25 results about "Polymer free" patented technology

The invention belongs to the technical field of two-dimensional materials, and particularly relates to a preparation method of a corner heterojunction. According to the preparation method, when the two-dimensional material sheet is prepared, based on the characteristics of smooth surface and high viscosity of the hydrophilic polymer layer, a large-area two-dimensional material can be stripped from the silicon substrate with the hydrophilic polymer film layer, the stripping process is clean, and the two-dimensional material is not damaged; when the corner heterojunction is prepared, an intermediate two-dimensional material or an active interface does not contact any polymer in the whole transfer process by adjusting the shape and size of a transfer medium based on a Van der Waals force pickup transfer method, so that the pollution of a heterogeneous interface is greatly reduced; the efficient and fast preparation of the Van der Waals heterostructure without polymer residues and bubbles on the interface is realized.

The present disclosure is directed polymer-free, non-composite densified carbon nanotube (DCN) structures from thin carbon nanotube (CNT) films and methods of making the same. CNT thin films can be cut, folded, stacked and pre-arranged in the form of cylinders, discs, domes, frames, gaskets, jars, rings, sacks, seals and sheets on a smooth reaction vessel surface and subsequently densified with the use of chlorosulfonic acid (HClSO3) at elevated temperatures. The disclosed DCN structures can be used as EMI shielding, lightweight structural and functional components in extreme conditions commonly encountered in space exploration, polar expeditions and military operations, and also as hydrophilic filtration media that resist surface fouling and provide high flux.

The invention discloses a preparation method of a branched polybenzimidazole side chain grafted monovalent / divalent high-selectivity cationic membrane, which is characterized in that a branched unit is introduced into a main chain to construct a microcavity structure based on the unique tight stacking and rich hydrogen bond network characteristics of polybenzimidazole (PBI), and the pore diameter in the membrane and the free volume of a polymer are regulated and controlled to prepare the branched polybenzimidazole side chain grafted monovalent / divalent high-selectivity cationic membrane. The stable and rapid transmission of monovalent ions is promoted, and a high interception effect on divalent ions is kept. Then molecules containing sulfonic acid groups and hydrophobic side chain molecules are grafted to the branched PBI, the ionic conduction performance is improved, meanwhile, a microphase separation structure can be constructed, the ionic transmembrane energy barrier difference is increased through the ionic hydration energy difference of monovalent and divalent ions, selective transmission of ions is achieved, and the ionic conductivity is improved. Finally, the ion separation membrane with outstanding stability and excellent comprehensive performance of selectivity and flux is obtained.

The invention provides an ethylene non-selective oligomerization catalyst. The catalyst can be matched with co-catalysts such as alkyl aluminum and alkoxy aluminum which are commonly used for oligomerization to form a catalyst system, and ethylene is catalyzed to be subjected to oligomerization reaction. Due to the special steric hindrance effect of the tetrahedral center structure of the catalyst molecule, the stability of the active center can be protected during ethylene non-selective oligomerization, and the service life and the activity of the catalyst are improved; more importantly, the space structure can effectively limit the growth of an active ethylene chain, so that the repetitive unit of the active ethylene chain is controlled within a certain range, the formation of a long carbon chain is avoided, and the effective gain effects are that the generation of oligomerization wax components is reduced, the content of short-chain alpha-olefin is increased, and the generation of high-molecular-weight PE is prevented. The catalyst with high activity, high selectivity and no polymer generation has high industrial application value in the field of ethylene non-selective oligomerization.

The invention belongs to the field of integrated circuit electronic chemicals, and particularly relates to an etching solution for removing a polycrystalline silicon false gate, which mainly comprises quaternary ammonium hydroxide, alcohol, an organic solvent, an anisotropic etching weakening additive and water. The etching liquid is mainly used for removing polycrystalline silicon false gates in the semiconductor manufacturing process, and the liquid medicine has certain organic polymer cleaning capacity and can synchronize polymer residues formed after dry etching. After being treated by the liquid medicine, no polymer or polycrystalline silicon is left on the surface of the structure, and the liquid medicine has high stability and long service life.

