55 results about "Precursor polymer" patented technology

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The application discloses a kind of multi-element ultra-high temperature nanocomposite ceramic matrix composites and preparation method thereof, the multi-element ultra-high temperature nanocomposite ceramic matrix composites are composed of multi-element ultra-high temperature nanocomposite ceramic and porous fiber body, wherein multi-element ultra-high temperature nanocomposite ceramic is composed of oxygen-free silicon-based ceramic and multi-element transition metal carbonitride uniformly distributed therein, and the preparation method is: at least two metal element complexes are reacted with silicon-based polymer to obtain single-source precursor polymer;Then porous fiber body is placed in single-source precursor polymer solution for multiple times of impregnation pyrolysis, and the composite material provided by the application has a nanocomposite structure, an ultra-high temperature ceramic multi-element single-phase solid solution, the type, content and ratio of metal elements can be adjusted, the ultra-high temperature ceramic in the matrix is uniformly distributed and has a nanoscale grain size, and the method can avoid damage to the fiber during preparation, thereby achieving simultaneous improvement of the mechanical properties and oxidation ablation resistance of the composite material.

Anion exchange polymers comprise a plurality of repeating units of formula (I). The polymer may be synthesized from a super acid catalyzed polyhydroxyalkylation reaction of monomers Ar1′, Ar2′, and X1′ to form a neutral precursor polymer followed by a Menshutkin reaction to convert the neutral precursor polymer to the anion exchange polymer.Anion exchange membranes and membrane electrode assemblies incorporating the anion exchange polymers are also described.

The application relates to a polyaryletherketone resin, a preparation method thereof and application thereof in functional membranes, and belongs to the technical field of functional polymer materials. First, an aromatic monomer 4,4'-((9-(6-(4-tritylphenoxy)hexyl)-9H-carbazole-3,6-diyl)bis(diphenylmethylene))diphenol (monomer 1) containing a dense benzene ring and a flexible side group is prepared; then, through a nucleophilic substitution reaction catalyzed by K2CO3, a polyaryletherketone precursor polymer containing a Schiff base is prepared by taking 1,1-bis(4-fluorophenyl)-N-phenylmethane imine, 4,4'-dihydroxydiphenyl ketone and the monomer 1 as raw materials; after the polyaryletherketone precursor polymer is sulfonated by concentrated sulfuric acid, a polyaryletherketone resin containing sulfonic acid groups is prepared; after the polyaryletherketone resin is dissolved in dichloroacetic acid, a polyaryletherketone ion exchange functional membrane is prepared by adopting a flow extension method, and the membrane has the advantages of excellent oxidation resistance stability, good dimensional stability and solution processing property and the like.

This invention discloses a method for preparing a self-healing, antibacterial dynamic hydrogel and its coating application. The method includes: 1. Reacting konjac glucomannan with sodium periodate to achieve aldehyde functionalization, and mixing it with sodium alginate powder to prepare a precursor polymer solution A; 2. Mixing an acylhydrazide or hydroxylamine small molecule crosslinking agent with an aminoglycoside drug to prepare an amino crosslinking agent solution B, and preparing a calcium salt ionic crosslinking agent solution C; 3. Mixing the three solutions and allowing them to stand to obtain a hydrogel. The application involves coating a hydrogel mixture solution onto a biodegradable metal surface after preparing a polyethyleneimine auxiliary layer and then gelling it. This invention utilizes aldehyde-functionalized oxidized konjac glucomannan and two crosslinking agents to form acylhydrazone, oxime, and imine bond networks, endowing the hydrogel with self-healing, self-responsive, and long-term antibacterial properties. The hydrogel of this invention improves the biocompatibility, antibacterial properties, and stability of biodegradable metal substrates, making it suitable for biodegradable implantation applications.

A polymer composition including particles having a ratio of an average particle diameter D90 to an average particle diameter D50 of 2.3 or less, and a polymer having a dielectric loss tangent of 0.01 or less, and applications thereof.

