26 results about "Precursor polymer" patented technology

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.

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.

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.

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.

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.

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 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.

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 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 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.

The invention discloses a flame-retardant wear-resistant multi-layer polyethylene pipe and a preparation method thereof. The pipe sequentially comprises an inner composite layer, a middle pressure-bearing layer and an outer flame-retardant composite layer from inside to outside. The outer layer is a halogen-free flame-retardant system constructed by magnesium hydroxide and low-softening-point glass powder, a boron-containing polysiloxane ceramic precursor polymer and a multifunctional olefin cross-linking agent are introduced, and maleic anhydride grafted polyethylene is matched to realize interface regulation and control. The glass powder is subjected to composite surface treatment of zirconium phosphate base coating and polysilazane outer coating, and is laterally fed and added in the middle and rear sections of the third section of melt blending. The thermal history and volatile components are controlled through three-section melt blending and negative pressure exhaust, and the multi-layer pipe with flame retardance, heat release inhibition, wear resistance of the inner wall and pressure bearing reliability is obtained.

A method of manufacturing a ceramic composite includes: prepregging a plurality of porous fiber cloths, a powder compact, a combination thereof, or additively-manufactured matrix and fibers, with a preceramic polymer composition to form a preform composite body; curing the composite body followed by pyrolyzing the cured composite body to obtain a ceramic composite body; densifying the ceramic composite body by sequentially performing a plurality of densification cycles to obtain a densified ceramic composite body, wherein each densification cycle includes: submerging the ceramic composite body in the preceramic polymer composition to impregnate the ceramic composite body; subjecting the impregnated ceramic composite body to a vacuum; curing the impregnated composite body; and pyrolyzing the impregnated composite body; and subsequently crystallizing the densified ceramic composite body. The preceramic polymer composition comprises a preceramic polymer component, a crosslinker, and a catalyst.

The embodiment of the application relates to the battery field, and provides a battery monomer, a preparation method of the battery monomer, a battery device, a power utilization device and an energy storage device. The preparation method of the battery monomer comprises the process of preparing a composite diaphragm and the process of assembling the composite diaphragm, a positive electrode sheet and a negative electrode sheet, the composite diaphragm comprises a first film layer, a porous film layer and a second film layer which are stacked, and the process of preparing the composite diaphragm comprises the following steps: preparing a sol containing a carbon precursor polymer, a pore inducer and a crosslinking agent into a fiber film; the fiber film is heat-treated to obtain the porous film layer; the porous film layer is combined with the film layer to obtain the composite diaphragm. The embodiment of the application introduces the porous carbon nanofiber film on one side of the base film, achieves the purpose of promoting lithium precipitation reversibility, effectively controls and reduces lithium dendrite formation in the later stage of battery circulation, and avoids the technical effects of performance "dive" and potential short circuit risk of the battery cell.

The present invention relates to a method for producing a base polymer for photoresist, a pattern forming method, and a precursor polymer. The present invention is a method for producing a base polymer for photoresist, comprising the following steps: (1) preparing a precursor polymer containing a repeating unit (a') of an ammonium salt compound, a repeating unit (b') of a compound in which a hydrogen atom of a carboxylic acid is protected with an acid-labile group, and a repeating unit (c') of a compound in which a phenolic hydroxyl group is protected, (2) deprotecting the aforementioned repeating unit (c') and obtaining a deprotected precursor polymer, and (3) converting the ammonium salt of the aforementioned repeating unit (a') into a sulfonium salt or a sulfoxonium salt and obtaining a base polymer for photoresist. Thus, a method for producing a base polymer for photoresist, which is included in a chemically amplified resist composition that is excellent in solvent solubility, high sensitivity, high contrast, and lithography properties such as EL, LWR, CDU, DOF, and the like in optical lithography using high-energy rays, is provided.

The invention relates to a temperature-resistant optical fiber with a ceramic coating and a preparation method and system thereof, and the method comprises the following steps: coating a bare optical fiber with a silane coupling agent coating, and carrying out the curing of the silane coupling agent coating to form a chemical grafting transition layer, thereby obtaining a first optical fiber; the first optical fiber is coated with a flexible bonding coating, a flexible bonding pre-curing layer is formed through curing, and a second optical fiber is obtained; the flexible bonding coating comprises a first ceramic precursor polymer and a flexible adjusting component; coating a rigid protective coating on the second optical fiber, and curing to form a rigid protective pre-cured layer to obtain a first temperature-resistant optical fiber with a polymer-state coating; the rigid protective coating comprises a second ceramic precursor polymer and a modified reinforcing filler; the first temperature-resistant optical fiber can be subjected to off-line heat treatment to form a ceramic coating, and a second temperature-resistant optical fiber is obtained. According to the invention, the first temperature-resistant optical fiber which can resist the temperature of not more than 350 DEG C and the second temperature-resistant optical fiber which can resist the temperature of more than 600 DEG C can be obtained, and the coating processability and the high-temperature service performance can be effectively considered.