The application discloses a method for preparing intrinsic carbon nanotube arrays based on degradable polymers and microfluidic channels. A conjugated polymer containing degradable groups is used to separate and prepare a high-purity semiconductor carbon nanotube solution, and based on the solution, a microfluidic two-phase limited self-assembly method is used to simultaneously prepare high-density carbon nanotube arrays on two substrates. Subsequently, a weak acid solvent is used to decompose the degradable polymer wrapped on the surface of the carbon nanotube into small molecules, and through subsequent cleaning, annealing and other processes, the degradable polymer is completely removed from the surface of the carbon nanotube, so that the intrinsic carbon nanotube arrays with high semiconductor purity, high density and no polymer wrapping on the surface are obtained. The method lays a material foundation for realizing the ultimate performance of the carbon nanotube, and is favorable for early application of carbon nanotube electronic technology.

Disclosed is system of reducing laser speckle contrast, the system has a laser light source arranged to emit laser light; an illumination target arranged to receive the emitted laser light; a speckle reducer on an optical path between the laser light source and the illumination target, the speckle reducer having one or more optical diffuser elements with a polymer free cholesteric liquid crystal medium; a voltage source connected to the one or more optical diffuser elements; and a controller operatively connected to the laser light source and the voltage source, wherein the controller is configured to apply and remove a driving voltage Vd to the one or more optical diffuser elements to toggle the one or more optical diffuser elements between a diffusing state and a non-diffusing state.

A filter medium for an air filter is composed of a wet-laid nonwoven fabric containing a glass fiber having a fiber diameter of less than 1 μm. The wet-laid nonwoven fabric contains a water repellent containing, as a main component, a hydrocarbon-based polymer free of fluorine and silicon in a molecule thereof, and does not contain a binder resin.

This application relates generally to the field of implants and more specifically to drug eluting vascular stents and methods of making and using same. Specifically, this technology relates to controlled release of drug from an implant and particular from a stent without the presence of polymer or alteration of the implant surface.

A method of connecting an optical element to a mount includes attaching a connector to an optical element with a first solder and heating the first solder with an ultrasonic heater to form a first solder joint between the connector and the optical element; aligning the optical element in the internal opening of the mounting seat; and attaching the connector to the mount with a second joint, wherein the first solder joint is a polymer-free joint.

The application discloses a data encryption and anti-counterfeiting method based on polymer free volume change. The data encryption method comprises the following steps: preparing a polymer film containing encrypted information through photopolymerization, using a reverse rigidochromic fluorescent molecular probe as a developer to decrypt the polymer film containing encrypted information, and reading information. Compared with existing encryption and anti-counterfeiting technologies, the data encryption and anti-counterfeiting technology based on polymer free volume change has the same element composition and elastic modulus in the information area and the background area, greatly reduces the risk of cracking data by using advanced instruments, and the multidimensional change of the pattern is not easy to be tampered with, and the method is suitable for the field of encryption and anti-counterfeiting technologies.

A method for connecting an optical element to a mount, the method including: attaching a connector to the optical element with a first solder and heating the first solder with an ultrasonic heater to form a first soldered joint between the connector and the optical element; aligning the optical element within an inner opening of the mount; and attaching the connector to the mount with a second joint, wherein the first soldered joint is a polymer-free joint.

The invention discloses a high-hygroscopicity ionic polymer material as well as a preparation method and application thereof. The high-hygroscopicity ionic polymer material is prepared by polymerizing a hygroscopicity ionic liquid monomer and a chain polymer free radical and then adjusting the aperture. The high-hygroscopicity ionic polymer material can reach 1.65 g / g in moisture absorption within 12 hours at the normal temperature under the humidity of 90%. The hygroscopic ionic polymer has an adjustable porous structure and high-density hygroscopic ions in structure, has high hygroscopicity and good machinability in performance, and can be widely applied to the aspects of drying, dehumidification, adsorption and heat storage, seawater desalination, sewage treatment and the like.

