120 results about "Bond formation" patented technology

The invention discloses a modified organic silicon resin, a high-temperature-resistant coating and a preparation method thereof, the modified organic silicon resin is prepared by hydrolyzing at least two different siloxane monomers and then carrying out condensation reaction on the hydrolyzed siloxane monomers and at least one boric acid monomer, and the main chain of the organic silicon resin is of a heteroatom doped structure formed by a Si-O bond, a B-O bond and a B-O-Si bond; at 200-250 DEG C, the modified organic-inorganic high-temperature-resistant composite material is subjected to a self-crosslinking reaction. The high-temperature-resistant coating overcomes the defect that the high-temperature-resistant coating in the prior art cannot meet the high-temperature test, and avoids the defects that organic and inorganic high-temperature-resistant coatings crack, the impact resistance and hardness are not matched, the water resistance is poor, and the wear resistance is poor.

Disclosed are methods of performing iterative N-C and C-C bond formation, methods of making compounds which enable iterative N-C and C-C bond formation, and compounds which enable iterative N-C and C-C bond formation.

A wire bonding apparatus (100) comprises: a supply (108) of bond wire (102); a first motor (114) to advance the bond wire (102) from the supply (108); a wedge (110) to perform wire bonding by forming a first bond and a second bond, the second bond separated by a distance from the first bond; a wire guide (104) adjacent the wedge (110) for guiding the bond wire (102) toward the wedge (110); and a second motor (118) to advance the bond wire (102) into the wire guide (104), the second motor (118) configured to feed a length of the bond wire (102) after formation of the first bond and before formation of the second bond, the length greater than the distance between the first and second bonds.

The invention relates to a hydrophobically modified aluminum oxide and polytetrafluoroethylene composite film as well as a preparation method and application thereof. According to the present invention, the aluminum oxide is firstly subjected to hydroxylation treatment, and then the surface of the aluminum oxide is subjected to hydrophobic treatment by using cyclosilazane, such that the Al-OH content of the prepared hydrophobic modified aluminum oxide surface is low, such that the water absorption rate of the aluminum oxide-PTFE composite film is low, and the aluminum oxide-PTFE composite film is not easily interfered by moisture, and has good electrical insulation performance. In addition, amino groups (-NH2) or imino groups (-NH-) are further introduced into the surface of the hydrophobic modified aluminum oxide and can form hydrogen-bond interaction with C-F bonds in PTFE, so that the compatibility of the hydrophobic modified aluminum oxide and the PTFE is improved, and the mechanical property of the aluminum oxide-PTFE composite film can still be kept under the condition of high addition amount of aluminum oxide.

The invention belongs to the technical field of adhesives, and particularly relates to a degradable mobile phone gum material and a preparation process thereof. The degradable mobile phone gum material is prepared from the following raw materials in parts by weight: 45 to 60 parts of bio-based methacrylate monomer, 5 to 10 parts of tackifying resin, 3 to 8 parts of vinyl ethoxyethyl acrylate, 3 to 8 parts of 4-hydroxybutyl acrylate, 2 to 5 parts of modified monomer A, 2 to 5 parts of modified monomer B, 0.1 to 2 parts of initiator and 60 to 80 parts of solvent, the modified monomer A contains a disulfide bond and a double bond; the modified monomer B contains a boric acid ester bond and a double bond. Dynamic disulfide bonds and boric acid ester bonds are introduced between polyacrylate molecular chains, the two dynamic bonds form a graded energy dissipation network, and the obtained degradable mobile phone back adhesive material is degradable and has an excellent creep recovery rate at the same time.

A method of forming a wire bond assembly includes wire bonding a first end of a first bond wire to a first conductive bonding surface arranged on a first substrate to form a first conductive bond formation; wire bonding a second end of the first bond wire to a second conductive bonding surface arranged on a second substrate to form a second conductive bond formation, wherein the second substrate; forming a conductive structure on top of the first conductive bond formation; wire bonding a first end of a second bond wire to a top of the conductive structure to form a third conductive bond formation; and wire bonding a second end of the second bond wire to the second conductive bonding surface to form a fourth conductive bond formation, wherein the fourth conductive bond formation is laterally separated from the second conductive bond formation on the second conductive bonding surface.

Disclosed herein are embodiments of a chiral Pd(0) precatalyst that exhibits bench-top and / or solution stability against degradation and / or oxidation. Also disclosed are method embodiments for making the Pd(0) precatalyst and methods for using the same in enantioselective chemical reactions, such as carbon-element bond formation.