A method for the production of boron nitride fibre, the method comprising (i) providing an electrospinning solution comprising a precursor polymer, wherein the precursor polymer is an N-C1-6 alkyl or N,N-di(C1-6 alkyl) poly(aminoborane) having a molecular weight (MW) of at least 20,000 gmol-1; (ii) electrospinning the precursor polymer to provide precursor polymer fibres; (iii) curing the precursor polymer fibres to provide cured precursor polymer fibres; and (iv) thermolysis of the cured precursor polymer fibres in an ammonia-containing atmosphere.

The invention provides a composite material plate as well as a preparation method and application thereof, and relates to the technical field of advanced composite materials. The composite material plate is mainly composed of a hybrid resin matrix and a reinforced fiber body, and the hybrid resin matrix is mainly prepared from organic silicon resin, phenolic resin, a ceramic precursor polymer, a functional auxiliary agent and the like; through the design of a ternary hybrid resin matrix and the mixing of reinforced fiber bodies, the unification of extreme high temperature resistance and high structural strength is realized, so that the prepared composite material plate has ultrahigh fire resistance (1500 DEG C oxygen-acetylene flame 30 min +), high structural strength (the tensile strength is greater than or equal to 320 MPa, and the bending resistance is greater than or equal to 280 MPa) and good process adaptability; meanwhile, the composite material plate prepared by the invention also has relatively low density, realizes the unification of light weight and high structural strength, can replace a metal fireproof plate, is suitable for light-weight fireproof structural members such as a battery upper cover and a fireproof plate, and has important application value.

The invention belongs to the technical field of membrane preparation and application, and discloses a butadiene separation copolymer-based carbon molecular sieve membrane and a preparation method thereof. Through the design of a carbon molecular sieve membrane precursor polymer material, a diamine monomer containing trifluoromethyl and ether bonds at the same time is introduced into a polymer structure,-CF3 releases gas in the pyrolysis process, and a rich porous structure is formed in the membrane. -O-enables the precursor polymer to be looser, and meanwhile, pore-forming sites are introduced, so that formation of a rich pore network is further promoted. The permeability of C4H6 is improved, and the carbon molecular sieve membrane for C4H6 separation, which has high selectivity and high permeability, is developed.

The present application relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The present application aims to solve the technical problems of long preparation process period, poor structural uniformity and insufficient toughness of traditional CMC. The present application uses surface-modified alumina ceramic microspheres as reinforcing bodies, the surface of the microspheres is sequentially modified with hexagonal boron nitride nanosheets and metal nickel catalyst, and is mixed with silicon carbide nanoparticles and polycarbosilane precursor to form a slurry, and a complex component is formed by multi-material additive manufacturing. The present application uses a 3D printing technology combining photocuring and material extrusion to prepare a green body; the green body is then subjected to ultraviolet curing and heat treatment in an inert atmosphere in stages, so that the precursor polymer is crosslinked and solidified while the carbon nanowires are catalytically grown in situ; finally, sintering is carried out under pressure conditions to realize densification of the matrix. The present application greatly shortens the preparation period, and the obtained composite material has a uniform structure, a dense matrix and excellent mechanical properties.

This invention discloses a method for preparing modified high-strength and high-toughness polylactic acid (PLA), comprising: S1, mixing boric acid and hydroxyl silicone oil and then performing a polymerization reaction to obtain a precursor polymer matrix with a silky luster; S2, mixing the polymer matrix prepared in the above step with oleic acid, and performing a thorough blending and plasticizing reaction in a Hacker torque rheometer to obtain an SSG polymer with a dynamic B-O crosslinking structure; S3, melt-blending the SSG polymer prepared in the above step with PLA in a twin-cone screw extruder, and uniformly dispersing the mixture to obtain a PLA / SSG blend, i.e., the high-strength and high-toughness PLA exhibiting strain rate hardening energy absorption effect. According to this invention, it is possible to significantly improve the elongation at break and impact energy absorption of PLA with almost no reduction in its ultimate tensile strength, which has broad application prospects in the field of additive manufacturing.