The invention discloses a grafted sulfonated polymer membrane containing a spiro structure, a preparation method of the grafted sulfonated polymer membrane and application of the grafted sulfonated polymer membrane in an electrochemical energy storage device, and belongs to the technical field of polymer separation membranes. The membrane material comprises a polymer prepared by a polymerization reaction, and monomers for the polymerization reaction comprise an aromatic monomer with a spiro indane structure and a monomer containing an imidazole group; the polymer is characterized in that in a repetitive unit of the polymer, a side chain containing a sulfonic group is grafted on a nitrogen atom of an imidazole group. The preparation method comprises the following steps: carrying out polymerization reaction on the two monomers to obtain a precursor polymer; then, reacting the precursor polymer with a sulfonating agent to realize grafting of a sulfonic group side chain on an imidazole group nitrogen atom; and finally, preparing the membrane through a solution tape casting method. According to the preparation method, a sulfonic side chain is introduced into a spiro polymer skeleton with high chemical stability in a grafting manner, so that an efficient ion conduction channel is constructed, meanwhile, the structural stability of the membrane material is kept, and the prepared membrane material shows excellent comprehensive performance in application of alkaline aqueous organic flow batteries and the like.

The invention discloses polyaryletherketone resin, a preparation method and application of the polyaryletherketone resin in a functional film, and belongs to the technical field of functional polymer materials. The preparation method comprises the following steps: firstly, preparing an aromatic monomer 4, 4 '-((9-(6-(4-triphenylmethyl phenoxy) hexyl)-9H-carbazole-3, 6-diyl) bis (diphenylmethylene)) diphenol (monomer 1) of a dense benzene ring containing a flexible side group, then taking 1, 1-bis (4-fluorophenyl)-N-phenylmethane imine, 4, 4'-dihydroxydiphenylketone and the monomer 1 as raw materials, and carrying out a nucleophilic substitution reaction catalyzed by K2CO3, so as to obtain the high-molecular polymer. A polyaryletherketone precursor polymer containing Schiff base is prepared; a polyaryletherketone precursor polymer is sulfonated with concentrated sulfuric acid, polyaryletherketone resin containing sulfonic acid groups is prepared, the polyaryletherketone resin is dissolved in dichloroacetic acid, a film is laid through a casting method, the polyaryletherketone ion exchange functional membrane is prepared, and the membrane has the advantages of being excellent in anti-oxidation stability, good in size stability, good in solution processability and the like.

The embodiment of the invention relates to the field of batteries, and provides a battery monomer and a preparation method thereof, a battery device, a power utilization device and an energy storage device. The preparation method of the battery monomer comprises a process of preparing a composite diaphragm and a process of assembling the composite diaphragm, a positive electrode plate and a negative electrode plate, and the composite diaphragm comprises a first membrane layer, a porous membrane layer and a second membrane layer which are stacked, the preparation process of the composite diaphragm comprises the following steps: preparing sol containing a carbon precursor polymer, a pore inducer and a cross-linking agent into a fiber membrane; performing heat treatment on the fiber membrane to obtain a porous membrane layer; and compounding the porous membrane layer and the membrane layer to obtain the composite diaphragm. According to the embodiment of the invention, the porous carbon nanofiber membrane is introduced to one side of the base membrane, so that the purpose of promoting reversibility of lithium precipitation is achieved, and the technical effects of effectively controlling and reducing formation of lithium dendrites in the later period of battery circulation and avoiding diving and potential short-circuit risks of the performance of a battery cell are achieved.

A method of making spherical gettering particles for an environmental barrier coating according to an exemplary embodiment of this disclosure, among other possible things includes spraying liquid preceramic polymer into a chamber via a nozzle to form liquid droplets, curing the liquid droplets to form spherical particles in the chamber, and converting the spherical particles to spherical ceramic gettering particles in a fluidized bed. A method of making spherical gettering particles for an environmental barrier coating and an article are also disclosed.

