1470 results about "Sulfone" patented technology

The invention relates to a flame-retardant inorganic quick-setting material and a preparation method thereof, and the flame-retardant inorganic quick-setting material is prepared from the following raw materials: sulphoaluminate cement, aluminum-magnesium hydrotalcite, phosphorus slag powder, waste PBO fiber, an accelerator, a water reducer, a functional auxiliary agent, and 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The functional auxiliary agent comprises structural units introduced by the following monomers: 3-[N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, diphenyl (4-vinyl phenyl) phosphine oxide, 1, 3-bis (oxirane methyl)-5-(2-allyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone, 10-(4-vinyl phenyl)-10H-phenoxazine and itaconic acid. The material is high in strength, remarkable in rapid hardening and flame-retardant effect, and safe and environment-friendly to use.

The invention discloses a waterproof anticorrosive coating and a preparation method and application thereof, and relates to the technical field of coatings, and the waterproof anticorrosive coating is prepared from the following raw materials in parts by weight: 30-40 parts of carboxyl-terminated hyperbranched polyester resin, 20-30 parts of carboxyl-terminated functional polyamide, 10-15 parts of hyperbranched polyurethane containing epoxy groups, 15-20 parts of filler, 1-3 parts of (3, 6-diamino acridine-9-yl) boric acid, 1-3 parts of 1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- the component A is prepared from the following components in parts by weight: 3-5 parts of 2, 3, 5-triglycidyl-S-triazinetrione, 1-2 parts of a coupling agent, 0.8-1.2 parts of a flatting agent and 0.6-1.3 parts of a defoaming agent; the carboxyl-terminated functional polyamide comprises a structural unit introduced by the following monomers: N-(4H-1, 2, 4-triazole-4-yl) diphenylamine-4, 4 '-dicarboxylic acid, and 3, 3'-diamino-4, 4 '-difluorodiphenyl sulfone. The coating is good in waterproof and anti-corrosion performance, high in adhesive force with a base material, sufficient in solvent resistance and aging resistance and long in service life.

The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method of active end group polyarylether sulfone. The preparation method of the active end group polyarylether sulfone comprises the following steps: mixing a dihalogenated aromatic sulfone monomer, an alkaline reagent and an aprotic polar solvent, adding an aromatic dihydroxyl monomer in batches for polymerization reaction, and desalting to obtain a polyarylether sulfone system; the temperature of the polymerization reaction is 120 to 240 DEG C; the number of times of adding the aromatic dihydroxyl monomer to carry out the polymerization reaction is more than three; and mixing the polyarylether sulfone system with an end-capping reagent, and carrying out an end-capping reaction to obtain the polyarylether sulfone. According to the preparation method of the polyarylether sulfone provided by the invention, through fine synthesis of step-by-step polymerization, reaction temperature control, effective control of reaction rate and inhibition of hydrolysis rate of raw materials, the obtained polyarylether sulfone is high in purity, proper in active end group content and good in solution color and luster, and has a better toughening effect when being combined with epoxy resin.

The invention discloses an anion-regulated weak-solvation sulfuryl electrolyte and a preparation method thereof, and belongs to the technical field of battery electrolytes. The electrolyte comprises a common lithium salt, a high-donor-number lithium salt and a sulfone solvent. The coordination of lithium ions and sulfone solvents is effectively weakened through anions of the lithium salt with the high donor number, and the interaction between the lithium ions and common lithium hydrochloride ions is enhanced. By constructing the weak solvation structure, the lithium ion desolvation process and the decomposition of common lithium salt are promoted, and meanwhile, the solid electrolyte interface SEI layer rich in inorganic matters is formed through the oxidation reduction of negative ions of the weak solvation structure, so that the problem of poor compatibility of a sulfone solvent with lithium metal and a graphite negative electrode is solved; meanwhile, good electrochemical performance and wide temperature range adaptability are achieved. The electrolyte has wide application prospects in the aspects of lithium ion batteries, energy storage lithium battery systems and the like.

The invention provides a non-aqueous electrolyte, a lithium ion battery, a battery module, a battery pack and a power utilization device, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an electrolyte additive, and the electrolyte additive comprises 1, 3-propane sultone, fluoroethylene carbonate, vinylene carbonate, lithium tetrafluoroborate and a compound I shown in the formula I. The non-aqueous electrolyte is applied to the lithium ion battery, and the cycle life of the lithium ion battery is prolonged.

