3results about How to "Good response controllability" patented technology

The invention relates to the field of macromolecules, in particular to a polyamide elastomer raw material composition and application thereof, polyamide elastomer and a preparation method thereof. The raw material composition contains polyamide and polyether, wherein at least one end-capping group in the polyamide is an amino-terminated group; at least one end-capping group in the polyether is an ester group. When the raw material composition is used for preparing the polyamide elastomer, the advantages of high reaction speed, high production efficiency and the like are achieved, the reaction controllability is high, the molecular weight of the product is large, and the type, molecular weight and structure of the soft segment can be adjusted according to application requirements, so that the performance of the elastomer is effectively regulated and controlled.

The invention relates to a preparation method and application of 6-methyl-3, 5-dioxocapryloyl coenzyme A. According to the preparation method, 2-methylbutyric acid serves as a starting raw material, the 6-methyl-3, 5-dioxocapryloyl coenzyme A is chemically synthesized through the steps of activation, condensation, coenzyme A coupling and the like, and the structure and purity of the 6-methyl-3, 5-dioxocapryloyl coenzyme A are identified through the technologies of LC-MS / MS, 1HNMR and the like. The nine-carbon coenzyme A is successfully prepared and identified through a chemical synthesis method for the first time, the core problem that an intermediate is unstable and cannot be obtained in vitro is solved, and a stable substrate is provided for in-vitro acyl transfer; the QS-21 in-vitro acyl transfer reaction is realized for the first time, an in-vitro catalytic system of a chemical synthesis intermediate and an insect cell expression enzyme is established, and a foundation is laid for development of a QS-21 total synthesis process.

The invention discloses end-group carbon functionalized polysiloxane and a preparation method thereof, and belongs to the technical field of organic silicon industry. The preparation method of the carbon-terminated functionalized polysiloxane comprises the following steps: (1) mixing hydroxyl-terminated polysiloxane, chlorosilane and an acid-binding agent, and stirring and reacting under the protection of nitrogen to obtain a reaction solution a; (2) adding an organic solvent into the reaction liquid a, uniformly stirring, adding alkali liquor, and stirring to react until a system is neutral, so as to obtain reaction liquid b; (3) adding a drying agent into the reaction solution b, stirring, drying and filtering to obtain a reaction solution c; and (4) carrying out reduced pressure distillation on the reaction liquid c, and recovering the solvent to obtain the carbon-terminated functionalized polysiloxane. The carbon-terminated polysiloxane is prepared through the reaction of chlorosilane and hydroxyl-terminated polysiloxane, the preparation method is simple, the reaction is economical and efficient, the completely-terminated carbon-terminated polysiloxane can be prepared on a large scale, meanwhile, no waste gas or waste water is generated, and the method is safe and environmentally friendly.