The invention discloses a halogen-free flame-retardant prepolymer The halogen-free flame-retardant prepolymer is prepared through the following methods: heating a phosphorous compound, bismaleimide and an allyl compound in a reaction flask according to a mass ratio of m (phosphorous compound) to m (bismaleimide) to m (allyl compound) to obtain the halogen-free flame-retardant prepolymer, wherein the mass ratio of m (phosphorous compound) to m (bismaleimide) to m (allyl compound) is (1-20):(50-80):(15-50), the total mass of the phosphorous compound, the bismaleimide and the allyl compound is 100 parts, and a structural formula of the phosphorous compound contains a phosphaphenanthrene structure and at least one carboxyl group A prepreg and a laminated board made from the halogen-free flame-retardant prepolymer have integrated functions of excellent flame retardancy, dielectric property, mechanical property, high heat resistance and Tg, meet requirements on the development of a high-performance printed circuit board material, and can be applied to the fields of integrated circuit packaging, high-frequency high-speed and high-density interconnection and the like

Halogen-free flame-retardant prepolymer and prepreg and laminated board made from same

The invention discloses a preparation method of a polyaniline/polypropylene composite material. The method is characterized by comprising the following steps: dispersing and dissolving ammonium persulfate into water, to obtain an ammonium sulfate solution; adding aniline to the ammonium sulfate solution and stirring for reaction for 6-12 hours, thus obtaining a polyaniline solution after reaction is ended; carrying out suction filtration on the polyaniline solution, then adding stearic acid which is dissolved by a mixed solution of absolute ethyl alcohol and carbon tetrachloride to the polyaniline solution to perform doping treatment; carrying out suction filtration on the polyaniline subjected to doping treatment; drying and grinding into polyaniline powder like flour; and evenly mixing polyaniline with polypropylene, and plasticizing into the polyaniline/polypropylene composite material by virtue of an open rubber mixing mill, wherein the mass percent of polyaniline in the polyaniline/polypropylene composite material is 2-10%. The performances of the polyaniline/polypropylene composite material accord with the use requirements under different conditions, and the polyaniline/polypropylene composite material has the advantages of simple process and high product polymerization degree.

Preparation method of polyaniline/polypropylene composite material

The invention relates to a synthetic method of a flame retardant DOPO-ITA. The synthetic method comprises the steps that raw material DOPO and itaconic acid with an equimolar ratio are added to an ether solvent under the condition of inert gas nitrogen or argon atmosphere protection, heated to 150-180 DEG C in a pressurizing heating mode, stirred and reacted for 4-8 hours and subjected to coolingand crystallization to obtain the flame retardant DOPO-ITA, and the reaction conversion rate can be up to 98% and above. The synthetic method has the following characteristics of high reaction conversion rate, high product purity, small environmental pollution, low pressure reaction, simple and practicable production control, and being suitable for large-scale production.

Synthetic method of flame retardant DOPO-ITA

The invention provides a preparation method of a haloid acid secondarily-doped polyaniline film. The method comprises the following steps: (1) dispersing dodecylbenzene sulfonic acid into a mixed solvent of deionized water and ethanol, then adding aniline, and uniformly mixing to obtain a mixed solution A; (2) taking the mixed solution A prepared in the step (1) as a deposition solution, adoptinga constant-voltage electrochemical deposition method, taking ITO as a working electrode, taking a platinum sheet as a counter electrode and taking silver/silver chloride as a reference electrode, andcarrying out deposition at the voltage of 018-1.2V for 60-180 seconds so as to obtain the ITO of which the surface is deposited with the polyaniline film doped with dodecylbenzene sulfonic acid; and (3) soaking the ITO with the film deposited on the surface obtained in the step (2) in a weak base solution, washing the ITO, soaking the washed ITO in a halogen acid solution, soaking the ITO in deionized water, taking out and drying. The obtained film is used as a hole transport layer and is better matched with the valence band energy level of a perovskite film, the band order difference is reduced, the built-in electric field intensity is increased, the open-circuit voltage can be further increased on the basis that interface charge recombination is reduced, and the battery efficiency is improved.