The present invention relates to the field of the synthesis of polymers. Disclosed are a polypropyleneimine derivative, and a preparation method therefor and a use thereof. The method comprises: firstly, initiating polymerization of an oxazine derivative monomer by means of an initiator, then removing a side chain from a polymer to obtain polypropyleneimine, selecting the polypropyleneimine for a further reaction to obtain a zwitterionic precursor polymer, and finally, hydrolyzing the precursor polymer to obtain a polypropyleneimine zwitterionic derivative. The polypropyleneimine zwitterionic derivative prepared in the present application contains a zwitterionic group in each or some of repeating units. The zwitterionic group endows the polymer with good hydrophilicity and anti-protein non-specific adsorption properties. The polymer has no immunogenicity, will not be recognized by the immune system and captured by immune cells, can be used as a drug carrier and a gene vehicle, and has good blood circulation stability. Alternatively, the polymer is used as a biological material, a medical device, an implantable material, or a cell delivery material and has good anticoagulation, anti-rejection, and biofilm properties.

The invention discloses a carbon source doped structured SiOC ceramic as well as a preparation method and application thereof, and relates to the technical field of ceramics. The method comprises the following steps: preparing a SiOC ceramic precursor solution; uniformly dispersing a carbon source material in the SiOC ceramic precursor solution to obtain a doped solution; obtaining a SiOC precursor polymer with a negative Poisson's ratio structure from the doped solution by adopting a 3D printing technology; sequentially carrying out curing, cracking and heat treatment on the SiOC precursor polymer to obtain the carbon source doped structured SiOC ceramic, the conductivity of the SiOC ceramic is regulated and controlled by changing the doped carbon source material, the conductivity with the semiconductor level is obtained, the high piezoresistive coefficient is obtained, and therefore the pressure change can be well monitored. The performance of the SiOC ceramic material can be effectively improved by regulating and controlling the doping concentration and the sintering process.

Provided is a hydrogel precursor polymer derived from a poly (asparagine) (PAsPm) comprising cleavable and crosslinkable moieties attached to a pendant carboxylic acid group of the poly (asparagine); and a hydrophilic moiety also attached to a pendant carboxylic acid group, such as an ether-containing moiety obtained by ring opening a polysuccinimide with 2-(2-aminoethoxy) ethanol.

The invention discloses a stretchable elastic carbon nanofiber membrane material and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving polystyrene and a carbon precursor polymer to prepare a spinning solution, spinning according to a certain combination sequence to obtain a multi-layer carbon precursor nanofiber membrane, and inducing the construction of a micro-buckling structure of the carbon precursor nanofiber membrane by utilizing a thermal shrinkage effect of a polystyrene layer to obtain the multi-layer carbon precursor nanofiber membrane. Polystyrene is dissolved and removed through ethyl acetate, a nanofiber membrane only retaining a pure carbon precursor is obtained, and finally the stretchable elastic carbon nanofiber membrane is obtained through pre-oxidation and carbonization. The elastic carbon nanofiber membrane prepared by the invention has excellent tensile resilience, high conductivity and high specific surface area, and can be applied to the application fields of national defense and military industry, energy environmental protection, aerospace, flexible electronics and the like.

The disclosure relates to a metalated-sulfonated styrenic block copolymer (SO3−M+-SBC) composition. The composition is obtained by epoxidation of SBC precursor followed by alcoholysis of epoxidized SBC using Grignard reagent, and then lithiation and sulfonation (in-situ). The precursor polymer can have any of a sequential diblock, triblock or a coupled structure, which can be extended to a tetrablock, a pentablock copolymer, with at least one of the blocks metalated-sulfonated. The SO3−M+-SBCs are suitable for use as electrolytes in energy storage devices. The SO3−M+-SBC is converted to sulfonic acid styrenic block copolymer (SO3−H-SBC) upon acidification. The SO3−H-SBCs are suitable for use as cation exchange membranes and numerous ion and moisture transport applications.

