4 results about "2,2,2-Trifluoroethanol" patented technology

A Ramjet solid fuel comprising up to 50% metal by weight selected from the group consisting of aluminum, boron, boron carbide, magnesium, titanium, and titanium boride; between 2.0 and 9.0 weight percent fluorinated combustion aids selected from the group consisting of 3-hydroxybenzo trifluoride (3HBTF), hydroxyfluoro-2-propanol (HF2P), polytetrafluoroethylene, and trifluoroethanol (TFE); and up to 48% by weight of the remaining component being a hydroxyl terminated, epoxidized polybutadiene polymer (Poly BD 605E) (HO—CH2-CH═CH—CH2-CH2-CH—O—CH—CH2-CH2-CH—(CH═CH2)-CH2-CH═CH—CH2-CH2-CH—O—CH—CH2-OH).

The application belongs to the technical field of material engineering, and discloses a PMMA film with controllable and reversible transparency and shape, a preparation method and application. The preparation method comprises the following steps: modifying PMMA by carboxylation to obtain carboxylated PMMA; dissolving the carboxylated PMMA in trifluoroethanol, stirring until completely dissolved after 12-24 hours to obtain a carboxylated PMMA solution; and pouring the carboxylated PMMA solution on a polyimide film, and standing until the trifluoroethanol solution is completely volatilized to obtain a PMMA film. The preparation method is simple and suitable for industrialization. The obtained PMMA film has controllable and reversible transparency and shape, and can be used to prepare a PMMA material with controllable and reversible transparency and shape at low cost.

The application belongs to the technical field of intelligent nanometer materials, and relates to a shape memory micro-topological structure nanometer fiber membrane as well as a preparation method and application thereof. The preparation method is as follows: a fiber membrane is prepared through electrostatic spinning with trifluoroethanol as a solvent; after the fiber membrane is stretched and fixed, in-situ polymerization is carried out in a tris-hydroxymethyl aminomethane buffer to obtain a left-handed polylactic acid / polyhydroxybutyrate valerate@polydopamine fiber membrane; and the surface micro-topological structure is regulated by controlling the temperature to make the fiber retract. The nanometer fiber membrane prepared by the application has both shape memory performance and a regulatable surface micro-topological structure, and the process is simple and the cost is controllable, so the application is suitable for the fields of biomedicine, intelligent materials and the like.

The application provides an application of a strain of Tolypocladium inflatum ZJPH2105 in preparing a chiral aromatic alcohol through asymmetric reduction of an aromatic ketone. The product obtained through catalysis of the strain of Tolypocladium inflatum ZJPH2105 has an e.e. value of greater than 99.9%, the strain is green and safe, easy to cultivate, and rich in source, and the conversion process does not need to add expensive coenzyme, and has the characteristics of low cost, green and environment-friendly conversion process and the like. The application uses the strain of Tolypocladium inflatum ZJPH2105 as a biological catalyst to reduce 4'-bromo-2,2,2-trifluoroacetophenone, when the substrate concentration is 10 mM, the yield of the target product (S)-1-(4-bromophenyl)-2,2,2-trifluoroethanol can reach 98.2%, and the e.e. value is greater than 99.9%.