209 results about "Dithiol" patented technology

The invention relates to an automobile paint surface protective film agent and a preparation method thereof, and belongs to the technical field of automobile beauty. The automobile paint surface protective film agent is prepared from the following raw materials: amino functional polysiloxane, fluorine modified acrylic resin, epoxy modified organic silicon emulsion, functional filler, a surfactant, hydrophobic modified silicone oil, a brightening agent, a penetrating agent, a cosolvent and deionized water, and the raw materials are blended to prepare the automobile paint surface protective film agent. The functional filler is prepared by firstly carrying out surface modification on a polymer and then carrying out click chemistry on dodecanethiol on hydroxylated nano silicon dioxide, and the polymer is prepared by carrying out nucleophilic addition on poly (ethylene glycol) methacrylate Mn360, poly (ethylene glycol) methacrylate Mn500 and isophorone diisocyanate. The automobile paint surface protective film agent is high in film forming speed, a formed film layer has the characteristic of multiple effects, and meanwhile, the wear resistance is also very good.

The invention discloses a medical washable high-temperature-resistant modified polyester fiber fabric and a preparation method thereof, and relates to the technical field of fabrics. The medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention is obtained by blending, spinning and weaving modified polyester and modified mica and activating with sodium hypochlorite; the modified polyester is obtained by grafting organic silicon modified polyester with n-dodecanethiol and then reacting with bromooctylhydantoin; the modified mica is prepared by polymerizing diethyl phosphite and bisphenol S on the surface of the pretreated mica, grafting a vinyl monomer and then reducing; the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt, and the vinyl monomer is obtained by carrying out a reaction on 1-allyl-3-cyano-6-hydroxy-4-methyl-2-pyridone and an azo salt; the medical washable high-temperature-resistant modified polyester fiber fabric prepared by the invention has good antibacterial, anti-aging and flame-retardant properties.

The invention discloses a preparation method of a large-area and distance-adjustable gold nanoparticle single-layer superlattice film and a product and application thereof, and belongs to the technical field of nanomaterials, the method comprises the following steps: modifying the surfaces of gold nanoparticles by using sulfydryl polystyrene and 1, 8-octyldithiol to obtain double-ligand co-modified gold nanoparticles; an interface assembly strategy is adopted to enable the double-ligand co-modified gold nanoparticles to form a film at the interface of toluene and diethylene glycol, and after toluene volatilizes, the large-area gold nano single-layer superlattice film with the adjustable distance is obtained. According to the method disclosed by the invention, by accurately regulating and controlling double-ligand modification on the surfaces of the gold nanoparticles and optimizing interaction among the particles in the assembly process, accurate regulation and control of the particle spacing of the gold nanoparticle single-layer superlattice film from 1nm to 8nm are realized. The electromagnetic field intensity can be obviously enhanced by accurately regulating and controlling the particle gaps to the sub-nanometer scale, so that the material becomes an ideal SERS substrate, and possibility is provided for developing a metamaterial with a high optical index.

The invention discloses a leukemia targeted therapy preparation as well as a preparation method and application thereof. Comprising a DNA nanoflower carrier targeting leukemia cells through a PTK7 receptor and benzene arsenic oxide loaded on the carrier. The DNA nanoflower carrier is obtained by rolling circle amplification, and a nucleic acid aptamer complementary sequence of targeted binding leukemia cells is introduced into a template chain subjected to rolling circle amplification. The preparation method comprises the following steps: modifying sulfydryl onto a DNA nanoflower by using DNA-Dithiol, then breaking a disulfide bond by using reduced glutathione to expose the sulfydryl, and loading benzene arsenic oxide onto the DNA nanoflower through a reaction between trivalent arsenic and the sulfydryl. The structure of the DNA nanoflower has a high surface area and high porosity, and can load a large amount of PAO, so that the killing performance on cancer cells is enhanced; the aptamer sgc8 sequence is introduced into the DNA nanoflower, so that the targeting of the DNA nanoflower to cancer cells is effectively realized; the preparation also has the advantages of being good in thermodynamic stability, easy to store, excellent in biocompatibility and the like, and has a very good application prospect.