The invention discloses a shielding protection adhesive tape for semiconductor integrated circuit packaging and a preparation method thereof, and relates to the technical field of semiconductor integrated circuit packaging. The shielding protective adhesive tape for packaging the semiconductor integrated circuit is prepared by taking polyimide as a base material and coating a coating, and the coating comprises the following raw materials in parts by weight: 3-5 parts of modified nano silicon dioxide, 30-40 parts of N, N-dimethylformamide, 1-3 parts of a curing agent and 1-3 parts of a curing agent. The invention discloses a high-temperature-resistant epoxy resin coating which is prepared from the following components in parts by weight: 25-30 parts of N, N-dimethylformamide, 25-30 parts of a modified acrylate copolymer, 17-26 parts of ethyl acetate, 12-15 parts of epoxy resin, 1-2 parts of a silane coupling agent KH-550, 0.5-1 part of an antioxidant 1010, 0.3-0.8 part of an ultraviolet absorbent UV-327, 1-2 parts of carboxyl-terminated nitrile rubber, 2-4 parts of decabromodiphenyl ether, 0.1-0.3 part of an organic siloxane defoaming agent, 0.2-0.5 part of an acrylate flatting agent and 10-11 parts of diaminodiphenyl sulfone. The adhesive tape contains the modified nano silicon dioxide, the modified acrylate copolymer and other components, so that the performance of the adhesive tape is guaranteed; pretreatment is meticulous, preparation steps are standard, and mass production is easy; a finished product can be effectively shielded, and the packaging yield and the product stability can be improved.

The invention discloses a modified hollow fiber membrane which is composed of a separation layer, a supporting layer and a macroporous layer, the pore diameters of the separation layer, the supporting layer and the macroporous layer are sequentially increased, and a preparation method of the modified hollow fiber membrane comprises the following steps: weighing polyether sulfone / polysulfone, a pore-foaming agent, a solvent, an organic macromolecular additive and an inorganic salt additive according to the proportion to prepare a spinning solution; stirring and dissolving at 80-180 DEG C, centrifugally filtering, defoaming at 40-80 DEG C to obtain a spinning solution, carrying out coagulating bath on the spinning solution, molding, cleaning, stretching and drying to obtain the modified hollow fiber membrane. According to the preparation method, micromolecular inorganic salt pore-forming agents with different concentrations are added into a spinning solution and a coagulating bath, and interaction among inorganic salt, a polymer and a solvent is utilized, so that an inner skin layer structure and an outer skin layer structure of the hollow fiber membrane are adjusted, and a unique three-layer structure of a separation layer, a supporting layer and a macroporous layer is formed; the hydrophilic performance is stable, and the clearance on middle molecules is improved.

The invention relates to the technical field of sodium batteries, in particular to an electrolyte and a sodium battery containing the same. According to the electrolyte disclosed by the invention, the traditional solvents such as esters, sulfones and nitriles are abandoned, the sodium salt is mixed with one or more of the siloxane organic solvent, the fluorinated solvent or the ether organic solvent with a specific structure to form the electrolyte with a weak solvation structure, and additional additives do not need to be added; the method can be suitable for a sodium battery without a negative electrode (or a sodium metal negative electrode), stable operation is promoted, and the cycle performance is improved; and the electrolyte is simple in preparation process and is beneficial to promoting the industrial development of the sodium battery.

The invention discloses a high-temperature-resistant metal surface coating and a preparation method thereof, and the high-temperature-resistant metal surface coating comprises the following components in parts by weight: 40-60 parts of ceramic silicon resin, 20-30 parts of polyether sulfone modified organic fluorine resin, 8-10 parts of water-based polyimide resin, 10-15 parts of zinc chrome, 4-6 parts of boron nitride, 3-5 parts of a modified phenolic aldehyde amine curing agent, 8-15 parts of barium sulfate and 8-10 parts of short carbon fiber. The invention relates to the technical field of preparation of metal surface coatings. The metal surface coating is prepared from the following components in parts by weight: 5-8 parts of hollow glass beads, 2-4 parts of a silane coupling agent, 1-3 parts of an organic silicon defoaming agent, 8-12 parts of a dispersing agent, 1-2 parts of a thickening agent and 6-9 parts of a composite coating anti-aging agent. According to the high-temperature-resistant metal surface coating and the preparation method thereof, the ceramic silicon resin, the polyethersulfone modified organic fluororesin and the water-based polyimide resin are adopted as main resin components, a stable structure can be formed at high temperature, and the high-temperature-resistant metal surface coating can bear higher temperature.