The invention discloses a Zn / N co-doped porous soft and hard carbon composite negative electrode material and a preparation method thereof, and belongs to the technical field of secondary battery negative electrode materials. According to the method, bagasse is taken as a carbon source, asphalt is supplemented to regulate and control a carbon structure, a zinc source induces ion doping, micropore construction and Zn-NH2 bond formation, heteroatom doping is realized by a nitrogen source, and the hard carbon material with high N doping efficiency and a hierarchical porous structure is constructed through a doping-pore forming-stabilizing three-in-one cooperative regulation and control strategy. Through the integrated design of Zn induced doping stability, structure regulation and interface optimization, a new thought and a technical path are provided for developing a high-performance sodium ion battery negative electrode material.

The invention discloses a surface-enhanced Raman probe as well as preparation and application thereof. The surface-enhanced Raman probe comprises a silver nanorod and a 4-amino thiophenol molecular layer adsorbed on the surface of the silver nanorod, pATP molecules and the surface of the silver nanorod form an Ag-S bond through sulfydryl (-SH) to form AgNRs (at) PATP, the two AgNRs (at) PATP molecules easily form a corresponding azo compound DMAB, and a pi-pi conjugated structure between the DMAB and nitro explosive molecules can effectively promote electron transfer, combine into AgNRs (at) PATP (at) TNT and generate a hot spot signal, so that a Raman signal is enhanced, the detection limit is reduced, the accuracy is high, and the method is suitable for industrial production. The trace detection of the nitro explosives is realized.

The invention discloses a sealing material for doors and windows, and relates to the technical field of sealing materials, the sealing material is composed of a biomass polyester elastomer, three-stage core-shell state nanometer SiO2, vulcanized rubber, a plasticizer, a dispersant and a functional auxiliary agent; wherein the three-stage shell-core state nano SiO2 comprises a mesoporous nano SiO2 core, perfluoropolyether silane, an interwoven network layer formed by C = N bonds and C18-QAS, the interwoven network layer and the C18-QAS are sequentially coated outside the mesoporous nano SiO2 core, and a fluorine chain layer formed by the perfluoropolyether silane not only has a hydrophobic effect, but also can form space matching with the interwoven network layer formed by the C = N bonds, so that stress concentration is avoided; meanwhile, the C = N bond is reversibly fractured or recombined under stress, so that energy between the nano-particles and the cross section of the matrix is dissipated, and the fracture performance is improved; the quaternary ammonium salt cations of C18-QAS and carboxyl contained in the middle shell generate electrostatic attraction, so that the polymerization direction of the outer shell is perpendicular to the surface of the inner core, a nanoscale groove structure is formed, and cross-interface permeation of water molecules is efficiently inhibited.

According to the efficient synthesis method of the alpha-carbonyl spiro compound, aryl bromide is used as a substrate, benzene-1, 3, 5-triformic acid triester is used as a safe and green carbonyl source, palladium is used as a catalyst, organic phosphine is used as a ligand, and 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU) is used as alkali, so that the amide-containing bis-heterocyclic compound is successfully synthesized. The method adopts a one-pot method, and has the characteristics of greenness, safety, simplicity in operation, wide substrate range, good functional group compatibility, high bonding efficiency and the like. The product alpha-carbonyl spiro compound is an important intermediate for synthesizing complex molecules such as drugs and natural products, and the method has important significance in the fields of medicines, pesticides, chemical engineering and the like.

The invention discloses a copper porphyrin conjugated acetylene polymer composite material, a preparation method and application of the copper porphyrin conjugated acetylene polymer composite material in biological mercaptan photoelectric detection, the composite material comprises an electrochemical reduction graphene oxide layer, a poly (1, 4-diacetylene benzene) layer and a copper porphyrin conjugated acetylene copolymer layer, and the three layers form a layered composite structure through pi-pi interaction. The copper porphyrin conjugated acetylene copolymer is formed by copolymerization of a 1, 4-diacetylene benzene monomer and a copper-coordinated 5, 10, 15, 20-tetra (4-acetylene phenyl) porphyrin monomer through a Sonogashira coupling reaction, and the composite material utilizes a double recognition site mechanism that a Cu-S coordinate bond is formed by a porphyrin center and sulfydryl and an acetylene bond and the sulfydryl are subjected to a click reaction under illumination. The high-sensitivity and high-selectivity detection on the L-cysteine and the reduced glutathione is realized, and the detection limit on the L-cysteine can reach 2.3 mu M.