The invention discloses desulfurized rubber modified asphalt and a preparation method thereof, and the desulfurized rubber modified asphalt comprises the following components in parts by mass: 100 parts of petroleum asphalt, 25-35 parts of desulfurized rubber powder, 0.2-2 parts of oxime sulfonate modifier, and 0.5-3 parts of modified artificial zeolite. Wherein the desulfurized rubber powder is prepared from the following raw materials: waste rubber powder, calcium nitrate, aniline, 2, 5-benzothiazole dithiol, p-methylphenyl magnesium bromide, diphenyl sulfoxide and trimethylchlorosilane in a mass ratio of (80-100): (10-20): (20-30): (5-10): (5-6): 1: (3-4); the invention further discloses a specific preparation method of the desulfurized rubber powder. The asphalt provided by the invention has the advantages of simple components, improved performances, low mixing temperature and more convenient use.

The invention discloses an anti-ultraviolet automobile window film and a preparation method thereof, and relates to the field of high polymer materials. When the anti-ultraviolet automobile window film is prepared, methylcyclotetrasiloxane, octamethylcyclotetrasiloxane, 3-glycidyl propyl (dimethoxy) methylsilane and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane are subjected to a reaction, and modified polysiloxane is prepared; the preparation method comprises the following steps: reacting benzo [1, 2-d: 5, 4-d '] bis (oxazole)-2, 6-dithiol with 4-aminobenzoyl chloride to prepare a modified ultraviolet absorbent; isophorone diisocyanate, polytetrahydrofuran ether glycol, the modified polypyrrole particles, the modified polysiloxane and the modified ultraviolet absorbent are subjected to a reaction, and the reaction product is spread in a mold. The anti-ultraviolet automobile window film prepared by the invention has good anti-ultraviolet, heat-insulating, flame-retardant and anti-aging properties and good mechanical properties.

The invention discloses a preparation method of a waterborne polyurethane dispersion with excellent corrosion resistance, which comprises the following steps: (1) firstly carrying out vacuum dehydration on polyol, a micromolecular polyhydroxy chain extender and a hydrophilic chain extender, and then adding polyisocyanate to carry out polymerization reaction; the preparation method comprises the following steps: firstly, adding an alkynyl silane coupling agent into a reaction kettle, then adding micromolecular diol, diol containing an alkynyl side chain and a micromolecular diamine chain extender, carrying out a chain extension reaction, and finally, adding a monoamino silane coupling agent, and carrying out an end capping reaction, so as to prepare a polyurethane polymer; (2) dispersing the polyurethane polymer solution into water to obtain a polymer emulsion; and (3) adding a dithiol compound and an initiator into the polymer emulsion, so that an alkyne group on a polymer side chain and a sulfydryl of thiol are subjected to a click coupling reaction, and the waterborne polyurethane dispersion with the side chain containing free sulfydryl is obtained. According to the invention, the micromolecular mercaptan corrosion inhibitor is grafted to a side chain of a waterborne polyurethane molecule, and the obtained waterborne polyurethane has significantly improved corrosion resistance.

The invention discloses high-toughness recoverable bio-based polyurethane and a preparation method thereof. The preparation method comprises the following steps: dissolving dithiol, methacrylic acid-2-(tert-butylamino) ethyl ester and a photoinitiator in a good solvent according to a certain molar ratio to prepare a precursor 1 containing di-tert-butylamino; the preparation method comprises the following steps: dissolving 2, 5-furandimethanol, oligomer polyol, a precursor 1, diisocyanate and a catalyst in a good solvent according to a certain molar ratio to prepare a linear polymer; the linear polymer and the maleimide modified cellulose are dissolved in a good solvent according to a certain mass ratio and then poured into a mold, and the high-toughness recoverable bio-based polyurethane is prepared after the solvent is volatilized. The bio-based polyurethane disclosed by the invention contains double dynamic covalent bonds and multiple dynamic non-covalent bonds, and the advantages of high toughness and recoverability of the bio-based polyurethane are realized through dynamic covalent-non-covalent interaction.