A method of forming a crosslinked film comprising crosslinking a precursor film disposed on a surface wherein the precursor film comprises a precursor polymer and a crosslinking agent; and either: the precursor polymer is substituted with one or more carbonyl groups and the crosslinking agent comprises a plurality of amine groups, or the precursor polymer is substituted with one or more amine groups and the crosslinking agent comprises a plurality of carbonyl groups. The crosslinked film may be used as a high thermal conductivity underfill in a 3D-chip.

A method of forming a polymer film includes providing a substrate and a superstrate, and providing a precursor polymer solution. The precursor polymer solution is flowed by capillary action between the substrate and the superstrate. The precursor polymer solution is cured to form the polymer film. The method can be referred to as capillary crawl film formation (CCFF), and can be implemented in the simple, low-cost and / or highly scalable manufacture of thin polymer films.

The invention relates to the technical field of temperature detection and strain testing, and discloses a wireless passive / temperature strain two-parameter sensing element based on a precursor polymer ferroelectric composite ceramic film and a preparation method of the wireless passive / temperature strain two-parameter sensing element. The composite dielectric coating comprises a substrate, an insulating layer and a composite dielectric layer from bottom to top, and the composite dielectric layer is prepared by mixing a precursor ceramic polymer with ferroelectric ceramic powder through high-temperature pyrolysis; the temperature sensitive structure and the strain sensitive structure are both comb tooth structures and are matched with the internal inductor and the external inductor to form an independent LC resonant circuit, the dielectric constant or the polar plate distance is changed through the environment temperature and deformation, the LC resonant frequency is changed, the temperature and the strain are effectively measured, and the working state of a measured structural part can be visually reflected.

The invention discloses an ultrahigh-temperature ceramic film with improved conductivity through grafting modification and a preparation method of the ultrahigh-temperature ceramic film, and relates to the technical field of ultrahigh-temperature ceramic preparation. The method comprises the following steps: stirring and dispersing a SiHfBCN ceramic precursor polymer, MWCNTs-COOH and triton X-100 in methylbenzene, then adding 2-benzyl-2-dimethylamino-4 '-morpholinyl phenylbutanone, and stirring and dissolving to prepare a mixed solution; spin-coating on the surface of a pretreated silicon wafer to prepare a polymer film; and carrying out ultraviolet irradiation, pyrolyzing and cooling to prepare the ultrahigh-temperature ceramic film with improved conductivity through grafting modification. The room temperature resistivity of the modified SiHfBCN ceramic thin film can be reduced by about 70% to the maximum, and the problem that an existing ceramic thin film is poor in conductivity is solved.

The present application belongs to the technical field of adsorbent materials, and particularly relates to a kind of amidoxime-based polymer adsorbent material and its preparation method and application.The present application uses tannic acid and tetrafluoro-p-xylylene dinitrile as raw materials, forms precursor polymer with three-dimensional network cross-linking structure through cross-linking reaction, introduces amidoxime group through amidoxime reaction, and obtains amidoxime-based polymer adsorbent material.The present application realizes high selective coordination capture of gold ions by introducing amidoxime group;in-situ reduction of gold ions is realized by using tannic acid phenolic hydroxyl group;high stability of the material under harsh environment is endowed by using fluorine-containing rigid cross-linking skeleton.The material can directly complete selective adsorption, in-situ reduction and elemental gold recovery of gold from complex electronic waste leaching liquor in one step, omits elution and additional reduction steps in traditional process, and has the advantages of simple process, high efficiency, good selectivity, low cost, green environmental protection and the like.

This invention discloses a method for extending the shelf life of polyamic ester (PAE) solutions during the manufacturing of positive-type photosensitive polyimide (PSPI) precursor resins. With the addition of certain acids within a specified loading range to the reaction solution after the acetal esterification reaction, the shelf of the PAE solution can be significantly increased by decreasing the rate of imidization. The acid additive may consume part or all of the impurities generated from the acetal esterification reaction, which improves the stability of the PAE polymer. This invention substantially improves the feasibility and manufacturing cost of positive-type PSPI precursor polymers.