The invention provides impact-resistant high-toughness plastic as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. Comprising the following raw materials in parts by weight: 35-45 parts of hydroxyl-terminated hyperbranched polycarbonate, 15-25 parts of LDPE (Low-Density Polyethylene) resin, 8-12 parts of inorganic filler, 4-6 parts of isocyano ethyl methacrylate, 1-3 parts of bis (1-vinyl imidazole-2-) ketone, 1-3 parts of bis (trimethylsilylated) vinyl phosphate, 1-3 parts of 1, 3, 5-triglycidyl-S-triazinetrione, 1-3 parts of 3, 3 '-diamino-4, 4'-diphenyl-1, 3, 4-triazole-2-ketone, 1-3 parts of 1, 3, 5-triazole-2-ketone, 1-3 parts of 1, 3 '-trimethylsilylated vinyl phosphate, 1-3 parts of 2, 3'-diphenyl-1, 3, 4, 5- The material is prepared from the following components in parts by weight: 1-3 parts of 4, 4 '-difluorodiphenyl sulfone, 2-4 parts of a coupling agent, 0.5-1.5 parts of an antioxidant, 0.8-1.2 parts of a compatilizer, 0.7-1 part of a catalyst and 0.8-1 part of an initiator. The plastic has the advantages of favorable mechanical properties, favorable heat aging resistance, favorable impact toughness, favorable flame retardancy and favorable environmental friendliness.

The invention provides marine concrete with salt corrosion resistance and self-repairing and a preparation method thereof.The marine concrete is prepared from, by weight, 190-210 parts of cement, 91-100 parts of a natural mineral activating group, 10-15 parts of a composite corrosion inhibitor, 30-35 parts of an exciting agent, 3-6 parts of a high-efficiency water reducing agent, 4-8 parts of a polyamide / polyether sulfone copolymer and 20-25 parts of microcapsules; the preparation method comprises the following steps: preparing the composite corrosion inhibitor and the microcapsule; mixing the cement, the natural mineral activating group, the composite corrosion inhibitor, the exciting agent and the high-efficiency water reducing agent, adding the treated polypropylene fibers and the microcapsules, reacting and curing. According to the invention, the long-acting protection and self-repairing functions of the marine concrete in a high-salt environment are realized by utilizing the cooperation of multiple physical and chemical mechanisms of various formula materials.

The invention provides a thioether oxidation catalyst, a preparation method thereof and a preparation method of pyroxasulfone. The preparation method comprises the following steps: S1, preparing a selenium source and a first solvent into a first solution; s2, adding a Lewis acid source into the first solution, and performing first mixing to obtain a second solution; s3, adding an organic alkali ligand source into the second solution, and performing second mixing to obtain a third solution; and S4, carrying out solvothermal reaction on the third solution at 100-150 DEG C to obtain the thioether oxidation catalyst. A selenium source, a Lewis acid source and an organic alkali ligand source are subjected to a combined reaction according to a specific sequence and conditions, and finally the inorganic-organic hybrid selenite catalyst with a special structure is formed under a solvothermal condition. The obtained catalyst is high in active atom utilization rate and strong in reactant molecule adsorbability, is beneficial to deep oxidation of reactants, accelerates oxidation of thioether into sulfone, and improves reaction selectivity and production efficiency.

The invention relates to a special engineering plastic polyethersulfone microcellular foam material and a preparation method thereof, belongs to the technical field of high polymer material foaming, and solves the problem that high foaming ratio, a microcellular structure and excellent mechanical properties cannot be simultaneously obtained when a macromolecular polyethersulfone material adopts an injection foaming technology in the prior art. The method comprises the following steps: step 1, pretreating raw materials; 2, melt blending: mixing the PES base material, the second component, the functional filler, the cross-linking agent and the foam stabilizer, carrying out melt blending, granulating, and drying to obtain granules; 3, injection foaming: injecting the granules into an injection machine, adding a composite foaming agent into the injection machine, mixing, and performing injection foaming molding to obtain an injection-molded foaming material; and 4, curing: irradiating the injection-molded foam material with rays to obtain the special engineering plastic PES microcellular foam material.