The invention discloses a low-temperature-resistant advertising material and a preparation method thereof, and relates to the technical field of advertising materials, the low-temperature advertising material comprises an aluminum foil layer, a special bonding coating and a bottom layer from top to bottom; the special bonding coating comprises the following raw materials in percentage by mass: 20-40% of waterborne acrylic resin, 5-15% of a modified graphene / polyurethane composite material, 2-6% of a toughening agent, 4-6% of a flatting agent, 1-3% of a defoaming agent, 1-5% of an anti-aging agent and 31-61% of distilled water; the modified graphene / polyurethane composite material is prepared from the following raw materials in parts by weight: 55 to 65 parts of ethylenediamine-terminated waterborne polyurethane, 10 to 14 parts of carbamic acid esterified graphene oxide, 2 to 3 parts of dithiol and 60 to 86 parts of deionized water. The advertising material provided by the invention has relatively strong flame-retardant and low-temperature-resistant characteristics.

The invention provides a room-temperature hydrogen sensor as well as a preparation method and application thereof, and belongs to the technical field of hydrogen sensors. According to the invention, sulfur-metal chemical bond combination between a thiol end group of a dithiol organic molecule and metal is utilized, a layer of porous thiol self-assembled monomolecular layer film is constructed between a palladium hydrogen sensitive layer and a first electrode of a substrate, and the palladium sensitive layer is suspended on the self-assembled monomolecular layer, so that the palladium sensitive layer is fully exposed in a hydrogen atmosphere; the adsorption / desorption dynamic performance of the palladium membrane in the hydrogen response process is greatly improved, so that the response speed of the sensitivity of the sensor is remarkably improved. Besides, the carbon chain structure of the self-assembled monomolecular layer has excellent mechanical toughness and lubricity, interface stress generated in the hydrogen absorption expansion process of the palladium sensitive layer can be effectively relieved, the stability of the sensor is greatly improved, and the service life of the sensor is greatly prolonged. The sensor prepared by the invention can detect low-concentration (1ppm) hydrogen at room temperature, and can stably work for more than 10 years.

The invention discloses an all-inorganic perovskite nanocrystalline composite material and a preparation method and application thereof, and belongs to the technical field of luminescent materials. The preparation method comprises the following steps: mixing lead bromide and octadecene, carrying out first heat treatment, adding oleic acid and oleylamine, and carrying out second heat treatment to obtain a lead bromide precursor solution; mixing and reacting the lead bromide precursor solution with the cesium oleate solution, and cooling to obtain an all-inorganic perovskite nanocrystalline mixed solution; and mixing the full-inorganic perovskite nanocrystalline mixed solution with zinc stearate and dodecanethiol for reaction, centrifuging, and removing the solvent to obtain the full-inorganic perovskite nanocrystal. The preparation method is easy to operate, high in reproducibility, clean, free of pollution and suitable for large-scale production, the effective component of the prepared all-inorganic perovskite nanocrystalline composite material is a heterojunction structure composite material attached with zinc sulfide microspheres, the stability is good, the photoluminescence intensity is high, the sensitivity to pressure is high, and the application prospect is wide. Meanwhile, excellent sensitivity is also realized under low pressure.

The invention discloses a dynamic covalent bond cross-linked I-PDMS / DEA (at) alpha-ZrP-SH self-repairing anti-friction super-hydrophobic anti-corrosion coating as well as a preparation method and a coating thereof, relates to the technical field of anti-corrosion coatings, and aims to solve the problems that the super-hydrophobic performance of an existing super-hydrophobic anti-corrosion coating is reduced, the anti-corrosion efficiency is low and the service life is long due to mechanical friction and a severe working environment. Or when the coating is impacted, the coating is damaged, so that the corrosion resistance is invalid. Comprising the following steps: (1) preparing an alpha-ZrP nanosheet by taking zirconium oxychloride octahydrate and a phosphoric acid solution as raw materials; slowly adding diethanol amine into the alpha-ZrP suspension, so that diethanol amine (DEA) is intercalated into the alpha-ZrP, and DEA (at) alpha-ZrP is prepared; (2) adding n-dodecanethiol into the DEA (at) alpha-ZrP suspension liquid, and standing to enable the n-dodecanethiol to be grafted to the surface of the DEA (at) alpha-ZrP, so as to obtain a DEA (at) alpha-ZrP-SH nanosheet; and (3) diluting PDMS as a coating substrate, adding BTC, mixing to obtain an I-PDMS diluent, adding the DEA-alpha-ZrP-SH nanosheets, uniformly dispersing, and adding a curing agent to obtain the self-cleaning heat-conducting anticorrosive paint disclosed by the invention.

