57results about How to "Optically active" patented technology

The invention discloses an addition type photocuring organic silicon rubber composition. The addition type photocuring organic silicon rubber composition is prepared from, by mass, 30-100 parts of vinyl containing polysiloxane, 0-70 parts of filler, 5-30 parts of cross-linking agent, 0.1-1 part of catalyst with optical activity and 0.01-0.1 part of inhibitor. Photocuring organic silicon rubber is compared with other photocuring organic silicon materials, organosilicon polymer includes methyl vinyl polysiloxane, methyl vinyl organic silicone resin and hydrogen containing silicone oil, the photosensitive perssad of photoresponse is Si-CH=CH2 and Si-H, the prepared organic silicon rubber can be widely used for the fields of electronic component coating, embedment protection and the like, and curing time is short.

The invention provides a method for preparing polycarbonate with optical activity by catalyzing asymmetric alternative copolymerization with racemic oxiraneic hydrocarbon and carbon dioxide, employing bi-component catalyst with chirality catalyzing the antimer of the racemic oxiraneic hydrocarbon selectively at the temperature of 0~80 DEG C, and copolymarizating with carbon dioxide to preparepolycarbonate with optical activity. The bi-component catalyst consists of host catalyst, the chirality quadridentate schiff bases metallic complexe, SalenMX; and the catalyst promoter, the salt of R1R23YX1 or (R13P)2YX1, with the proportion in moles 0.2~10:1. The proportion between catalyst and oxiranic hydrocarbon is 1:500~10000 in moles, the initial pressure of carbon dioxide is 0.1~4.0 Mpa, and the reacting for 0.5~24 hours. The method is characterized by the temperate reaction condition and the simple process; the simple synthesis of the chirality catalyst and low production cost and high reactive and suitable for industrial application.

The invention provides a method for splitting 2-heterocycle substituted dihydro pyrimidine racemic body, which comprises the following steps: (1) putting the 2-heterocycle substituted dihydro pyrimidine racemic body and 1,1'-Binaphthyl-2,2'-diyl hydrogenphosphate resolving agent with optical activity in a reactor, and adding a solvent; (2) stirring the mixture; (3) filtering the mixture, concentrating a mother solution and standing the mother solution; (4) filtering and concentrating the mother solution to be dry; and (5) refining. The single chiral 2-heterocycle substituted dihydro pyrimidine compounds prepared by the splitting method has the product yield about 20 percent and the optical purity above 98 percent; and the splitting method has the advantages of stability, high yield, high optical purity, simple and convenient operation, strong practicability and easy industrialization.

The invention provides a method for splitting 2-heterocycle substituted dihydro pyrimidine racemic body, which comprises the following steps: (1) putting the 2-heterocycle substituted dihydro pyrimidine racemic body and O,O-diaroyl tartaric acid resolving agent with optical activity in a reactor, adding a solvent and stirring the mixture; (2) filtering the mixture, concentrating a mother solution and standing the mother solution; (3) filtering and concentrating the mother solution to be dry, and obtaining a concentrate; and (4) refining the concentrate. The splitting method adopted for preparing single chiral 2-heterocycle substituted dihydro pyrimidine compounds has the product yield more than 20 percent and the optical purity above 98 percent; and the splitting method has the advantages of stability, high yield, high optical purity, simple and convenient operation, strong practicability and easy industrialization.

The invention provides a chiral nano film and a preparation method and application thereof. The preparation method of the chiral nano film comprises the steps that a one-dimensional nanomaterial solution is spread on a lower phase in a Langmuir-Blodgett groove, a slide barrier located on the surface of the lower phase pushes a one-dimensional nanomaterial to move on the surface of the lower phase after the solvent is completely volatilized, the area of the one-dimensional nanomaterial is compressed to obtain a one-dimensional nanomaterial assembly film consistent in orientation; a Langmui-Schaeffer transfer method is adopted to transfer the assembly film to a substrate, and the chiral film provided with at least two layers of assembly films is obtained, wherein the assembly films are sequentially staggered clockwise or anticlockwise. The chiral film has ultra-high optical activity, an anisotropy factor is as high as 0.3, the optical activity is highest compared with chiral materials obtained by adopting an existing assembly means, and the preparation method is simple and has universality and wide application prospect.

