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 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 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 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.