aldred, Matthew P.,Vlachos, Panos,Contoret, Adam E. A.,Farrar, Simon R.,Chung-Tsoi,Mansoor, Bassam,Woon, Kai L.,Hudson, Robert,Kelly, Stephen M.,O'Neill, Mary
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p. 3208 - 3213
(2007/10/03)
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- Electroluminescent nematic polymer networks with polarised emission
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Electroluminescence with a polarisation ratio of 12:1 from a uniformly aligned nematic network is reported. Diene photo-active end-groups were used, which polymerise by a selective cyclisation reaction. Surface alignment was achieved for the first time using a doped polymer photoalignment layer, oriented by exposure to polarised UV light. Threshold voltages between 2 V and 8 V were found and a brightness of 90 cd m-2 was obtained. Both the PL and EL intensities were higher after photochemical crosslinking.
- Contoret, Adam,Farrar, Simon,Jackson, Perregrin,Kelly, Stephen M.,Khan, Sultan,Nicholls, Edward,Oneill, Mary,Richards, Gary
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p. 511 - 518
(2007/10/03)
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- Phase Transitions of Liquid Crystalline Polymethacrylates having 4-(4-Substituted Phenylazo)phenyl Benzoate in a Mesogenic Side Chain
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Two types of liquid crystalline polymethacrylates, having 4-(4-substituted phenylazo)phenyl benzoate in a mesogenic side chain, were prepared.The relationship between the shape of the mesogenic side chain and the liquid crystallinity was studied. - Keywords: liquid crystalline polymethacrylate, nematic, smectic, thermal property, shape of mesogenic side chain
- Ujiie, Seiji,Maekawa, Kazuhiko,Takahashi, Satoshi,Iimura, Kazuyoshi
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p. 477 - 482
(2007/10/02)
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- SYNTHESIS AND THERMAL PROPERTIES OF SIDE CHAIN TYPE LIQUID CRYSTALLINE POLYMERS WITH CHIRAL UNIT IN THE FLEXIBLE MOIETY
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This paper is concerned with the synthesis and thermal properties for five families of side-chain type liquid crystalline polymers.All these side-chain type polymers showed an enantiotropic mesomorphic nature.A sharp reflexion was observed in the small angle region, whereas a broad halo or a relatively sharp peak was also detected in the wide angle region for all the polymers.The experimental values of the thickness of the smectic layer which can be easily assigned by the polarizing microscopic measurements were smaller than that of the calculated ones.This difference would be caused from the tilted arrangement in the smectic layer or smectic A like structure in which the side chain would be overlapped.
- Koide, Naoyuki,Uehara, Keiichi,Iimura, Kazuyoshi
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p. 151 - 162
(2007/10/02)
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- Molecular Structural Effects on Mesophase Behaviour of Monomers and Polymers: Azo vs Olefinic
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Two monomers containing two phenylene rings, two linking units, and one phenyl group have been synthesized.The linking units were ester and azo functionalities for one of the monomers, and ester and olefinic for the other.Phase transitions, range of mesophase stabilities, textures, enthalpy, and/or entropy changes of the two mesogens are compared for the monomeric and polymeric forms.Thermal transitions observed by differential scanning calorymetry were confirmed by optical microscopy.The results reveal that while there are markedly different structural effects in the monomers, such effects are considerably diminished in the polymers.However, the polymers had substantially different textures as confirmed by a solution-cast miscibility study.The data illustrate that mesogenic systems containing three phenyl rings and two linking units as opposed to two phenyl rings and one linking unit do allow one to better assess molecular structural effects on mesophase behavior. - Keywords: comblike polymers, liquid crystals, structure-mesophase relationships.
- Mariam, Yitbarek H.,Pemawansa, Kariyawasam P. W.,Okoh, Fred,Bota, Kofi B.
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