51results about How to "The polymerization reaction conditions are mild and controllable" patented technology

The invention discloses polyimide with triazole rings in a main chain structure, i.e. polytriazoles imide resin and a preparation method thereof. The method comprises the following steps: firstly, designing and synthesizing binary azides; then, using binary anhydride and m-phenylacetylene as raw materials for designing and synthesizing terminal alkynyl imide compounds; and thirdly, using the terminal alkynyl imide compounds and azides with equimolar amounts to take 1, 3-Dipolar cycloaddition polymerization reaction in a solvent or adopting thermal polymerization reaction, or adopting redox catalysed polymerization for synthesizing novel polytriazoles imide. The polytriazoles imide resin prepared by the method of the invention has good processing performance, has high thermal stability, simultaneously has good mechanical property and electric performance, and embodies the characteristics of high corrosion resistance performance, high binding power and the like of the polytriazoles imide resin. The invention has wide application prospects in the fields of aviation, astronavigation, micro-electronics, automobiles, shipping industries and the like.

The invention relates to a method for preparing vinylidene fluoride / N, N-dimethylacrylamide copolymers in a green manner. The vinylidene fluoride / N, N-dimethylacrylamide copolymers are used as separation membrane materials. The method has the advantages that the method is a copolymer synthesis technology based on water / oil two-phase interfacial free radical polymerization, oxidation-reduction reaction is carried out by special Gemini surface active initiators and potassium persulfate at the normal temperature, free radicals are repeatedly generated on interfaces, independent polymerization reaction between vinylidene fluoride and N, N-dimethylacrylamide is initiated, two types of chain segments are connected with each other by initiator molecules in series to form the segmented copolymers, the feed ratios of monomers are extremely consistent with component ratios of the copolymers when pH (potential of hydrogen) values of water-phase media are within the ranges of 4.0-4.5 as proved by experiments, the content of N, N-dimethylacrylamide chain segments in the copolymers is adjustable in the ranges of 5-25 wt.%, polymerization reaction conditions in the modes are mild and controllable, the method is low in energy consumption, other organic solvents or emulsifiers can be omitted, products are pure, and requirements on green chemistry can be completely met.

The invention relates to a sodium isooctylhydrazide sulfonate initiator and its preparation and use method. Synthesize a compound containing bis-sulfonate anion and isooctylhydrazide group, which has the characteristics of surfactant. At the same time, hydrazide can undergo redox reaction with potassium persulfate at room temperature, and can repeatedly generate free radicals, which can be flexibly controlled Multi-phase serial polymerization, styrene and methyl methacrylate and styrene and hydroxyethyl acrylate are sequentially initiated on the water / oil interface to obtain multi-block copolymers. The composition ratio is very consistent, indicating that the initiator has a high initiation efficiency. The polymerization reaction conditions of this mode are mild and controllable, the energy consumption is low, and other organic solvents and emulsifiers are not used. The product is pure and fully meets the requirements of green chemistry.

The present invention relates to a polyhydroxy tribasic hydrazide initiator and a preparation and use method thereof. Synthesis of an amphiphilic compound containing three hydrazide groups, the compound has the characteristics of positioning at the water / oil two-phase interface, and the hydrazide in the hydrophilic part can undergo redox reaction with potassium persulfate at room temperature, The free radicals can be repeatedly generated for many times, so as to flexibly control the multiphase tandem polymerization mode, and sequentially initiate the polymerization of styrene and vinyl acetate and styrene and N-vinylpyrrolidone at the water / oil interface to obtain multi-block Copolymer, the experiment proves that the ratio of the monomer to the material is very consistent with the composition ratio of the copolymer, indicating that the initiator has a high initiation efficiency. The polymerization reaction conditions of this mode are mild and controllable, low energy consumption, and no other organic solvents and emulsifiers are needed. , the product is pure and fully meets the requirements of green chemistry.