The invention discloses a high-refractive-index photo-thermal dual-curing optical adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials, and the preparation method comprises the following steps: S1, preparation of high-refractive-index resin: placing biphenyl-4, 4 '-dithiol in a nitrogen atmosphere reaction kettle, adding a free radical thermal initiator, heating to 180-200 DEG C, reacting for 1-2 hours, and cooling to room temperature to obtain the high-refractive-index resin; dropwise adding alkenyl resin under the protection of nitrogen, stirring, reacting for 1-2 hours after dropwise adding, and cooling to room temperature to obtain high-refractive-index resin; s2, preparation of the optical adhesive: mixing the alicyclic epoxy resin, the high-refractive-index resin, the toughened resin, the liquid epoxy resin, the cationic photoinitiator and the cationic thermal initiator, and uniformly stirring in a dark place to obtain the adhesive. The problems that a traditional optical adhesive is poor in optical performance stability and unbalanced in mechanical and optical performance are solved. The application potential of preparing the high-performance optical adhesive is realized.

The invention discloses a high-toughness self-repairing plastic runway adhesive based on double-sulfur dynamic crosslinking, which is characterized by comprising the following components in percentage by weight: 57-70% of polyhydric alcohol composition, 5-10% of dithiol, 5-10% of dithiol, 5-10% of dithiol, 5-10% of dithiol, 5-10% 25 to 35% of diisocyanate; 3-8% of a chain extender containing dynamic disulfide bonds; 1-3% of in-situ modified nano cerium dioxide; 0.05 to 0.13 percent of a composite catalyst; 0.3 to 0.7% of a hydrolysis resistant agent; 2.0 to 6.0 percent of flame retardant; 0.2%-0.5% of an antioxidant; wherein the ratio of the total mole number of isocyanate groups in the diisocyanate to the total mole number of hydroxyl groups in the polyol composition and the chain extender containing the dynamic disulfide bonds, namely the mole ratio of NCO to OH is (2.2-3.5): 1. The invention also discloses a preparation method of the composition. According to the invention, by introducing a dynamic disulfide bond (HEDS) and a specific composite catalyst, after a cured adhesive layer generates microcracks, a molecular network of the cured adhesive layer can realize self-repairing through reversible exchange of the disulfide bond, the mechanical property is remarkably recovered, and the service life of a runway is greatly prolonged.

The invention discloses an acid and alkali resistant nanofiltration membrane and a preparation method thereof, and relates to the technical field of nanofiltration membranes. The nanofiltration membrane with better acid resistance and alkali resistance is prepared by combining a surfactant, click chemistry reaction and a metal organic framework; zirconium chloride is used as a metal node, 2-amino p-benzoic acid is used as an organic ligand, a Zr-MOF metal organic framework is constructed by adopting a solvothermal method, sulfydryl is introduced, pentaerythritol triacrylate and octyldithiol in a grafting solution are combined, free radical polymerization is carried out under UV illumination, and a high-crosslinking-degree network is formed; the charge repulsive effect of the sulphobetaine monomer realizes efficient screening of ions or molecules; a gradient ultraviolet polymerization process is adopted, and the ultraviolet intensity and density are dynamically adjusted, so that the surface flatness of the nanofiltration membrane and the uniformity of pore size distribution are improved; through chemical component design and process optimization, the mechanical property and chemical property stability of the nanofiltration membrane are synergistically improved.