A system and methods for additively manufacturing energetic particles such as polymer-free nanothermite aerogels are provided. An ink containing graphene oxide (GO), Al, and Bi2O3 nanoparticles in propylene carbonate is prepared. The method includes in-situ reduction of graphene oxide (GO), by ethylenediamine, during extrusion and printing of the ink onto a substrate with a simple printing system. The printed aerogels include reduced GO as a porous scaffold for the aerogel with Al and Bi2O3 clusters embedded therein. The linear burning rate of the printed aerogels reached a higher rate (10 m / s) that reported for typical polymer-assisted 3D printed nanothermite products. Also provided is a framework for optimizing a nanothermite fuel grain structure to match a desired combustion profile. The framework was used to model optimal fuel layer thicknesses, radii and bum rates for simple thrust, complex thrust and pressure matching cases.

Hard surface, namely floor coating compositions free of fluoro-surfactants and free of zinc cross-link agents are disclosed. More particularly, hard surface, namely floor coating compositions containing an organic polymer comprising (i) styrene or vinyl toluene and at least one monoethylenically unsaturated acid or anhydride, (ii) acrylic polymers or modified acrylic polymers, or (iii) combinations thereof as the floor coating material with a plasticizing agent, solvent and / or a coalescent and / or cosolvent, without the use of zinc cross-link agents and fluoro-surfactants are disclosed. The aqueous compositions and methods of use provide desired floor coating characteristics with enhanced sustainability profiles.

The application provides an ethylene non-selective oligomerization catalyst. The catalyst can be matched with an alkyl aluminum, an alkoxy aluminum and other cocatalysts commonly used in oligomerization to form a catalyst system, which catalyzes the oligomerization of ethylene. Due to the special steric hindrance effect of the tetrahedral center structure of the catalyst molecule, the stability of the active center can be protected during the non-selective oligomerization of ethylene, and the catalyst life and activity are improved. More importantly, the space structure can effectively limit the growth of active ethylene chains, so as to control the repeating units of the active ethylene chains within a certain range, avoid the formation of long carbon chains, and effectively reduce the generation of oligomeric waxy components, improve the content of short-chain alpha-olefins and prevent the generation of high molecular weight PE. The catalyst with high activity, high selectivity and no polymer generation has high industrial application value in the field of non-selective oligomerization of ethylene.

A method of connecting an optical element to a mount, the method including attaching a connector to an optical element with a first solder and heating the first solder with an ultrasonic heater to form a first soldering bond between the connector and the optical element, aligning the optical element within an inner opening of a mount, and attaching the connector to the mount with a second bond, wherein the first soldering bond is a polymer-free bond.

The application discloses a method for removing terminal thioester groups of a polymer, which comprises the following steps: providing a polymer, the terminal of which contains thioester groups; mixing the polymer, an organic solvent, a free radical initiator and a metal organic additive, and fully reacting to remove the terminal thioester groups of the polymer, wherein the metal organic additive is a hydrogenated metal organic compound. The method for removing terminal thioester groups of a polymer in the application is based on the traditional free radical coupling method for removing the terminal thioester groups of a polymer, and a metal organic additive with excellent hydrogen atom providing capacity is added to the system; the metal organic additive can effectively and rapidly combine with the polymer free radicals generated after the removal of thioester, thereby avoiding the broadening of the molecular weight distribution of the polymer caused by the coupling termination of the polymer free radicals, and ensuring that the molecular weight distribution of the polymer remains unchanged while removing the terminal thioester groups of the polymer.

The present invention discloses an adhesive composition for battery separators, a slurry, a separator and a lithium-ion battery. An adhesive composition for battery separators, comprising polymer microspheres and a modifier, wherein the modifier is a microsphere surface polymer free volume modifier; the polymer microspheres contain an affinity monomer. The present invention prepares a polymer microsphere particle dispersion liquid with uniform particle size and surface modification, i.e., an adhesive composition, by using the affinity monomer in the polymer microspheres and the affinity surface polymer free volume modifier, further improving the adhesion between the particle coating film and the pole piece in dry and wet states, solving the technical problems in the prior art that it is impossible to take into account both strong adhesion in dry and wet states, and the winding coating film is easy to stick and easy to lose powder.

A polymer-free fluid may be used to delay reaction of hydrofluoric acid with a subterranean formation. The fluid contains an organic compound having a bifunctional group, HF or a HF-generating compound, urea and an organophosphonate.