The invention discloses a liquid crystal display panel and a liquid crystal display device. A display area of the liquid crystal display panel comprises a pixel layer, a liquid crystal layer, a firstpolaroid and an optical sensor which are arranged in sequence. The first polaroid comprises a first polarizing unit and a second polarizing unit, wherein the polarizing directions of the first polarizing unit and the second polarizing unit are perpendicular and adjacent. The liquid crystal layer comprises a first liquid crystal unit corresponding to the first polarization unit and a second liquidcrystal unit corresponding to the second polarization unit, the polarization direction of polarized light passing through the first liquid crystal unit is kept unchanged, and the polarization direction of polarized light passing through the second liquid crystal unit rotates by 90 degrees; the pixel layer comprises a transparent area corresponding to the first liquid crystal unit and a pixel areacorresponding to the second liquid crystal unit; and the optical sensor is arranged corresponding to the first polarizing unit. According to the optical sensor, a collimation light path is provided for the optical sensor through the transparent area, the first liquid crystal unit and the first polarization unit which are correspondingly arranged, the optical crosstalk is avoided, and the LCD under-screen sensing technology is achieved.

The invention relates to preparation and application of a phenylalanine dipeptide-graphene quantum dot composite material. The preparation includes the following steps: preparation of graphene quantum dots, preparation of the phenylalanine dipeptide-graphene quantum dot composite material, preparation of a phenylalanine dipeptide-graphene quantum dot composite material modified electrode, and electrochemical method identification of tryptophan enantiomers. The beneficial effects are that the preparation method of the phenylalanine dipeptide-graphene quantum dot composite material modified electrode is simple and environment-friendly, and the phenylalanine dipeptide-graphene quantum dot composite material modified electrode has better tryptophan enantiomer recognition ability because of some optical rotation of the phenylalanine dipeptide.

The invention discloses a chiral geminal disilicide alkane compound containing four silicon-hydrogen bonds, shown as a formula VI, and discloses a synthesis method of the chiral geminal disilicide alkane compound. For the first method, in inert gas, a vinyl silane type compound shown as a formula V and silane trihydride shown as a formula IV are used as raw materials; a chiral CoX2-IIP complex compound is used as a catalyst; under the existence of reducing agents, reaction is performed to prepare VI. For the second method, in the inert gas, alkyne shown as a formula I, silane trihydride shownas a formula II and silane trihydride shown as a formula IV are used as raw materials; CoY2, bi(2-diphenyl phosphenyl) ether and a chiral CoX2-IIP complex compound are used as catalysts; under the existence of reducing agents, reaction is performed to prepare a formula VI. The method has the advantages of mild reaction conditions, operation simplicity and convenience, high atom economy, excellentproductive rate (57 to 84 percent), high regioselectivity (greater than 19:1) and high enantioselectivity (91.6 to 98.8 percent ee). The formulas are shown in description.

The invention discloses an azo liquid crystal monomer with reaction properties and a preparation method thereof. The structural formula of the compound is listed, wherein, the n1 is an integer between 6 and 14, n2 is an integer between 1 and 7 and n3 is an integer between 1 and 5; the substitute position of the dilute oxygen is the adjacent position or contraposition of alkoxy; a synthesis method of the compound is that: the substituted dilute oxygen pairs by alkoxy benzoic acid is adopted as raw material to obtain aniline compounds by processes of amidation and hoffman degradation reaction; then low temperature diazotization coupling is carried out to obtain the new liquid crystal compound. A central bridge bond of the liquid crystal monomer of the invention is the azo group and has optical activity and a side chain of the invention is double bonds with reactivity; at last, novel waist connected type macromolecule liquid crystal and liquid crystal elastomer are made by polymerization or graft the double bonds to macromolecule main chain. The invention has easy obtained raw material, simple and safe operation and being applied to such fields as non-linear optical materials, optical information storage, optical switch, display, artificial muscles, shape memory and biomedicine.