This invention discloses a high-transmittance insulating ink for back-contact batteries and its preparation method, belonging to the technical field of insulating inks. The insulating ink comprises the following components by mass percentage: 60%~64% base resin, 1%~2% thiol, 2%~4% tackifier, and 25%~30% diluent; wherein the base resin is a hydroxyl-terminated polyester-modified acrylate, the thiol is ethylene dithiol, the tackifier is at least one of terpene resin, C5 petroleum resin, and C9 petroleum resin, and the diluent is at least one of 1,4-butanediol diacrylate, pentaerythritol triacrylate, and dipropylene glycol diacrylate. This invention utilizes the reaction of the dithiol's dithiol group with the hydroxyl groups (-OH) or double bonds in the hydroxyl-terminated polyester-modified acrylate to form thioether bonds (-S-) or thioester bonds, constructing a three-dimensional cross-linked network, thereby significantly improving the hardness and transmittance of the cured resin system. The reasonable combination of tackifier and diluent allows the ink to achieve high adhesion while maintaining hardness.

This invention discloses a composite nanozyme that enhances the clinical efficacy of oxaliplatin, its preparation method, and its application. The composite nanozyme consists of indium ruthenium nanozyme and an iliximab embedding and anchoring layer. The indium ruthenium nanozyme consists of indium ruthenium nanoparticles and a carbon-nitrogen framework, with the indium ruthenium nanoparticles loaded on the surface and within the pores of the carbon-nitrogen framework. The iliximab embedding and anchoring layer consists of a dithiol polyethylene glycol coating layer and iliximab. Preparation method: ZIF-8 is prepared by co-precipitation of zinc salt methanol solution and 2-methylimidazole methanol solution, followed by calcination to obtain the carbon-nitrogen framework. The carbon-nitrogen framework dispersion is then stirred in an oil bath with indium nitrate solution and ruthenium trichloride solution to prepare a nanozyme precursor, followed by calcination to obtain indium ruthenium nanozyme. The indium ruthenium nanozyme is dispersed in a dithiol polyethylene glycol solution, and iliximab solution is added dropwise. The resulting solid product is then dried. This invention can solve problems such as strong drug tolerance, insufficient intracellular accumulation, and severe tumor immunosuppression in oxaliplatin treatment.

The invention discloses a hot-melt type renewable phenolic resin and a preparation method thereof, and a hot-melt type renewable phenolic resin-based ablation-resistant composite material and a preparation method and a regeneration method thereof. The preparation method comprises the following steps: carrying out a melting reaction on a polyhydroxymethyl phenol compound and a dithiol compound to prepare the hot-melt type renewable phenolic resin; the preparation method comprises the following steps: heating hot-melt renewable phenolic resin so as to form a resin adhesive film through curtain coating, laminating the resin adhesive film and a fiber reinforcement body, passing through a roller, rolling to obtain a molten phenolic resin prepreg, and carrying out hot-press molding on the hot-melt phenolic resin prepreg to obtain the hot-melt renewable phenolic resin-based ablation-resistant composite material. The catalyst can be regenerated through an aprotic polar solvent dissolution-precipitation process. The prepared hot-melt renewable phenolic resin has the advantages of efficient repair, wide and adjustable viscosity range, high thermal decomposition temperature and high char yield, and endows the hot-melt renewable phenolic resin-based ablation-resistant composite material with reproducibility, self-repair property, ablation resistance and good mechanical properties.

The application discloses a kind of hydrophilic polyvinylidene fluoride oil-water separation membranes and preparation method thereof, belong to oil-water separation membrane technical field.The preparation method steps include: with 2,2-dimethoxy-2-phenyl acetophenone as photo initiator, 3,6-dioxane-1,8-octane dithiol and polyethylene glycol diacrylate as modifier, by photo initiation mercapto-olefin gradually polymerization method is modified to alkali treated PVDF membrane, and hydrophilic polyvinylidene fluoride oil-water separation membrane is prepared.The application is grafted to PVDF separation membrane surface by photo initiation mercapto-olefin gradually polymerization method, and hydrophilic separation membrane is obtained.The preparation method provided by the application has the characteristics of simple process, low cost and the like, and the prepared hydrophilic membrane can be further developed and utilized as sewage treatment separation membrane, hemodialysis membrane.