The present disclosure provides engineered carboxyesterase enzymes that have the ability to catalyze amide bond formation. Also provided are polynucleotides encoding the carboxyesterase enzymes, host cells capable of expressing the engineered carboxyesterase enzymes, and methods of using the engineered carboxyesterase enzymes to make commercially valuable amides. Also provided are amides that are made using the engineered carboxyesterase enzymes.

This invention relates to a g-C3N4@NiS composite photoelectrocatalyst and its preparation and application. The catalyst has a flower-like hierarchical porous structure, composed of g-C3N4 nanospheres and NiS nanoparticles supported thereon. The g-C3N4 nanospheres are assembled from stacked nanosheet layers. The NiS nanoparticles and g-C3N4 nanospheres form an in-situ covalently bonded heterojunction through Ni-S and Ni-N bonds, constructing a p-n heterostructure. The preparation method involves mixing melamine, glucose, CTAC, nickel acetate, and thiourea, and simultaneously achieving the condensation polymerization of g-C3N4 and the growth of NiS using a low-temperature one-pot hydrothermal method. Under alkaline conditions, the HER overpotential of this catalyst is only -2 mV at 10 mA cm⁻¹. ‑2 The overpotential of OER is 270 mV at 10 mA cm⁻¹. ‑2 In the dual-electrode total water splitting system, only 2.4 V is required to achieve 20 mA cm⁻¹. ‑2 It achieves a high current density and operates stably for over 24 hours, exhibiting excellent catalytic activity and stability in seawater. This invention boasts advantages such as a simple synthesis process, strong interfacial coupling, superior catalytic performance, and resistance to seawater corrosion.

A method for forming a direct hybrid bond and a device resulting from a direct hybrid bond including a first substrate having a first set of metallic bonding pads, preferably connected to a device or circuit, capped by a conductive barrier, and having a first non-metallic region adjacent to the metallic bonding pads on the first substrate, a second substrate having a second set of metallic bonding pads capped by a second conductive barrier, aligned with the first set of metallic bonding pads, preferably connected to a device or circuit, and having a second non-metallic region adjacent to the metallic bonding pads on the second substrate, and a contact-bonded interface between the first and second set of metallic bonding pads capped by conductive barriers formed by contact bonding of the first non-metallic region to the second non-metallic region.

The invention discloses a method for preparing a hydrophobic coating on an electroplated chromium surface, which comprises the following steps: adding dispersion liquid of nano particles into chromium plating liquid to obtain composite chromium plating liquid, and electroplating a workpiece by using the composite chromium plating liquid to obtain a chromium plating layer, the nano particles are at least one of silicon dioxide, silicon carbide or silicon nitride, silica sol and silicon-fluorine-containing resin are sequentially applied to the chromium plating layer, and the hydrophobic coating is obtained after drying. According to the invention, the nano particles are doped with the electroplated chromium, the chromium plating layer contains Si, so that Si-OH bonds are formed on the surface of the electroplated chromium, silica sol is used as a silicon transition layer, the lower part of the silica sol can form Si-O-Si chemical bonds with Si-OH in the chromium plating layer, and the upper part of the silica sol can form Si-O-Si chemical bonds with Si-OH bonds in silicon-containing fluorine resin; and the binding force of the hydrophobic coating and the chromium plating layer is greatly improved.

The invention discloses antibacterial titanium dioxide with high temperature resistance and a preparation method. The titanium dioxide comprises a titanium dioxide base material, an inorganic coating layer coating the surface of the titanium dioxide base material and an organic coating layer coating the surface of the inorganic coating layer, the inorganic coating layer comprises a nano-silver film layer; the organic coating layer is a coating layer formed by introducing Ti-S bonds. The titanium dioxide is subjected to inorganic coating and organic modification treatment in sequence. A high-dispersion nano-silver film layer and a Ti-S bond are introduced, so that the titanium dioxide has excellent antibacterial property and temperature resistance, and the use requirements of the plastic industry are met.

According to the efficient synthesis method of the amide-containing diheterocyclic compound, aryl iodide is used as a substrate, molybdenum hexacarbonyl is used as a safe carbonyl source, palladium is used as a catalyst, organic phosphine is used as a ligand, potassium carbonate is used as alkali, and indole is used as a nucleophilic reagent, so that the amide-containing diheterocyclic compound is successfully synthesized. The method adopts a one-pot method, and has the characteristics of safety and simplicity in operation, wide substrate range, good functional group compatibility, high bonding efficiency and the like. The amide-containing bis-heterocyclic compound is an important intermediate for synthesizing complex molecules such as drugs and natural products, and the method has important significance in the fields of medicines, pesticides, chemical engineering and the like.