The application belongs to the technical field of hydrogel microneedles, and relates to a hydrogel microneedle and a preparation method thereof, and the preparation method comprises the following steps: placing a methacrylated chitosan solution in a centrifugal tube, adding a photoinitiator, vortexing and ultrasonicating until the photoinitiator is completely dissolved to obtain a hydrogel microneedle filling solution; and taking the hydrogel microneedle filling solution and injecting the hydrogel microneedle filling solution into a PDMS microneedle mold, centrifuging, irradiating with an ultraviolet lamp and drying.The hydrogel microneedle prepared from methacrylated chitosan has superior performance in wound closure, re-epithelialization and hair follicle formation, and the hydrogel microneedle is combined with a rhodioside drug depot to construct a transdermal drug delivery system, the drug delivery system has high drug loading and no polymer deposition, can efficiently transdermally deliver rhodioside, promotes wound closure and tissue remodeling, and provides a potential strategy for wound treatment.

The application relates to an insulating material with high dielectric constant, a transistor and a preparation method thereof, which adopts high-purity MoO3 powder, and a MoO3 thin layer is grown on a SiO2 / Si substrate by a physical vapor deposition process; the MoO3 powder is placed in an alumina boat; the substrate is inverted on the alumina boat, and then the alumina boat is placed in the heating center of a single-temperature-zone tubular furnace; the tubular furnace is vacuumized, heated to a target temperature under vacuum, argon is introduced after the target temperature is reached, and the argon is kept for a certain time; the argon is turned off after the heat preservation is finished, the furnace is naturally cooled, and a MoO3 thin layer which stands on the substrate is obtained; the material has the characteristics of high dielectric constant, ultra-thin equivalent oxide thickness and the like, a transistor is obtained through a polymer-free transfer method, the cleanliness of a device manufacturing contact surface is protected, the electrical performance is greatly improved, the structural stability of the material is maintained, and the device shows excellent transfer characteristics.

The invention discloses a topological chemical conversion growth method and application of a two-dimensional vertical growth rare earth material Eu2SO2, and belongs to the technical field of two-dimensional rare earth materials and magnetic materials. Europium powder and sulfur powder are used for preparing a two-dimensional rare earth material, vertically growing Eu2O3 is generated from the europium powder and oxygen at a high temperature, an ideal topological framework is provided for Eu2SO2, topological chemical spontaneous reaction is carried out after the sulfur powder is introduced, and the vertically growing Eu2SO2 single crystal with high quality is synthesized. The stress effect applied to Eu2SO2 by the sapphire substrate step is effectively reduced by the vertical growth state, and polymer-free transfer is realized. The preparation method provided by the invention is high in controllability, the problems of pollution and defects caused by introduction of impurities and strain in the transfer process can be well solved, and the high-quality two-dimensional rare earth material with intrinsic performance can be obtained.

Hard surface, namely floor coating compositions free of fluoro-surfactants and free of zinc cross-link agents are disclosed. More particularly, hard surface, namely floor coating compositions containing an organic polymer comprising (i) styrene or vinyl toluene and at least one monoethylenically unsaturated acid or anhydride, (ii) acrylic polymers or modified acrylic polymers, or (iii) combinations thereof as the floor coating material with a plasticizing agent, solvent and / or a coalescent and / or cosolvent, without the use of zinc cross-link agents and fluoro-surfactants are disclosed. The aqueous compositions and methods of use provide desired floor coating characteristics with enhanced sustainability profiles.

Concentrated dispersions of silver nanowires are used to produce different quality silver structures having a range of properties. The concentrated dispersion may have a high weight percent of silver nanowires and may be formulated as a flowable liquid or a non-flowable paste. The concentrated dispersion may remain stable without visible settling during a week, may have a non-Newtonian rheology, and may be diluted to a desired weight percent of silver nanowires without adversely affecting the uniformity of the dispersion. The concentrated dispersions may be formulated with or without polymer or prepolymer components. The concentrated dispersion may be formulated with a silver salt to modulate the dispersion of the silver nanowires and improve the conductivity of the cured silver structure formed from the dispersion. The method of forming a concentrated dispersion is set forth as a method of forming a silver structure from the dispersion.