The application provides a dithiol modified copolymer and a preparation method and application thereof, and particularly relates to the technical field of lithium batteries. In the dithiol modified copolymer, the copolymer is a branched diene-vinyl pyridine copolymer, which is mainly obtained by copolymerization of branched diene and vinyl pyridine. The dithiol modified copolymer provided by the application has a main chain composed of flexible branched diene units, which endows the copolymer with a good elastic skeleton structure; vinyl pyridine is introduced as a functional monomer, so that a pyridine group is formed on the side chain of the copolymer; a dithiol compound introduces a thiol group (-SH) to the copolymer, and finally, the dithiol modified copolymer has a flexible main chain structure, and the side chain simultaneously contains a pyridine group and a thiol group, and has good elasticity and functional characteristics.

The invention relates to a bis (2, 2-methylene disulfide) episulfide compound with an ultrahigh refractive index and a preparation method thereof, and belongs to the technical field of optical materials, and the preparation method comprises the following preparation steps: taking chloroacetaldehyde dimethyl acetal, a solvent, disulfur dichloride and an acidifying agent, and carrying out a sulfuration substitution reaction to prepare 2-chloro-1, 2-dithiol; the preparation method comprises the following steps: carrying out nucleophilic substitution reaction on methoxycarbonyl sulfonyl chloride, a low-boiling-point solvent and 2-chloro-1, 2-ethanedithiol, and dropwise adding a bicarbonate saturated aqueous solution to carry out cyclization reaction so as to prepare a methoxycarbonyl disulfide-episulfide compound; and adding dimercaptomercaptan, and reacting to obtain a product. The process route provided by the invention solves the problems of tedious step-by-step reaction, more byproducts and high cost in the prior art.

The invention discloses a trithiothiotriazine trisodium salt corrosion inhibitor and its preparation method and application, and belongs to the technical field of corrosion inhibitor synthesis. The invention uses thiocyanuric acid as a raw material, and successfully grafts a carbon-carbon double bond to it by reacting with bromopropylene to generate an intermediate 2,4-dimercapto-6-mercaptopropenyl-1,3,5-triazine monomer, and then polymerizes it with allylthiourea, adds an initiator under nitrogen protection, and heats, stirs, purifies, and dries in a water bath to obtain a corrosion inhibitor; the corrosion inhibitor has excellent corrosion inhibition and bactericidal properties at the same time, can effectively solve the corrosion and microbial contamination problems in oil and gas field pipelines, still has excellent stability under high temperature environment, and meets the use requirements under extreme working conditions such as oil and gas fields.

The invention belongs to the field of polymer composite materials, and relates to a polyimide aerogel coating material as well as a preparation method and application thereof. The invention provides a preparation method of a polyimide solution, which comprises the following steps: efficiently and quickly carrying out a catalyst-free thiol-alkynyl click polymerization reaction on a dithiol monomer and a diyne monomer under mild conditions to construct a uniform polymer network and obtain a high-uniformity polyimide dilute solution; and then forming a three-dimensional porous aerogel structure through coating, solvent exchange and normal-pressure drying. The prepared aerogel coating material can be used as an aerogel composite coating, a fireproof heat insulation fabric, a heat preservation fireproof coating, a heat management interface material and the like to be applied to the fields of new energy, special protective clothing, building heat insulation and fire prevention, electromagnetic shielding and the like. According to the method, the production process is simplified, the application range of the polyimide aerogel coating in a multifunctional composite material is widened, and the continuous production process of the polyimide aerogel coating is promoted.

Various precursor solutions and methods of 3D printing and other additive manufacturing approaches are provided for the manufacture of articles using photocrosslinkable vinyl shape memory polymers. In various aspects, articles are manufactured by a process comprising (i) exposing a precursor solution to an intensity and frequency of light to initiate photo-polymerization of the precursor solution to form a layer of the article; and (ii) repeating step (i) a number of times to form the article in a layer-by-layer approach; wherein the precursor solution comprises a first polymeric precursor comprising a plurality of vinyl terminated side-chains attached thereto. A vinyl-functionalized, photocrosslinkable SMP used as an example herein is a novel variant of a previously disclosed SMP composition, with higher amounts of vinyl functionalization but similar thermomechanical properties to the SMP library previously disclosed. Moreover, a unique combination of chemistries is disclosed that incorporates the aforementioned vinyl-functionalized SMPs along with acrylate-based crosslinkers. Additional novel compositions are disclosed containing the vinyl-functionalized SMPs with additional dithiol functionalizations, vinyl-functionalized SMPs with dithiol crosslinkers, as well as vinyl-functionalized SMPs with both acrylate-based and dithiol crosslinkers, as another means to tune degradation rates and other material properties. The articles can include a variety of articles such as stents, grafts, external sheaths, and the like. Beneficially, the printed articles can include a plurality of pores having an average diameter of about 50 pm to about 5000 pm, about 500 pm to about 2000 pm, or about 1000 pm even in the absence of a photoblocker.

