126 results about "Phase transition temperature" patented technology

The invention discloses a composite thermochromic window with a dual-band dynamic regulation and control function. The composite thermochromic window comprises a first transparent substrate, a tungsten-doped vanadium dioxide film, a second transparent substrate and a hydrogel layer. The tungsten-doped vanadium dioxide film is deposited on the upper surface of the first transparent substrate, and the phase transition temperature is 25-32 DEG C; the hydrogel layer is thermo-sensitive poly (N-isopropylacrylamide) and is encapsulated between the two transparent substrates, and the low critical phase transition temperature is 32 + / -2 DEG C. When the temperature is lower than 25 DEG C, the infrared transmittance of the tungsten-doped vanadium dioxide film is larger than or equal to 75%, and the visible light scattering rate of the hydrogel layer is smaller than or equal to 10%; when the temperature is higher than 32 DEG C, the near-infrared transmittance of the tungsten-doped vanadium dioxide film is reduced to the minimum value, and the visible light scattering rate of the hydrogel layer is increased to 35% or above. Compared with the prior art, the system and the method have the advantages that dual-band dynamic regulation and control of visible light and near-infrared light are achieved, the indoor photo-thermal environment can be automatically regulated according to the environment temperature, and the building energy utilization efficiency is improved.

The invention relates to the technical field of oil and gas reservoir exploitation equipment, in particular to a compression type metal packer which is used for solving the problem that a high-temperature and high-pressure deep well rubber cylinder serving as a sealing element cannot meet operation requirements, and the compression type metal packer comprises a first connector and a second connector which are connected to the upper end and the lower end of a central pipe; a sealing mechanism is arranged in the middle of the central pipe and comprises a metal sealing cylinder, a sealing ring and a sealing ring; the upper sealing cone sleeves the central pipe and is arranged at the upper part of the metal sealing cylinder; the lower sealing cone sleeves the central pipe and is arranged at the lower part of the metal sealing cylinder; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy, annealing treatment is conducted at the temperature of 650 DEG C, thermal circulation and mechanical training are conducted at the temperature above the phase change temperature, the stable mechanical performance is obtained, the ideal deformation rate can be obtained under the small load effect, the setting force and the unsetting force are reduced, and the metal sealing cylinder is suitable for high-temperature and high-pressure deep well operation.

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

The invention relates to the technical field of computational material science, in particular to a high-entropy ceramic phase change strengthened silver-based electric contact material component screening method, which comprises the following steps of: firstly, based on first principle calculation and Monte Carlo molecular dynamics simulation, combining experimental data correction, and screening out a (MgCoNiCuZn) O component proportion of which the phase change temperature is close to a silver melting point and the single-phase enthalpy value is high; secondly, dynamically simulating wetting behaviors of liquid silver and O with different component proportions (MgCoNiCuZn) through molecular dynamics, and selecting a component proportion with the best wettability with the liquid silver in combination with phase boundary energy calculation and wetting angle experimental verification; and finally, preparing a sample based on spark plasma sintering, actually measuring a wetting angle by using a seat drop method, and feeding back and correcting simulation parameters to form closed-loop optimization. The method is suitable for wettability collaborative optimization screening of a rare earth element doped high-entropy oxide system and liquid metal, proper components can be efficiently and accurately screened out, and the performance of the silver-based electric contact material is improved.