The invention provides a degradable agricultural functional film and a preparation method thereof, and relates to the technical field of degradable materials. The preparation method of the degradable agricultural functional film comprises the following steps: mixing adipic acid, 1, 4-butanediol, terephthalic acid, ethylene glycol, lactic acid, starch, an inorganic filler, an anti-aging agent, tetrabutyl titanate and phosphite, carrying out polymerization reaction to obtain an anti-aging layer precursor polymer, and preparing the anti-aging layer precursor polymer into an anti-aging layer by adopting a blow molding machine; replacing an anti-aging agent with an anti-fogging agent to prepare an anti-fogging layer; mixing tungstate with a polymer monomer and other auxiliaries to obtain an ultraviolet light reversible color-changing pigment precursor, and coating the ultraviolet light reversible color-changing pigment precursor on the surface of the anti-aging layer subjected to laser etching to obtain an ultraviolet light reversible color-changing layer; and combining the three layers of materials to prepare the degradable agricultural functional film. By reasonably designing the raw materials, the agricultural functional film has degradability and photochromic property while ensuring high strength and stretchability.

The present application relates to a kind of temperature-resistant optical fiber with ceramic coating and its preparation method and system, comprising the following steps: coating silane coupling agent coating on bare optical fiber, form chemical grafting transition layer after curing, obtain first optical fiber;Flexible bonding coating is coated on first optical fiber, form flexible bonding pre-cured layer after curing, obtain second optical fiber;Flexible bonding coating includes first ceramic precursor polymer and flexible adjusting component;Rigid protective coating is coated on second optical fiber, form rigid protective pre-cured layer after curing, obtain first temperature-resistant optical fiber with polymer state coating;Rigid protective coating includes second ceramic precursor polymer and modified reinforcing filler;First temperature-resistant optical fiber can be treated by offline heat to form ceramic state coating, obtain second temperature-resistant optical fiber.The present application can obtain first temperature-resistant optical fiber with temperature resistance not more than 350 DEG C and second temperature-resistant optical fiber with temperature resistance above 600 DEG C, can effectively take into account coating processability and high temperature serviceability.

The invention relates to the field of anion exchange polymer membrane preparation, and discloses an alkali-resistant and high-temperature-resistant anion exchange polymer easy to prepare and a preparation method thereof.The preparation method comprises the steps that a non-aromatic precursor polymer with a latent functional group is constructed, and the non-aromatic precursor polymer is prepared into a gradient porous membrane through a phase inversion technology; in the unified treatment step, aromatization of the main chain of the precursor and activation of the functional group are synchronously realized, so that the porous structure is chemically fixed; according to the method, the construction of a high-performance main chain and the introduction of a high-activity functional group are thoroughly separated in time sequence, so that the problem of associated degradation in a traditional synthesis path is avoided, and the final structural defect removal step is combined; and the finally obtained polymer film has relatively high structural integrity and chemical purity on the molecular scale.

The application discloses a controllable performance spiral winding type artificial muscle and a preparation device and a regulation method thereof. The device comprises a winding device part, a spiral device part and a controller and a main control part. The method comprises the following steps: winding a precursor polymer fiber and a metal nickel wire through the winding device part, and then performing an electric heating treatment to obtain a treatment sample; performing a spiral treatment on a mold mandrel, a spiral guide groove and the treatment sample through the spiral device part, and then performing a heat treatment to obtain a spiral sample; and removing the spiral guide groove on the spiral sample to obtain the spiral winding type artificial muscle. The application adopts special winding and spiral equipment to adjust a manufacturing process, and completes a spiral winding structure artificial muscle with specific parameters, so that the performance stability and the performance controllability are greatly improved, and then the work capacity of the artificial muscle in the face of different work objects is improved, the coordinated control on the output force and the output displacement is realized, and the application range in the fields of bionic robots, soft robots, wearable exoskeletons and the like is expanded.