The invention discloses a one-step synthesis method of environment-friendly Ag2Te quantum dots. The one-step synthesis method comprises the following steps: providing a silver precursor and a tellurium precursor; the tellurium precursor is prepared by mixing tellurium dioxide and dodecanethiol; mixing oleylamine and octadecene, heating to a preset temperature, adding the silver precursor, rapidly injecting the tellurium precursor after a first reaction time, stopping heating after a second reaction time, and cooling to obtain a quantum dot crude solution; and purifying the quantum dot crude solution to obtain the required environment-friendly Ag2Te quantum dot. The size distribution and the exciton absorption peak of the environment-friendly Ag2Te quantum dots are related to the preset temperature. The invention further discloses the environment-friendly Ag2Te quantum dot obtained by the method and application thereof. The tellurium precursor and the silver precursor which do not contain phosphine are adopted, the synthesis process is simple and non-toxic, different size distribution and wide-range exciton absorption peaks of the Ag2Te quantum dots are achieved, and the monodispersity of the Ag2Te quantum dots can be guaranteed.

The invention discloses gemini quaternary ammonium salt type sulfur-containing polyester and a preparation method and application thereof.The preparation method comprises the steps that dimethylamino diacrylate and halogenated alkyl quaternary ammonium salt are subjected to a substitution reaction, and gemini quaternary ammonium salt type diacrylate is obtained; then, the gemini quaternary ammonium salt type diacrylate and alkyl dithiol are subjected to a sulfydryl-alkene click polymerization reaction, and the gemini quaternary ammonium salt type sulfur-containing polyester is obtained. According to the gemini quaternary ammonium salt type sulfur-containing polyester as well as the preparation method and the application thereof, the gemini quaternary ammonium salt type sulfur-containing polyester has excellent inhibition and killing activity on helicobacter pylori and has good blood compatibility and relatively low cytotoxicity.

The application discloses a high-toughness semi-interpenetrating network liquid crystal elastomer with low phase transition temperature and a preparation method and application thereof, and belongs to the technical field of liquid crystal elastomers and intelligent polymer materials. The preparation method comprises the following steps: after linear liquid crystal polyurethane, liquid crystal polymerizable monomers, dithiol, polythiol, a photoinitiator and a thermal catalyst are blended and dissolved, a precursor solution is obtained by mixing the linear liquid crystal polyurethane, a pre-crosslinked film is obtained through thermal crosslinking, and then a free radical polymerization reaction is carried out on the pre-crosslinked film under the condition of mechanical stretching and using ultraviolet light irradiation, so that the high-toughness semi-interpenetrating network liquid crystal elastomer with low phase transition temperature is obtained. According to the application, the semi-interpenetrating network is constructed, so that the flexible long chain of the polymer can effectively dissipate mechanical energy through slippage when being stressed, and the breaking toughness of the material is greatly improved. Meanwhile, the phase transition energy barrier is effectively reduced through the regulation of the liquid crystal monomers, and the elastomer is endowed with the ability to realize large-strain reversible deformation under extremely low thermal stimulation (such as physiological temperature) and extremely excellent actuating function.