The invention discloses a method for increasing the phase transition temperature of Al2O3 aerogel through grain boundary pinning and nano-structure strengthening, which comprises the following steps: co-hydrolyzing an aluminum source, yttrium salt, a silicon source and magnesium salt to form sol through the coordination of double mechanisms of grain boundary pinning and nano-domain isolation, and carrying out gradient heating aging, mixed medium supercritical drying and two-stage sintering to obtain the phase transition temperature of the Al2O3 aerogel. The gamma-alpha phase transition temperature of the Al2O3 aerogel is greater than or equal to 1300 DEG C. The specific surface area of the aerogel after heat treatment at 1300 DEG C is larger than 100 m / g, the process cost is controllable, and the aerogel is suitable for industrial production and can be applied to extreme environments such as a spacecraft thermal protection system and a high-temperature industrial furnace lining.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The invention discloses a multi-element eutectic molten salt eutectic component and melting point rapid prediction method, which comprises the following steps: S1, based on binary phase equilibrium data, using a Wilson model to obtain binary interaction parameters of corresponding components, and constructing a binary system database including binary system melting point, phase change enthalpy, molar ratio, biased Gibbs fusion energy and interaction parameters; and S2, based on the binary interaction parameters obtained in the step S1, calculating the eutectic components and the melting point of the multi-component molten salt by using a thermodynamic principle and a Newton-Raphson method in combination with the thermophysical property data of the single-component molten salt. According to the multi-element eutectic molten salt eutectic component and melting point rapid prediction method, the multi-element molten salt system eutectic component and the phase transition temperature can be calculated through binary molten salt system data, the dual advantages of being high in prediction speed and high in prediction precision are achieved, and the method has great significance in reducing experiment combinations, shortening experiment time and rapidly screening available formulas.

The invention discloses a double-phase-change temperature self-response thermal diode and a preparation method thereof, and belongs to the technical field of phase change thermal diode manufacturing. The thermal diode solves the problems that an existing thermal diode is complex in structure, high in direction dependence, weak in thermal rectification effect and the like. The phase change material comprises a supporting framework, a first heat conduction layer and a second heat conduction layer are arranged at the two opposite ends of the supporting framework respectively, a PNIPAM hydrogel phase change layer and a heat insulation functional layer are sequentially arranged in the supporting framework from the first heat conduction layer to the second heat conduction layer, and the heat insulation functional layer is provided with a steam channel; phase change of a water medium is induced through phase change of the PNIPAM hydrogel phase change layer, and heat flow generated by phase change of the water medium flows through the steam channel to achieve one-way heat transfer. Compared with the technical defects of complex preparation process, obvious structural direction dependence and response delay in the prior art, the preparation method has the advantages of simple and time-saving preparation process, weak direction dependence, high self-response speed and strong thermal rectification effect.

The invention belongs to the technical field of titanium alloy processing, and particularly relates to a preparation method of a titanium-copper alloy plate. According to the method, high-quality sponge titanium and high-purity electrolytic copper serve as raw materials, a Ti-5Cu alloy plate ingot is formed at a time through an EB electron beam cold bed melting process, volatilization and burning loss of a low-melting-point alloy element Cu are reduced by introducing pure argon or helium protective atmosphere with a certain pressure into a furnace chamber, gas impurities and low-melting-point impurities in the alloy are removed according to the partial pressure principle, and the high-quality sponge titanium and the high-purity electrolytic copper are obtained. The electrode preparation process is omitted, and the production process is simplified. By utilizing the advantages that the Ti-5Cu alloy is small in deformation resistance and good in plasticity when being rolled in a beta-phase region, the Ti-5Cu alloy is rolled in the beta-phase region above the phase transition temperature, it is guaranteed that the deformation amount of the alloy in the beta-phase region reaches 40-90%, and it is avoided that when machining of the beta-phase region is finished, thick grains are reserved in metal, and the mechanical property of the plate is reduced; and a uniform fine grain structure or a basket structure and relatively high mechanical properties can be obtained.

The invention discloses a TPE-based temperature-sensitive dendronized fluorescent molecule as well as a preparation method and application thereof, relates to the field of intelligent biosensors, and provides an innovative technical scheme of connecting a hydrophilic ether chain and hydrophobic tetraphenylethylene (TPE) based on an ester bond. By utilizing the stability and reaction activity of ester bond balance, stable connection of a hydrophilic ether chain and hydrophobic TPE is ensured, and meanwhile, molecules can regulate and control the reaction under specific conditions. According to the present invention, through the flexibility of ester bond synthesis and the accurate design of the molecular structure, the regulation of key parameters such as the hydrophilic ether chain length, the TPE substituent group and the like is achieved, the novel TPE-based temperature-sensitive dendronized fluorescent molecule is constructed, and the molecule can obtain different phase change temperatures and fluorescence intensities through the regulation of the substitution degree of the dendronized alkoxy ether element so as to provide the novel TPE-based temperature-sensitive dendronized fluorescent molecule, and the aggregation behavior of the molecules can be regulated and controlled through the temperature. Further, through a co-assembly effect, a more stable aggregate is formed, the amplification of an AIE effect is realized, and the environmental adaptability of a drug carrier is improved.