The invention provides an optical element parallel with the electric field direction parallel to a liquid crystal layer. The optical element with the electric field direction parallel to the liquid crystal layer comprises an upper base plate, a lower base plate and the liquid crystal layer, wherein the lower base plate is positioned below the upper base plate, and the liquid crystal layer is positioned between the upper base plate and the lower base plate and comprises a positive or negative liquid crystal medium, and the liquid crystal medium comprises at least one optical activity component. According to the optical element, liquid crystal molecules in an electric field can obtain high power so as to rapidly rotate 90 degrees with low driving voltage, the use requirements of a display on the low driving voltage can be met, and a liquid crystal composition between the upper base plate and the lower base plate has low viscosity and a high clearing point.

The invention discloses a method for constructing a tartaric acid coating layer with a corrosion protection function on the surface of magnesium metal. The method comprises the following steps: A. polishing and carrying out ultrasonic cleaning on a pickling solution; B. soaking the magnesium metal obtained in the step A in NaOH solution with a concentration of 3mol/L, placing the NaOH solution in a water bath environment at 50-70 DEG C, standing for 11-14h, carrying out alkaline activation pre-treatment, then thoroughly washing the magnesium metal, and then drying the magnesium metal; C. preparing a tartaric acid solution with a concentration of 5-25g/L, and adjusting the pH value of the tartaric acid solution to achieve 5-9 by virtue of NaOH with a concentration of 1mol/L; and D. soaking the magnesium metal obtained in the step B in the tartaric acid solution prepared in the step C, placing the tartaric acid solution in a water bath environment at 30-80 DEG C, standing for 3-12h, then taking out the magnesium metal and thoroughly washing the magnesium metal by virtue of deionized water, and carrying out vacuum drying; and the tartaric acid coating layer with the corrosion protection function is successfully constructed on the surface of the magnesium metal. After the surface of the magnesium metal is modified through the method, the corrosion speed of a corrosive environment for the magnesium metal can be much effectively controlled, so that the corrosion-degradation period of the magnesium metal is matched with the treatment-recovery period of organisms when the magnesium metal is used as a biodegradable medical material.

A beta-functional group multi-substituted 1-propen-3-ol and its synthesis are disclosed. The process is carried out by carbon-metal reacting Grignard reagent with diolefine to generate carbon-carbon bond and carbon-metal bond, and reacting with various reagents to obtain a series of beta-functional group multi-substituted propen compound. It's simple and easy, has better regional and spatial selectivity and can be used for various substituted propens.

The invention discloses a preparation method of an optically active AIE fluorescent material water-based polymer. The preparation method comprises the following steps: A, synthesizing an aldehyde group AIE fluorescent compound by utilizing a Suzuki coupling reaction between phenylboronic acid and bromobenzene; B, synthesizing a methoxy fluorescent compound by utilizing a condensation reaction between an aldehyde group and phenyl acetonitrile, and further demethylating methoxy through BBr3 to generate hydroxyl; C, introducing tertiary hydroxyl into the fluorescent compound through a nucleophilic substitution reaction between benzene hydroxyl and fatty chlorine to generate a corresponding tertiary hydroxyl AIE fluorescent compound; D, introducing an acrylic acid element into the fluorescentcompound through a selective ester exchange reaction under the catalysis of lipase B to obtain an AIE fluorescent monomer with optical activity; and E, preparing the AIE fluorescent polymer with optical activity through RAFT active polymerization. The fluorescent dye and polymer have optical activity.

The invention relates to the technical field of optical materials, in particular to a preparation method of chiral-magnetic hydrogel, which comprises the following steps: modifying magnetic nanoparticles by using a chiral ligand to obtain chiral ligand modified magnetic nanoparticles; mixing the chiral ligand modified magnetic nanoparticles with a hydrogel monomer, a cross-linking agent, a catalyst and an initiator to prepare magnetic hydrogel; the prepared magnetic hydrogel is placed in a parallel magnetic field to be directionally magnetized, and the chiral-magnetic hydrogel is obtained. After the magnetic hydrogel prepared by the method is directionally magnetized, a local magnetic field can be formed in the hydrogel, the optical activity of the material can be adjusted by the local magnetic field, and the overall optical activity of the material also changes along with the change of the magnetic field intensity.