According to the high-crystallinity aliphatic polythioether polymer and the preparation method thereof, aliphatic dithiol and dihalomethane are used as monomers during preparation, the target aliphatic polythioether polymer is synthesized through a condensation polymerization reaction, and the high-crystallinity aliphatic polythioether polymer is simple in process, safe, environmentally friendly, low in cost and suitable for industrial large-scale production. According to the method, the polythioether polymer with the molecular weight of 9.5-162kg / mol and the dispersity of 2.45-3.44 can be synthesized by adjusting the proportion of the two monomers. Besides, the chain tail end of the polythioether obtained through polymerization by the method is sulfydryl or halogen atoms, so that the polymer can be further subjected to grafting, chain extension, cross-linking and other reactions, and is expected to be applied to the fields of coatings, biological medicines, electronic information, polymer processing modification and the like. According to the polythioether polymer prepared by the method, upstream raw materials are low in price and diversified in variety. By adjusting the types of the raw materials, various polythioethers with similar structures and different properties can be obtained, and the types of polythioether polymers can be greatly enriched.

The invention is directed to flaky silver pigments having a d50 in a range of 2.0 to 100.0 µm and an aspect ratio of more than 25 which are coated at least partially with an additive component, wherein the additive component is: I) a thiol represented by the general formula (Ia): A1-S-A2 or a dithiol represented by the general formula (Ib): A1-S-S-A2, wherein A1 and A2 represent either an alkyl having 1 to 8 C-atoms with A1=A2 or A1 and A2 independently represent a moiety containing polar or polarizable functionalities selected from the group consisting of ester, carboxyl, amine, hydroxyl, benzyl, benzoic, furyl, furfuryl, pyrrolyl, pyridyl, pyrazolyl, pyrazonolyl, oxazolyl, isooxazolyl, ether and combinations thereof and wherein the polar or polarizable functionalities are spaced apart from the sulphur atom or disulphur atoms by a maximum of 3 non-aromatic C-atoms and wherein the maximum total length of the thiol or dithiol involves a chain containing a maximum of 8 non-aromatic C-atoms and the maximum length difference of A1 and A2 is within 2 atoms of each other, or II) a thiol represented by the general formula (IIa): HS-(CH(A3))x-(R1)y-A3 or represented by the general formula (IIb): HS-R4-CO-O-R5, wherein R1 is an alkylene having 1 to 6 C-atoms or a phenylene, and wherein A3 is independently selected from the group consisting of NR2 2, OH, COOH, COOR3, N-succinimide, and 1-amino 2-carboxylethyl, wherein integers x and y are either 0 or 1 and x + y = 1 or 2, and wherein R2 is independently selected from the group consisting of H, methyl, ethyl and propyl and wherein R3 is selected from the group consisting of H, methyl, ethyl or propyl, butyl, pentyl, hexyl, N-succinimide and 2-aminoacetyl acid, and wherein R4 is methylene or ethylene, and wherein R5 is selected from the group consisting of an alkyl having 1 to 6 C-atoms and N- succinimide, and wherein the maximum total length of the thiols of formulas (IIa) or (IIb) involves a chain containing a maximum of 8 non-aromatic C-atoms, or III) an amine having an ether function and no more than 8 non-aromatic C-atoms, and wherein the additive component can be one molecule or mixtures of two or more of any of the molecules represented by any of formulas (Ia), (Ib), (IIa), (IIb) and (III).

The Invention relates to a method Method for making a ruthenium catalyst comprising the steps of - Providing an aromatic dithiol substituted on adjacent aromatic carbon atoms with thiol groups, wherein in a first step an aromatic compound substituted with two leaving groups on adjacent aromatic carbon atoms are reacted with alkali trithiocarbonate to obtain an aromatic benzodithiole-thione, which in a subsequent step is reacted / hydrolysed with a base; - providing a zinc dithiolate compound by reacting the aromatic dithiol with a zinc carboxylate in an organic solvent; Reacting the zinc dithiolate compound with a ruthenium compound wherein X1 and X2 are, independently of each other, are anionic ligands and are the same or different; L and L2 are, independently of each other, neutral electron donor ligands and are the same or different; Ar is an aromatic group which may be substituted and that can be bridged with L, if L is an alkoxy group; - Obtaining a ruthenium catalyst of formula 4 or 4a, wherein R1 to R4 are, independently of each other, are selected from hydrogen, halogen, alkyl, aryl, or R.1 with R3, R3 with R4 or R2 with R4 are forming together an aliphatic or aromatic ring.