The invention discloses a natural convection-containing solid-liquid phase change prediction method based on LBM and physical information neural network fusion, and belongs to the field of solid-liquid phase change simulation. The problem that an effective scheme capable of reliably and accurately predicting the natural convection-containing solid-liquid phase change process is lacked at present is solved. The method comprises the following steps: constructing a fusion model of an LBM and a physical information neural network, wherein the model comprises a sub-network module and a macroscopic quantity calculation module; constructing a total loss function of the model, wherein the total loss function comprises data loss, equation constraint loss, initial condition loss and boundary condition loss; optimizing network parameters based on a self-adaptive training strategy of the residual error; and inputting a to-be-predicted space-time position coordinate, outputting a distribution function through the trained fusion model, deriving through a macroscopic quantity calculation module to obtain a temperature field, a velocity field and liquid content distribution, and determining a space-time evolution process of the phase change interface based on a mapping relationship between the temperature and the phase change temperature. The method is used in the fields of material processing and energy storage.

Intelligent control of solar transmission through windows promises to reduce energy consumption for thermal comfort in buildings. However, the ability of current smart windows to regulate solar gain based on tunable extinction of phase-change materials is not optimum. A thin-film thermochromic device based on tunable light scattering of hydrogel microparticles of prescribed diameters is reported. In the study, poly (N-isopropylacrylamide)-2-Aminoethylmethacrylate hydrochloride (pNIPAm-AEMA) microparticles are synthesized, with low phase transition temperature ˜32° C. Notably, the average size of pNIPAm-AEMA particles can vary from 1388 nm at 25° C. to 546 nm at 35° C., leading to unprecedented infrared transmittance modulation of 75.6%, in agreement with the numerical simulation based on Mie theory. A high luminous transmittance of 87.2% is accomplished. The pNIPAm-AEMA device demonstrates tunable scattering with excellent stability and scalability, which may find application in a broader field of light management beyond energy-saving smart windows.

The present invention discloses a method for inducing self-assembly of poly(phenylacetylene) into films by photoirradiation cross-linking polymerization reaction. Two phenylacetylene monomers containing dendrimeric alkoxy ether units and acrylate functional groups are used. Based on the two phenylacetylene monomers, a dendritic phenylacetylene copolymer is prepared by metal-catalyzed copolymerization reaction. The copolymer has a radial amphiphilic structure and temperature-sensitive characteristics. When its aqueous solution is heated above the phase transition temperature, dehydration aggregation occurs to form film-like assemblies. A photoinitiator is added to the copolymer aqueous solution, and under the condition of ultraviolet light irradiation above the phase transition temperature of the copolymer, the polymer further undergoes cross-linking and self-assembly to directly obtain a thin film. The thin film has excellent temperature responsiveness, and its thickness can be regulated by the copolymer concentration, copolymerization ratio, and irradiation time. The invention provides a new way to prepare thin film materials, with short reaction time, simple steps, and the prepared intelligent thin films having good prospects in aspects such as material separation and molecular selective permeation.

The present application relates to a kind of X80 pipeline electric arc additive manufacturing method and system based on thermal-mechanical coupling regulation mechanism, the method includes: first, the continuous cooling transformation curve of X80 steel is determined to determine phase transition temperature interval;Thermal-mechanical coupling finite element model containing mobile heat source and mobile force source is constructed and calibrated;On this basis, process prediction model is established, and the mapping relationship between process parameter and temperature field, stress field is obtained;Optimization algorithm is used in simulation space to carry out reverse optimization, and the optimal thermal-mechanical coupling process parameter combination is obtained;Finally, in actual repair process, deposit layer temperature is monitored in real time by infrared temperature measurement, when temperature falls into phase transition temperature interval and approaches optimal impact intervention temperature, drive with welding ultrasonic impact device to execute mechanical impact.The present application can significantly reduce residual tensile stress and improve the degree of grain refinement.