Haloid acid secondarily-doped polyaniline film and preparation method and application of haloid acid secondarily-doped polyaniline film

The invention discloses a flexible sensor and a preparation method thereof. The flexible sensor is featured in that the protonic acid doping peak in the infrared Fourier spectra of a protonic-acid-doped polyaniline sheet is 1240cm , two ends of the protonic-acid-doped polyaniline sheet are provided with electrodes, and the protonic-acid-doped polyaniline sheet is coated with a flexible insulating material. The method comprises steps of firstly uniformly mixing aniline and protonic acid to obtain a transparent solution, placing an anode and a graphite cathode in the transparent mixed solution for electrodeposition to obtain protonic-acid-doped polyaniline coating on the anode, then dying the protonic-acid-doped polyaniline, arranging electrodes at two ends of the protonic-acid-doped polyaniline to obtain electrode-contained protonic-acid-doped polyaniline coating on the anode, separating the electrode-contained protonic-acid-doped polyaniline from the anode, coating the flexible insulating material on the surface of the protonic-acid-doped polyaniline provided with the electrodes at two ends, and dying the coated protonic-acid-doped polyaniline to obtain a target product. The flexible sensor has a high resistance change rate in stretching, can be widely used in working conditions of folding, distorting, stretching and the like, and is particularly suitable for the field of wearable equipment.

Flexible sensor and preparation method thereof

The invention discloses a synthetic method of dodecylbenzene sulfonic acid doped polyaniline and an application thereof in vanadium cell plate and relates to a synthetic method of aniline and an application thereof Dodecylbenzene sulfonic acid serves as a doping acid to synthesize polyaniline in a doping state, and conductive plastics are prepared by filling, wherein polyethylene-acrylic copolymer serves as a matrix, ethylene-vinyl acetate (EVA) copolymer serves as a plasticizer, and polyaniline in the doping state and carbon black serve as conductive fillers Meanwhile, the electric conductivity of the doped polyaniline and conductive plastics is tested by using a four-probe method, and the mechanical property and strong acid corrosion resistance of the conductive plastics are tested Compared with a material prepared by singly using polyaniline as conductive filler, the material prepared by taking a mixture of the polyaniline and the carbon black as conductive filler has higher conductivity and mechanical property The conductive plastics with the advantages of higher conductivity, mechanical property and acid resistance are prepared by using a press vulcanizer, and the polyaniline is applied to an electrode material of a vanadium cell

Synthesis of dodecylbenzene sulfonic acid doped polyaniline and application thereof in vanadium cell plate

The invention discloses a preparation method of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based halogen-free flame retardant polybutylece terephthalate (PBT) resin, and relates to a preparation method of a flame retardant PBT/DOPO blend. The preparation method comprises the steps of firstly, synthesizing DDPO, namely adding the DOPO and dimethylbenzene in a four-neck flask provided with a mechanical stirrer, a condenser, a thermometer and a nitrogen conduct; under a circumstance of nitrogen protection, raising temperature and dissolving itaconic acid through dioxane, and raising temperature and implementing a reflux reaction, filtering, recrystallizing through tetrahydrofuran and drying for 8 hours; and then, preparing the PBT/DOPO blend, namely completely mixing the PBT and the DDPO according to proportions, melting and blending in a co-rotating twin-screw extruder, extruding and pelleting. According to the method disclosed by the invention, the 9,10-dihydro-10-(2,3-dicarboxyl)propyl-10-phosphaphenanthrene-10-oxide (DOPO) is synthesized, and an optimal synthesis condition is determined; the method is simple and easy to implement, high in yield and easy to realize industrial production.

Preparation method of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based halogen-free flame retardant polybutylece terephthalate (PBT) resin

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Synthesis of dodecylbenzene sulfonic acid doped polyaniline and application thereof in vanadium cell plate

Preparation method of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based halogen-free flame retardant polybutylece terephthalate (PBT) resin