Disclosed is an additive for a non-aqueous electrolyte solution, which contains a cyclic sulfone compound represented by formula (1). X1 represents a sulfonyl group or a carbonyl group, and Z represents a monovalent group represented by formula (21), (22), (23) or (24). # imgabs0 #

The present application provides an electrolytic solution for magnesium batteries, a method for preparing the same, and a magnesium battery, comprising a non-aqueous solvent and an electrolyte salt, wherein the non-aqueous solvent is selected from one or more of imidazole ionic liquids, pyrrole ionic liquids, piperidine ionic liquids, ether compounds, ester compounds, pyridine compounds, nitrile compounds, sulfone compounds, or ketone compounds; the electrolyte salt has a chemical formula [MgmLinXo(HMDS)2m+m−oRp]·Mq. The electrolytic solution for magnesium batteries provided by the present application is endowed with good stability, strong water resistance and impurity resistance, and excellent electrochemical performance under the mutual synergistic effect among the components, and excellent electrochemical performance under the mutual synergistic effect among the components, and at the same time, the electrolytic solution can promote reversible deposition-dissolution of magnesium, reduce the over-potential, inhibit formation of a passivation layer of magnesium salts on the surface of the anode, and increase the charging-discharging specific capacity and cycling stability of the magnesium battery.

The invention discloses an MLCC release film base film and a preparation method thereof, and relates to the technical field of release films, the MLCC release film base film comprises a core layer and a functional coating layer arranged on the outer surface of the core layer; the core layer is prepared from the following raw materials: PET (Polyethylene Terephthalate) resin, functional polyester containing triazolyl tetrafluorophenyl, a coupling agent, reinforced fibers, an antioxidant and a lubricant; the functional coating layer is prepared from the following components: hydroxyl-terminated hyperbranched polyester, isocyano ethyl methacrylate, vinyl trimethoxy silane, nano filler, 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone, 2, 2 '-bis (trifluoromethyl) diaminobiphenyl, a photoinitiator, a catalyst A and a diluent. The base film is low in surface roughness and warping degree, good in high temperature resistance, high in flatness and appropriate in stiffness.

The invention discloses a crown ether grafted polyarylether sulfone ion separation membrane as well as a preparation method and application thereof, and belongs to the technical field of ion separation membranes, collaborative optimization is realized through crown ether accurate grafting and ultrathin ordered membrane formation: a main chain of polyarylether sulfone is grafted with 4 '-aminobenzo-12-crown-4 to form an inherent channel adapted to Li, and the specific surface area of the main chain is increased; the ultrathin film is prepared by a water surface spreading method, and the ion transmission path is shortened. Finally, in a LiCl / MgCl system, Liion flux has high selectivity, high permeation-high selectivity cooperation is preliminarily realized, the chemical synthesis step can be amplified to a kilogram level, and after a DPAES-g-CE / dichloromethane solution is dropwise added to the water surface, the DPAES-g-CE / dichloromethane solution is rapidly spread to form a film without precise equipment; the raw materials are industrial-grade monomers and have no toxic residues, the membrane can be recycled and reused through dichloromethane, the equipment cost is reduced by about 90%, and industrialization is easy; the main chain of the polyaryl ether sulfone is high in rigidity and resistant to high temperature and chemical corrosion; crown ether grafting avoids molecular chain agglomeration, and the swelling rate is far lower than that of a traditional sulfonated membrane.

The invention discloses a microalgae membrane concentration system and method. The system comprises a microalgae culture solution storage tank, a pretreatment unit, a membrane concentration unit and a concentrated solution collection tank which are connected in sequence, the microalgae culture solution storage tank is provided with a stirring device, a liquid level sensor and a temperature sensor; the pretreatment unit comprises a filter assembly, and the filter assembly adopts multi-stage filtration and comprises a coarse filter screen and a fine filter screen; the membrane concentration unit is internally provided with a filter membrane, the filter membrane adopts a hollow fiber membrane component, the membrane is made of polyvinylidene fluoride or polyether sulfone, a cross-flow filtration mode is adopted, the membrane concentration unit is provided with a pressure regulating device, a circulating pump and a backwashing system, and the backwashing system adopts gas and liquid for alternate washing. The pressure adjusting device is used for adjusting the pressure difference between the two sides of the fiber membrane component; and the concentrated solution collecting tank is provided with a cooling device and a concentration monitoring device. According to the system and the method, the cleaning and concentration efficiency is higher, and the quality of microalgae obtained through concentration is higher.