This invention discloses a room-temperature phase pyroelectric material and its preparation method, relating to the field of pyroelectric material technology, with the chemical formula C4H. 14 N₂OPbCl₄ is prepared as follows: 2-Dimethylaminoethylamine is cooled and stirred in an ice-water bath, then hydrogen peroxide solution is added dropwise while stirring. After the reaction, the resulting reaction solution is vacuum dried to obtain the nitrogen oxide of 2-dimethylaminoethylamine. The nitrogen oxide of 2-dimethylaminoethylamine and lead chloride are added to a concentrated hydrochloric acid solution, heated in an oil bath, and stirred to obtain a pyroelectric material. The pyroelectric material of this invention has a perovskite structure and undergoes a reversible phase transition reaction at a phase transition temperature of 27°C. During the phase transition, a current is generated at the polar axis of the crystal. The phase transition temperature at room temperature allows the pyroelectric material to operate within a relatively stable temperature range, providing reliable energy collection performance and showing great application value in waste heat utilization, self-sustaining systems, and other fields.

The invention belongs to the technical field of shape memory alloys, and particularly relates to a shape memory alloy with excellent high-temperature oxidation resistance and a preparation method and application thereof. According to the provided shape memory alloy, a compact Al2O3 oxide layer and / or high-adhesion chemical bonding can be generated, when Al and Si are added at the same time, tiny pores and grain boundary gaps of the Al2O3 oxide layer are filled with glassy state or fine crystalline state SiO2, and a continuous chemical protection layer of matrix-Ti (Hf)-O-Si-O-Al-Al2O3 is formed through bonding, so that the high-temperature oxidation resistance of the shape memory alloy is obviously improved; hf with a high melting point and a large atomic radius and the use amount of Al and Si can be further regulated and controlled, so that the shape memory alloy has excellent high-temperature oxidation resistance, austenite phase transformation temperature and plasticity comprehensive performance; therefore, the technical problem that an existing Ni-Ti-Hf shape memory alloy is low in high-temperature oxidation resistance is solved.

The application discloses a kind of W-VO2-based middle far infrared spaceflight thermal control multilayer film and its preparation and application method.The film includes aluminium substrate, inorganic medium layer, W-VO2 functional layer and protective layer in turn from bottom to top.The medium layer is used to constitute interference cavity;W-VO2 functional layer is deposited using magnetron sputtering method and is annealed, realizes phase change crystallization and the dynamic control of infrared emissivity;Protective layer is used to protect functional layer from environmental oxidation and mechanical damage, while the influence on infrared performance is limited.By adjusting the proportion of W element doping and the thickness of each layer, the phase transition temperature can be adjusted in the range of 15~68℃, and the emissivity modulation rate of 2~25μm wave band is 0.5-0.7, the visible reflectivity is 0.55-0.65.No obvious oxidation occurs after being placed in air for two weeks.The film has simple structure, controllable preparation process and stable performance, and is suitable for spacecraft cabin, battery panel, optical load and other aspects.

The invention provides a liquid crystal elastomer fiber, a preparation method thereof and an intelligent fabric, and relates to the technical field of liquid crystal elastomer fibers.The liquid crystal elastomer fiber is prepared from a liquid crystal monomer RM257, a chain extender bis (3-mercaptopropionic acid) ethylene glycol, a cross-linking agent triallyl isocyanurate, an antioxidant, a photoinitiator and a catalyst according to a specific proportion, the liquid crystal monomer RM257 provides an acrylate group, the chain extender provides a thiol group, the cross-linking agent provides vinyl, and the proportion of the acrylate group, the thiol group and the vinyl is regulated by regulating the proportion of the liquid crystal monomer, the chain extender and the cross-linking agent, so that the phase transition temperature of the prepared liquid crystal elastomer prepolymer is influenced, and the phase transition temperature of the prepared liquid crystal elastomer prepolymer is reduced. And finally obtaining the liquid crystal elastomer fiber with lower driving temperature. The driving temperature of the intelligent fabric is low, and the intelligent fabric is suitable for the human body surface.

This invention provides a difluoroterminated alkenyl liquid crystal compound, its preparation method, and its application. The difluoroterminated alkenyl liquid crystal compound has the structure shown in the general formula P. The alkenyl-terminated liquid crystal compound of this invention has a large response speed, a large refractive index, a clearing point, and a wide phase transition temperature. Its synthesis method has a high yield, simple post-processing, and is suitable for industrial production.