The invention discloses a chiral oxazoline ligand containing an indole skeleton as well as a synthesis method and application of the chiral oxazoline ligand. The chiral ligand has a structure as shown in a formula 1, and R1 is selected from one of alkyl, substituted alkyl, aryl and substituted aryl. The chiral oxazoline ligand of the indole skeleton can realize high-enantioselectivity Friedel-Crafts reaction of an indole skeleton compound, the reaction is one of important carbon-carbon bond forming methods in organic synthesis, and a chiral indole derivative can be efficiently generated; the chiral indole derivative has important application in synthesis of natural products and bioactive compounds. In addition, raw materials used for preparing the compound are cheap and easy to obtain, the synthesis route is short, the related reaction is a basic organic chemical reaction, the process is simple and convenient, the product is easy to separate and purify, and the method is suitable for large-scale synthesis.

This invention relates to an electron beam co-cured epoxy resin composite material with sustained-release function, its preparation method, and its application. The raw materials for this composite material include 40-60% epoxy resin, 10-20% polydimethylsiloxane, 9-15% epoxy acrylate, 5-10% amine curing agent, 2-8% inorganic nanofiller, 3-7% functionalized composite sustained-release material, 3-6% organotin catalyst, and 10-30% diluent. The coating prepared based on this material has an epoxy resin-based three-dimensional network structure, with inorganic nanofiller and functionalized composite sustained-release material uniformly dispersed within it. This three-dimensional network structure is formed by the cross-linking of the amine curing agent and epoxy resin to form a basic network. Electron beam irradiation causes the epoxy acrylate to generate highly active free radicals, which act on unreacted epoxy groups and the active sites of polydimethylsiloxane, promoting the formation of Si-O-C covalent bonds and C-O-C ether bonds and increasing the cross-linking density. This invention does not require fluorine-containing substances and possesses low surface energy, high mechanical strength, strong adhesion, and antibacterial properties.

The invention provides a tissue adhesive material as well as a preparation method and application thereof. The tissue bonding material is prepared from the following raw materials: a polymer monomer, wherein the polymer monomer comprises an acrylic monomer and an acrylamide monomer; the modified chitosan compound is obtained by modifying a chitosan compound through a polyphenol compound, and the polyphenol compound has two or more phenolic hydroxyl groups; and an initiator, wherein the initiator comprises a photoinitiator and a radical initiator. When the tissue bonding material is in contact with a wet or wet tissue surface, interface liquid existing between the bonding material and the wet tissue surface can be quickly absorbed and removed, and carboxyl, amido and catechol groups of the tissue bonding material can form a large number of molecular bonds with molecules on the wet tissue surface, so that instant bonding on the wet tissue surface is formed; and high adhesiveness can be maintained for a long time.

There are many benefits to organometallic catalysis, especially in homogeneous catalysis for C(sp2)-H bond activation and new C-C bond formation reactions. These catalysts, which are mainly transition metal complexes with organic ligands, are very reactive and selective, which increases the range and effectiveness of different synthetic transformations. Their capacity to activate C-H bonds under mild reaction conditions is a key advantage as it allows for the direct C-H alkylation of aryl ketones without the need for transient functional groups. This reduces utilization of chemicals, cost and energy used in addition to streamlining synthetic routes. Furthermore, complex molecular architectures with high stereo- and regioselectivity may be formed with the help of organometallic homogenous catalysts, making precise synthesis of complex molecules possible. The present catalyst is easy to use, industrially scalable, recyclable, and provides excellent yields of C-H alkylated products from nonactivated alkyl halides. The reported methods need the use of excess (2-6 equivalent) of alkyl halides but this catalyst performs the catalytic reaction in the stoichiometric quantities of aryl ketone and alkyl halides.

The invention relates to a method for preparing a two-dimensional polymerization fullerene film through vapor deposition, and belongs to the technical field of two-dimensional materials. According to the method, a vapor deposition method is adopted, firstly, gaseous fullerene molecules are reduced, bonding among the fullerene molecules is induced, ordered covalent connection is formed, and therefore the two-dimensional polymerization fullerene film is directly obtained on a substrate. The two-dimensional polymerized fullerene film is directly synthesized in a vapor deposition mode, and the method is simple, high in efficiency and large in area. Compared with a traditional stripping mode, the method has the advantage that the two-dimensional polymerized fullerene film is directly synthesized on the surface of the substrate.