The invention discloses a high-toughness biaxially oriented nylon film and a production method thereof. Comprising the following raw materials in parts by weight: 40-50 parts of copolymerized nylon resin, 10-20 parts of nylon 12, 15-25 parts of thermoplastic polyamide elastomer, 3-6 parts of nanofiller, 1-3 parts of coupling agent, 10-20 parts of reinforced fiber, 5-8 parts of additive, 3-7 parts of ethylene-methyl acrylate-glycidyl methacrylate terpolymer and 6-10 parts of modified cellulose nanocrystal. The invention relates to a flame-retardant polyamide resin, which is prepared from the following components in parts by weight: 2-4 parts of amino-terminated hyperbranched polyamide and 1-3 parts of 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The film is high in tensile strength, good in tear resistance and excellent in barrier property and low-temperature impact resistance.

The invention discloses a cycloalkenyl sulfone derivative as well as a preparation method and application thereof. In particular, the present invention relates to a compound represented by general formula (IA) or a stereoisomer thereof, a preparation method thereof, a pharmaceutical composition containing the compound, and an application thereof in preparation of drugs for treating diseases. The compound has a structure as shown in a formula (IA). # imgabs0 #

This application relates to sulfoxide and sulfone compounds of Formula (X) and other compounds that may be useful to activate glucokinase as part of a treatment for various diseases including diabetes. Further encompassed are pharmaceutical compositions comprising a compound according to the invention.

The invention belongs to the technical field of photoinitiators, and particularly relates to a ketoxime ester photoinitiator as well as application and a photosensitive combination thereof. Compared with the prior art, the novel photoinitiator has the advantages that by introducing a sulfone phenyl specific structure to a ketoxime ester group and the like, excellent photosensitivity can be shown in the optical wavelength range of 280-400 nanometers, and compared with OXE-01 and OXE-02 commonly used in the market, the novel photoinitiator can show better photoinitiation efficiency under an ultraviolet visible (UV-Vi s) LED light source.

The invention relates to the field of biological materials, in particular to a thioketal bond modified 17-type collagen dopamine drug-loaded nanoparticle composite microneedle patch and a preparation method and application thereof, and the microneedle patch is composed of dopamine drug-loaded nanoparticles, thioketal bond modified recombinant 17-type collagen and a polymer substrate. The thioketal bond modified 17-type collagen and polyvinyl alcohol are subjected to physical and chemical double-crosslinking to form hydrogel, then the hydrogel is loaded with drug-loaded nanoparticles, and the hydrogel and a polymer substrate form the ROS and pH value microenvironment double-response collagen microneedle patch loaded with bioactive substances. When the collagen hydrogel is applied to the skin, the tip of the microneedle reaches the area where the hair follicle stem cells exist in a painless and minimally invasive mode, and due to the change of microenvironment molecules in the skin tissue, the breakage of thioketal bonds in the collagen hydrogel can be promoted, so that active oxygen is removed, and the wrapped IGF-1 is released into the hair follicle stem cells; and a potential treatment strategy is provided for androgenetic alopecia.

The invention discloses a dual-modified polyethersulfone membrane and a preparation method thereof, and relates to the technical field of polyethersulfone membranes. According to the technical scheme, the preparation method comprises the following steps: carboxylating polyether sulfone to obtain carboxylated polyether sulfone; the preparation method comprises the following steps: carrying out cationization treatment on chitosan to prepare cationic chitosan; the prepared carboxylated polyether sulfone, cationic chitosan and an additive are prepared into the dual-modified polyether sulfone membrane through a phase inversion method. The problems of general membrane forming property, insufficient infiltration capacity, poor hydrophilicity, membrane body pollution and the like of the polyether sulfone membrane in the actual use process are solved, meanwhile, the biocompatibility of the polyether sulfone membrane is improved, and the service life of the membrane is also greatly prolonged.

The invention discloses an ionic liquid-based electrolyte, a wide-temperature-range high-voltage supercapacitor and application of the wide-temperature-range high-voltage supercapacitor. The wide-temperature-range high-voltage supercapacitor comprises a eutectic ionic liquid system and an organic solvent, the eutectic ionic liquid system comprises at least two ionic liquids; the ionic liquid comprises cations and anions; the positive ions are selected from at least one of pyrrolidinyl positive ions, piperidinyl positive ions, imidazolyl positive ions and quaternary ammonium positive ions containing different side chains; the anion is selected from at least one of tetrafluoroborate, hexafluorophosphate, bis (trifluoromethylsulfonyl imine), bis (fluorosulfonyl imine) and tetracyanoborate; the organic solvent comprises at least one of fluorinated carbonic ester, fluorinated carboxylic ester, sulfones, ethers and nitriles. The supercapacitor based on the ionic liquid-based electrolyte can stably operate in a wide temperature range, so that the wide-temperature-range high-voltage supercapacitor can be suitable for an extreme working environment, and high energy density and power density are achieved.