Composition, intended for forming a protective and / or sealing coating or adhesive for a substrate, based on a silicon preceramic polymer and a nitric acid-resistant filler, Process and Associated Coated Substrate. The invention relates to a composition, intended for forming a protective and / or sealing coating or adhesive for a substrate, comprising a mixture of the following constituents: - at least one silicon-based preceramic polymer precursor; - at least one nitric acid-resistant filler (HNO3); - optionally, at least one organic solvent; - optionally, at least one nitric acid pickling inhibitor and / or catalyst. Figure for the abstract: Fig. 2

A method of forming a crosslinked film comprising crosslinking a precursor film disposed on a surface wherein the precursor film comprises a precursor polymer and a crosslinking agent; and: the prec

The invention discloses a preparation process of a silicon carbide-based sweating cooling medium. The preparation process comprises the following steps: weighing xylene, adding a hyperdispersant for oscillation dissolution, adding polycarbosilane for oscillation dissolution, then adding kaolin, adding silicon carbide micro powder after oscillation dispersion is completed, and stirring to obtain ceramic slurry; the preparation method comprises the following steps: weighing a self-skinning polyurethane foam raw material and a high-resilience polyurethane raw material, mixing to obtain polyurethane slurry, adding carbon fiber powder, and uniformly stirring; mixing the ceramic slurry with a polyurethane raw material, foaming in a mold at room temperature for 24 hours, demolding, drying and taking out; the preparation method comprises the following steps: grinding a ceramic biscuit, carrying out mold pressing, putting the ceramic biscuit into a sintering furnace, carrying out cross-linking curing on a polycarbosilane precursor polymer, heating to 1000 DEG C at a speed of 1 DEG C / min under the protection of a nitrogen atmosphere, then heating to 1300 DEG C at a speed of 3 DEG C / min, carrying out heat preservation for 2 hours, and finally, naturally cooling to room temperature, thereby obtaining the silicon carbide-based porous ceramic which is more uniform in structure and better in mechanical property. And the pore uniformity and the distribution uniformity are better.

The invention discloses an aryl quinine onium anion exchange membrane containing a conjugated twisted structure, and also discloses a preparation method of the anion exchange membrane, and the preparation method comprises the following steps: mixing Ar1, Ar2 and 3-quinuclidinone hydrochloride, dissolving in a solvent I, adding a catalyst I and a catalyst II, and reacting to obtain an aryl quinine precursor polymer; dissolving the precursor polymer in a solvent III, adding a catalyst III and a nucleophilic reagent I, and carrying out quaternization reaction to prepare an aryl quinine onium polymer; dissolving the aryl quinine onium polymer in a solvent III, and filtering to obtain a membrane casting solution; and carrying out tape casting and drying on the membrane casting solution, and then carrying out ion exchange to obtain the anion exchange membrane containing the conjugated twisted structure. The anion exchange membrane has the characteristics of high mechanical strength, high conductivity and good alkali-resistant stability. According to the method, the stability and the ionic conductivity of the anion exchange membrane are improved by introducing a conjugate distortion structure, and the method is simple and convenient to operate and easy for industrial production.

The application discloses a kind of fire-retardant wear-resistant multilayer polyethylene pipe and preparation method thereof.The pipe is sequentially from inside to outside for inner layer composite layer, intermediate pressure-bearing layer and outer layer fire-retardant composite layer.The outer layer constructs halogen-free fire-retardant system with magnesium hydroxide and low softening point glass powder, and introduces boron-containing polysiloxane ceramic precursor polymer and multifunctional olefin crosslinking agent, and cooperates with maleic anhydride grafted polyethylene to realize interface regulation.The glass powder is subjected to composite surface treatment with zirconium phosphate primer and polysilazane topcoat, and is added in the third stage of melt blending in the latter section.By three-stage melt blending and negative pressure exhaust, the thermal history and volatile matter are controlled, and a multilayer pipe with fire-retardant and heat release suppression, inner wall wear resistance and pressure-bearing reliability is obtained.