387 results about "Rotational viscosity" patented technology

The invention discloses a liquid crystal composition containing 2-methyl-3,4,5-trifluorophenyl liquid crystal compound and an application thereof. The liquid crystal composition disclosed by the invention comprises the following components in parts by weight: (1) 1-80 parts of one or a plurality of compounds of the general formula I, and (2) 10-70 parts of one or a plurality of compounds of the general formula II. The liquid crystal composition provided by the invention is a nematic liquid crystal composition, and has low rotary viscosity, large elastic constant and fast response speed.

Asphalt compositions and products in which the binder comprises tall oil materials possibly previously subjected to distillation, and/or oxidation, and/or combined with a polymer, the tall oil materials having a softening point in the range of 75 F to 400 F, a Needle Penetration value (0.1 mm) at 25 C of at least 1, a Rotational Viscosity at 275 F in the range of 650 cps to 8,000 cps, and a water solubility of less than 10 percent.

The invention discloses a liquid crystal compound containing benzoxazole and difluoromethylenedioxy bridged linkage (-CF2O-) and a preparation method and application of the liquid crystal compound. The structural general formula of the compound is as formula I. The compound is relatively stable in structure, and has a wide temperature range of the liquid crystal state, good intersolubility at low temperature and large positive dielectric anisotropy delta epsilon. When the compound is used in an optical element, low threshold voltage and small rotary viscosity gamma can be achieved. Thus, the material of a liquid crystal composition and the performance of a display can be improved, and the liquid crystal compound containing benzoxazole and the difluoromethylenedioxy bridged linkage plays a significant role in the achievement of rapid response of the display. A liquid crystal composition containing the compound can be applied to the production of a liquid crystal display which is low in driving voltage, wide in temperature range and rapid in response.

The invention relates to a negative dielectric nematic-phase liquid crystal composition. The liquid crystal composition contains at least one compound represented by a general formula I and at least one compound represented by a general formula II; in the general formula I, each of R<1> and R<2> separately represents a C1-C12 straight-chain alkyl group, a straight-chain alkoxy groups or a C2-C12 straight-chain alkenyl group, each of L<1> and L<2> separately represents H or F, and n<1> is equal to 0 or 1; and in the general formula II, each of R<3> and R<4> separately represents a C1-C12 straight-chain alkyl group, a straight-chain alkoxy group or a C2-C12 straight-chain alkenyl group, and each of ring A<1> and ring A<2> separately represents trans-1,4-cyclohexyl or 1,4-phenylene. The liquid crystal composition provided by the invention has low rotational viscosity, good low-temperature intersolubility and fast response time, is suitable for vertical alignment (VA) liquid crystal display devices such as VA/multi-domain vertical alignment (MVA)/patterned vertical alignment (PVA)/polymer stabilized vertical alignment (PSVA) liquid crystal display devices and in-plane switching (IPS) and fringe field switching (FFS) liquid crystal display devices, and is particularly suitable for IPS or FFS mode liquid crystal displays.

A liquid crystal composition and an AM liquid crystal display device are described. The liquid crystal composition contains a specific compound having a small viscosity as a first component, may further contain a specific compound having a large negative dielectric anisotropy as a second component and a specific compound having a small viscosity as a third component, and has a negative dielectric anisotropy and a ratio of rotational viscosity to an elastic constant in the range of 4.2 GPa·s/N or lower. The liquid crystal display device includes the composition.

The invention relates to the field of liquid crystal materials and particularly relates to a liquid crystal composite and application thereof. The liquid crystal composite provided by the invention comprises the following components in parts by weight: (1) 1-40 parts of a compound represented by the general formula (I), (2) 10-80 parts of a compound represented by the general formula (II) and (3) 1-50 parts of a compound represented by the general formula (III), wherein the compound represented by the general formula (I) is a compound containing 1,3-dioxane and a difluoromethoxy bridge-bond compound. The liquid crystal composite provided by the invention has low rotary viscosity and large elastic constant, shows relatively short response time and can be used in quick-response liquid crystal displays with a plurality of display modes and display effects of the liquid crystal displays can be significantly improved when the liquid crystal composite is applied in TN-mode, IPS-mode or FFS-mode displays.

The invention discloses a liquid crystal compound containing dihydrobenzofuran and a preparation method and application thereof. The structural general formula of the compound is shown in a formula I (shown in a drawing). The compound is more stable in structure and has a wide liquid crystal state temperature range, better low-temperature intersolubility and higher dielectric anisotropy [delta]epsilon; and when the compound is applied to an optical device, a lower threshold voltage and low rotational viscosity gamma1 can be realized, and the performance of liquid crystal composition materials and displays can be improved, so that the compound has important significance for quick response of the displays. A liquid crystal composition containing the compound can be applied to the preparation of liquid crystal displays with low driving voltage, wide temperature range and high response speed.

The invention relates to a liquid crystal composition, a liquid crystal display element comprising the liquid crystal composition and a liquid crystal display, and belongs to the field of liquid crystal displaying, wherein the liquid crystal composition comprises one or more compounds represented by formula i, one or more compounds shown in formula II, one or more compounds represented by formulaIII, and one or more compounds represented by formula IV; the liquid crystal composition has low rotational viscosity, good photoelectric performance, high dielectric anisotropy and high response speed.

There is provided a liquid crystal display device which enables reductions in image sticking and droplet stains caused in production thereof without degradation of properties such as dielectric anisotropy, viscosity, the upper limit of the temperature of nematic phase, and rotational viscosity (γ₁); and there is also provided a method for manufacturing such a liquid crystal display device. The liquid crystal display device is characterized in that a liquid crystal layer containing a liquid crystal composition is disposed between a substrate provided with a common electrode and a color filter layer and another substrate provided with a plurality of pixels each having a pixel electrode, each of the substrates is not provided with an alignment film but provided with an orientation controlling layer composed of at least two polymerizable compounds, each of the pixels has two or more regions having different directions of pretilt, and the liquid crystal composition contains a compound represented by General Formula (I) and a compound represented by General Formula (II).