The invention belongs to the technical field of membrane separation, and particularly relates to a method for preparing a high-flux hollow fiber nanofiltration membrane based on interfacial polymerization, the obtained membrane and application. The method comprises the following steps: firstly, carrying out pre-adsorption treatment on a polyethersulfone hollow fiber ultrafiltration base membrane through a polyethyleneimine aqueous solution to form a reactive anchoring layer; then sequentially dipping in an aqueous phase solution containing piperazine, sodium phytate and nanoscale cellulose whiskers and an organic phase solution containing trimesoyl chloride and 5-isocyanate isopeptide acyl chloride for interfacial polymerization; and finally, carrying out heat treatment on the obtained primary composite membrane, and completing a gas-phase cross-linking reaction in a glutaraldehyde steam atmosphere. According to the method, the hollow fiber nanofiltration membrane with high flux, high selectivity, excellent chlorine resistance and pollution resistance is successfully prepared through a multi-stage strengthening process, and the hollow fiber nanofiltration membrane is suitable for the fields of drinking water purification, industrial wastewater reuse, material separation and the like.

The invention discloses a bio-based fiber reinforced composite material and a preparation method thereof, and belongs to the technical field of bio-based fiber composite materials. The bio-based fiber reinforced composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of nylon 6, 10 to 20 parts of bio-based aramid fiber, 5 to 10 parts of modified carbon fiber, 2 to 6 parts of hyperbranched polyester modified zinc oxide and 1 to 3 parts of antioxidant, the bio-based aramid fiber is prepared by reacting 2, 5-furandicarbonyl chloride with two diamine monomers, and the two diamine monomers respectively contain trifluoromethyl and sulfuryl; the modified carbon fiber is obtained by grafting polyamidoamine on the surface of carbon fiber; the hyperbranched polyester terminal group of the hyperbranched polyester modified zinc oxide contains an epoxy group. The modified carbon fiber, the bio-based aramid fiber and the hyperbranched polyester modified zinc oxide are added into the nylon matrix, so that the composite material is endowed with good ultraviolet resistance, comprehensive mechanical properties and durability.

The present invention relates to bio-based bisphenol monomer of formula I and process of preparation thereof. Specifically, the present invention relates to bio-based bisphenol monomers of formula I containing multiple alkoxyl groups, and polyphenols. The bisphenol monomers of formula I contain built-in methoxyl groups, which represent latent phenolic hydroxyl groups and could conveniently be de-blocked to phenolic hydroxyl groups leading to formation of polyphenols containing catechol / phloroglucinol units with anti-oxidant properties and are potentially useful in various applications like cosmetics, polymer additives and so on. Further, the present invention relates to process of preparation of polymers using bisphenol monomer of formula I as valuable building blocks wherein the high performance thermoplastics are poly(ether sulfone)s, poly(ether ether ketone)s, polyesters, polycarbonates, polyphosphonates, etc. and thermosetting resins are epoxies, cyanate esters, phthalonitriles, propargyl ethers, etc.

The present invention provides a compound of formula (I) as a WRN inhibitor, a compound or a pharmaceutically acceptable salt, isotope variant, tautomer or stereoisomer thereof. The invention also provides a pharmaceutical composition comprising the compound, and its use in the treatment of cancer.

The invention discloses a preparation method of polysulfone with stable color and reduced yellowness, which comprises the following steps: by using N-methyl pyrrolidone as a reaction solvent, reacting bisphenol A with 4, 4 '-dichlorodiphenyl sulfone in the presence of an acid-binding agent to generate polysulfone; wherein the N-methyl pyrrolidone contains N-methyl pyrrolidone peroxide, and the molar content of the N-methyl pyrrolidone peroxide in the N-methyl pyrrolidone is less than or equal to 0.05%. The polysulfone with stable color and reduced yellowness value can be synthesized by controlling the content of peroxide impurities in the N-methyl pyrrolidone.