The invention provides an aerosol generating device which is provided with at least two atomizers, the first atomizer is used for atomizing a first solution, the first solution is provided with a first solvent system, the second atomizer is used for atomizing a second solution, and the second solution is provided with a second solvent system. The first solvent system is different from the second solvent system, and the heating atomization temperature T1 of the first atomizer, the phase change temperature B1 of the first solution, the heating atomization temperature T2 of the second atomizer and the phase change temperature B2 of the second solution meet the following relation: (T1-B1)-(T2-B2) > 0 DEG C. By adopting the scheme, the two atomizers can be respectively controlled to generate aerosols with different particle sizes, and the particle size control accuracy of the aerosols is improved.

A kind of porosity controllable additive manufacturing method of nickel-manganese-tin-cobalt alloy and application of the obtained product.The present application belongs to the field of solid refrigeration.The present application aims at the intrinsic brittleness of nickel-manganese-tin-based alloy,which is difficult to be processed into complex-shaped parts by traditional casting and numerical control processing,limiting its application.Meanwhile,aiming at the problem that the existing additive manufacturing method is easy to produce residual stress and element segregation,which affects the structural integrity and magnetic heat performance of the alloy.The present application uses water-based binder to carry out layer-by-layer spray forming of alloy powder,then adds deoxidizer and manganese powder,and carries out high-temperature sintering under vacuum condition to obtain nickel-manganese-tin-cobalt alloy with controllable porosity.The method of the present application effectively avoids the oxidation of the sample,so that the sample maintains good magnetic-structural characteristics,and obtains nickel-manganese-tin-based alloy with specific porosity,phase transition temperature interval near room temperature,and magnetic heat performance comparable to that prepared by traditional method,which shows broad application prospects in the field of magnetic refrigeration and other fields.

The invention provides a constant-temperature battery, application and an implantable medical device, and relates to the technical field of medical devices. The constant-temperature battery is characterized in that a temperature-sensitive hydrogel layer is grown on the surface of a battery shell in situ, temperature-sensitive hydrogel of the temperature-sensitive hydrogel layer has biocompatibility, and the phase change temperature is 36-39 DEG C. The temperature-sensitive hydrogel with biocompatibility and the phase change temperature of 36-39 DEG C grows on the surface of the battery shell in situ, when the temperature of the battery exceeds the phase change temperature, the hydrogel absorbs heat in a phase change mode, and when the temperature of the battery is lower than the phase change temperature, the hydrogel releases heat in a phase change mode, so that the overall constant temperature is maintained, and the service life of the battery is prolonged. When the battery is used as a power supply of an implantable medical facility, the battery can adapt to the temperature of a human body, does not cause overheating of peripheral tissues, can also adapt to actual use environment adjustment requirements, and can be widely applied to the field of implantable medical instruments.

A method for measuring phase transition temperature using electrical conductivity, comprising: preparing a graph of change in conductivity of molten salts according to temperature, and performing at l

The invention discloses a method and system for recycling magnetic powder in oil-based neodymium iron boron cutting fluid, and belongs to the technical field of neodymium iron boron magnetic material recycling. The method comprises the following steps: feeding oil sludge waste generated by neodymium iron boron processing into a flame-proof magnetic separator, sorting out magnetic sludge, and marking and storing in batches; carrying out thermal performance test on the magnetic mud sample, and determining the volatilization temperature of the oil-based cutting fluid and the neodymium iron boron phase transition temperature; and the magnetic mud is placed in a vacuum furnace, the treatment temperature is set according to a key temperature point measured by thermogravimetry, moisture and cutting fluid impurities are removed through two-step heating treatment under the assistance of high-purity argon, and finally the high-purity neodymium-iron-boron magnetic powder is obtained. The invention further provides a recovery system, the high-performance magnetic powder is directly recovered on the premise of avoiding damage to the main phase structure of neodymium iron boron through a synergistic process of magnetic separation, thermogravimetric analysis and vacuum heat treatment, the problems of resource waste and environmental pollution of a traditional wet process and pyrogenic process recovery process are solved, and green cyclic utilization of magnetic materials is achieved.