The invention discloses a liquid crystal compound containing dioxane derivatives. The compound has a general structural formula as shown in a formula I, is more stable in structure, wide in liquid crystal state temperature range, better in low-temperature intersolubility and larger in dielectric anisotropy delta epsilon, can achieve lower threshold voltage and low rotary viscosity gamma 1 during the use of an optical device and improve the performance of a liquid crystal composition and a display, and has great significance to quick response of the display. The liquid crystal composition containing the compound can be applied to preparation of the liquid crystal display with low drive voltage, wide temperature range and high response speed.

The invention relates to a method for qualitatively testing the molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE). In the method, a set of method for comparing and judging the molecular weight distribution of the UHMWPE by combining the limiting viscosity number with kinetic viscosity of a raw material and testing kinetic viscosity by using a rotary viscometer according to the relation between the solubility and molecular weight dependence of the UHMWPE is designed. Compared with the prior art, the method is convenient and easy to operate, and is suitable for qualitatively judging the molecular weight distribution of a contrast sample.

The invention discloses liquid crystal compounds containing 2-alkyltetrahydropyrane structure, and a preparation method and application thereof. The structural general formula of the compounds is disclosed as Formula I. The compounds have the advantages of stable structure, wide liquid-crystal-state temperature range, favorable low-temperature mutual solubility and high clearing point, can implement low threshold voltage and low rotary viscosity gamma 1 when being used in optical devices, and can improve the properties of the liquid crystal composition material and display device, thereby having an important meaning in quick response of display devices. The liquid crystal composition containing the compounds can be used for preparing liquid crystal displays with low drive voltage, wide temperature range and high response speed.

The invention relates to a novel negative dielectricity liquid crystal compound having a structural formula I as shown in the description, relates to a liquid crystal medium comprising at least one compound having the structural formula I and also relates to an electro-optic display containing the liquid crystal medium. The compound has the advantages of high negative dielectricity, larger K value and lower rotational viscosity and is suitable for fast-response VA liquid crystals, especially VA-TFT smf VA-IPS LCD liquid crystal display.

The invention provides a liquid crystal compound containing a dibenzofuran ring. The liquid crystal compound has a structure as shown in the formula I in the description. The liquid crystal compound containing the dibenzofuran ring has larger dielectric anisotropy, lower rotational viscosity and higher clearing point, and the intersolubility among monomers is good, thereby being favorable for preparing a composition. A liquid crystal composition containing the liquid crystal compound has greater dielectric anisotropy, can more effectively reduce the driving voltage of a device, simultaneouslyhas lower rotational viscosity and shorter response time, has good chemical stability and thermal stability, has good application in a display device, and especially has good application in a displaydevice in a TFT mode.

The invention provides a liquid crystal compound shown in a first formula, and a liquid crystal mixture comprising the compound, The liquid crystal compound with the characteristics shown in the firstformula and containing the lateral trifluoromethyl group not only has positive dielectric anisotropy (delta epsilon), suitable optical anisotropy (delta n), a high clearing point (CP), outstanding low-temperature intersolubility with other liquid crystals, low rotational viscosity (gamma 1), but also has good stability to ultraviolet rays, positive stability to high temperatures, and particularlyhas high vertical dielectric (epsilon vertical), the compound can be used for preparation of various types of liquid crystal compositions, the compound particularly has the advantages of good low-temperature solubility and high vertical dielectric (epsilon vertical) .

The invention provides a polymerizable compound shown in formula I, a polymerizable compound shown in formula II and polymer composition, shown in formula III, of polymerizable compounds. The polymercomposition can be matched with specific liquid crystal components to form liquid crystal composition and is particularly applicable to displays or PSVA liquid crystal composition applied in TVs as well as PSA-IPS liquid crystal composition in an IPS mode. Particularly, the polymerizable liquid crystal composition has good solubility and adjustable polymerization speed and morphology after polymerization, a material system formed by selected polymerizable components and liquid crystal components has low rotary viscosity, good photoelectric properties and high VHR after UV light irradiation, and problems of residual images and the like of displays are solved finally.

The invention provides a liquid crystal composition containing a difluoromethoxy bridged bond and a -O(CH2)nF unit structure. The liquid crystal compound has a structure shown in a formula I as follows: R-Al-Z1-A2-Z2-A3-CF2O-A4-Z3-A5-O(CH2)n-CH2F(I); the compound has the characteristics of being low in rotary viscosity and great in dielectric anisotropy; after the liquid crystal composition is applied, the dielectric anisotropy of the existing idiomatic liquid crystal composition can be further improved, and therefore, the liquid crystal composition has technical effect of lowering drive voltage of an apparatus.

The invention discloses a liquid crystal monomer containing deuterium substitution. The general structural formula of the liquid crystal monomer containing the deuterium substitution is indicated as in formula I. The liquid crystal compound indicated by the formula I has an ordinary physical property necessary to the compound, is stable to light and heat, wide in nematic phase, good in compatibility with other compounds, low in rotation viscosity gamma 1 and large in dielectric anisotropy, and particularly when the compound is matched with similar non-deuterium-substituted liquid crystal to use, the low-temperature solubility can be improved. An important significance on developing the large refractive index gamma 1 and medium dielectric anisotropy delta sigma is realized. The liquid crystal compound containing the compound indicated by the formula I is wide in temperature range of liquid crystal phase, small in viscosity, appropriate in refractive index anisotropy and low inn starting voltage.