The invention belongs to the technical field of biomedical materials and tissue engineering, and particularly relates to a self-pumping stent material with a double-layer heterogeneous structure as well as a preparation method and application of the self-pumping stent material. A hydrophobic membrane is prepared by an electrostatic spinning technology, and a hydrophilic microgel assembly is prepared by an emulsion method. Adding a dopamine modified polymer, and establishing a dynamic phenylboronic acid ester bond between microgel through a dopamine group to form a hydrophilic microgel assembly; the adhesion connection of the microgel assembly and the hydrophobic membrane is realized through mussel bionic chemical reaction of dopamine groups, and a double-layer heterogeneous structure based on the hydrophilic assembly and the hydrophobic membrane is constructed, so that a self-pumping effect is generated, and one-way flow of liquid components from the hydrophobic side of the stent to the hydrophilic side of the stent can be realized. Implanting the stent into an alveolar bone defect wherein the hydrophobic membrane contacts gingiva and the hydrophilic microgel assembly fills the bone defect; through the self-pumping effect of the stent, nutritional ingredients in the gingiva are unidirectionally pumped to the defect part of the alveolar bone, so that the regeneration of the alveolar bone is promoted.

The application relates to the paint technology field and discloses a high-temperature-resistant paint and a preparation method thereof. Epoxy resin, a filler, a dispersing agent and a defoaming agent are added into a solvent, a curing agent is added after stirring, and the high-temperature-resistant paint is obtained. The curing agent is composed of a polyamide curing agent and UPy diamino diphenyl sulfone; UPy structure forms stable quadruple hydrogen bond action in the molecular chain bond of the epoxy resin, the crosslinking density of the epoxy resin is improved, when the epoxy resin is stressed, the quadruple hydrogen bond can be broken by absorbing energy at the same time, stress can be consumed and energy can be transmitted, the paint curing product is not damaged by stress, has good toughening effect, and the toughness of the paint film is improved. The heat-resistant diphenyl sulfone structure is introduced into the molecular chain of the epoxy resin, the high-temperature-resistant performance of the paint is improved, and the paint has higher thermal decomposition temperature.

The present invention provides a novel monomer, which provides a new functionality by including a novel monomer formed by a bond between a pentagonal cyclic olefin molecule and a photosensitive molecule, may control mechanical and thermal properties, and is formed by a bond between Chemical Formula 1 and any one of Chemical Formulae 2 to 4 in order to perform chemical recycling through reversible chemical changes according to the external stimulus.

The application discloses a kind of hydrophilic rubber and its preparation method and application, the hydrophilic rubber includes modified rubber, and the surface of the modified rubber is covered with hydrophilic polymer coating;The modified rubber is prepared by the following steps: isoprene rubber or natural rubber is treated with epoxidation reagent and strong oxidant.The modified rubber and hydrophilic polymer coating are covalently grafted by hydrogen bond complexation or by ester bond, ether bond, wherein the hydrogen bond is not easily destroyed by small molecule solvent by hydrophilic polymer coating, and hydrogen bond is conducive to improving the stability of hydrophilic coating, and cooperatively makes rubber keep hydrophilic lubricity.The hydrophilic rubber of the application has good biocompatibility, and has no irritation to skin.The hydrophilic rubber of the application can be applied to self-lubricating condom, and the surface coating of condom can greatly reduce the friction coefficient after being contacted with water, aqueous solution or body fluid.

The application relates to the technical field of organic synthesis, in particular to a synthesis method for forming carbon-carbon bonds under palladium catalysis, which comprises the following steps: mixing an olefin derivative and an iodine-substituted aromatic compound to form a mixed reaction system, and reacting under the catalysis of a palladium catalyst and ultrasonic conditions to obtain an aromatic hydrocarbon compound. The synthesis method effectively avoids the use of a solvent, and has the advantages of mild reaction conditions, low reaction temperature and simple post-treatment process.

The present application relates to a kind of degradable PA6 composite modified plastics, belong to composite material technical field;The present application is by preparing a modifier with double bond in structure, and using the modifier to modify PBAT, effectively solve the uneven distribution problem of polar additive in PBAT-PA6 composite plastics, and provide good antibacterial performance and ultraviolet light aging resistance for composite plastics, in addition, the modifier of the present application can also improve the polarity of modified PBAT, and using the ionic-dipole interaction of quaternary ammonium salt structure in structure and the polar amide bond in PA6 is formed, the adhesion between modified PBAT phase and PA6 phase is enhanced, the compatibility between modified PBAT and PA6 is improved, and then the mechanical properties of PBAT-PA6 composite plastics as a whole is improved.