188709-97-9Relevant articles and documents
Full-spectrum selective reflection annular side chain liquid crystal oligomer film and preparation method thereof
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Paragraph 0049; 0054; 0059-0060, (2021/08/06)
The invention discloses a full-spectrum selective reflection annular side chain liquid crystal oligomer film and a preparation method thereof. The preparation method comprises the following steps: respectively carrying out graft copolymerization on a chiral liquid crystal monomer and an achiral rod-like monomer or two chiral liquid crystal monomers and annular polymethyl hydrogen-containing siloxane to construct the full-spectrum selective reflection annular side chain liquid crystal oligomer film, the structural formula is shown as a formula I. The cyclic side chain liquid crystal oligomer can realize full-spectrum selective reflection in the heating process; at room temperature, the annular side chain liquid crystal oligomer film can realize full-spectrum selective reflection along with the change of an incident angle. The cyclic side chain liquid crystal oligomer prepared by the method has dual characteristics that dynamic full-spectrum selective reflection changes along with temperature and incident angle, and has a wide application prospect in the optical field, the preparation process is safe to operate, and reaction conditions are mild.
Method for synthesizing monomenthyl succinate
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Paragraph 0015; 0026, (2016/10/10)
The invention discloses a method for synthesizing monomenthyl succinate. DMAP serves as a catalyst. The method includes the steps that 10g of menthol, 7.68-11.52g of succinic anhydride, 0.8-1.5g of DMAP and 30 ml of chloroform are added into a three-mouth flask, magnetic stirring is carried out, the materials are heated to 50-60 DEG C through oil bath, backflow drying is carried out, and a reaction is carried out for 16-22 hours; after the reaction, precipitate is removed through suction filtration, washing is carried out through chloroform, ethyl acetate is added into obtained filtered liquid for dilution, and washing is carried out through a sodium carbonate solution; layering is carried out, an upper layer aqueous solution is obtained, diluted hydrochloric acid is added so that the upper layer aqueous solution can be acidized till pH is 0.8-1.2, extraction is carried out twice through ethyl acetate, and then extracted liquid is quickly dried through anhydrous magnesium sulfate; the extracted liquid is concentrated, light yellow liquid is obtained and placed at normal temperature till the light yellow liquid is solidified into white solid, the solid is ground into powder and dried at 40 DEG C in a vacuum decompression mode, and monomenthyl succinate is obtained. The method can increase the synthesis yield, reduce use cost, reduce corrosion to equipment and achieve environmental protection.