The invention discloses a zero sample prediction and numerical phase diagram generation method and system for a creep behavior of a metal material, and belongs to the technical field of digital design and performance prediction of materials. The method comprises the following steps: firstly, constructing a cross-material generality rule mapping relation library, and establishing quantitative correlation among material macroscopic attributes, crystal structures, phase change temperatures, physical mechanism weight distribution and model parameters; for a to-be-predicted target metal material, a preset model and parameters can be called from the relation library only by inputting the crystal structure and the melting point of the to-be-predicted target metal material, a high-precision physical mechanism weighted network prediction model is automatically assembled, and accurate prediction of the creep behavior of the to-be-predicted target metal material in the full stress-temperature domain is achieved. Through continuous calculation and visualization, a quantitative and continuous creep numerical phase diagram with physical interpretability is generated, and competition and evolution of different creep mechanisms are visually revealed. According to the method, normal form transformation from experience fitting to physical prediction is realized, and a core tool is provided for rapid evaluation and digital design of new materials.

The invention discloses a medium-temperature zone phase change material and a preparation method thereof, and the preparation method comprises the following steps: stirring a mixed solution containing stearic acid, zinc salt, triethylamine and ethanol, reacting, centrifuging, and drying to obtain the medium-temperature zone phase change material. The stearic acid reacts with the zinc salt to generate the novel medium-temperature zone phase change material, the phase change temperature is 117.49 DEG C, and the phase change enthalpy value is 184.16 J / g. The phase change material is simple in synthesis process, relatively high in phase change enthalpy value and good in phase change cycle stability. The method has important application prospects in the two aspects of heat energy collection and temperature control in a medium-temperature area.

The invention discloses a nanoparticle capturing method and related equipment, and the method comprises the following steps: uniformly covering a hydrogel solution on a sample liquid drop containing target nanoparticles on a glass slide to form a standard observation system; the hydrogel solution is temperature sensitive type hydrogel; determining a local area where the target nanoparticles are located in a standard observation system; starting a laser, controlling the laser to irradiate the local area, and regulating and controlling the laser power density of the laser, so that the temperature of the local area reaches and is maintained at the phase change temperature of the hydrogel solution; and adjusting laser parameters of the laser to generate stable hydrogel at the position of the target nanoparticle. According to the embodiment of the invention, the nano-particles can be captured by utilizing the characteristics of the temperature-sensitive hydrogel and combining a simple photo-thermal device, the influence caused by the limitation of capturing environment conditions or capturing sample properties is reduced, and the method can be widely applied to the technical field of nano-particle capturing.

The invention discloses a composite insulating material with strong electrical tree resistance and a self-repairing function and a method. The composite insulating material is composed of a polymer matrix and a saturated fatty acid triglyceride phase change filler dispersed in the polymer matrix. Wherein the saturated fatty acid triglyceride is uniformly dispersed and distributed in the polymer matrix, the grain size, the crystal structure and the crystallinity of the composite material are not obviously different from those of a pure polymer prepared under the same condition, and the melting point of the saturated fatty acid triglyceride is lower than 100 DEG C; when the working temperature of the composite insulating material is lower than the melting point, the composite insulating material exists in a solid state, and the composite insulating material is a solid composite insulator; when the local temperature of the composite insulating material is increased to be higher than the phase change temperature, the saturated fatty acid triglyceride is molten into a liquid state, micro defects or air gaps are filled in situ, and the solid-liquid composite insulating structure with the self-repairing function is formed.

The application provides a SEBS-based liquid crystal elastomer and a preparation method, and belongs to the field of synthesis and application of thermoreversible deformation liquid crystal polymers. The liquid crystal elastomer is a low-crosslinking polymer network prepared by light crosslinking solidification of ethylene-ethylene / butylene-styrene block copolymer SEBS and a main-chain type liquid crystal oligomer with two terminal mercapto groups, is prepared by a two-step crosslinking method, is prepared by a two-step method of PS segment physical domain pre-crosslinking and mercapto-alkene click reaction light crosslinking, and has bidirectional reversible deformation capability. The application realizes the regulation of the phase transition temperature and reversible deformation capability of the polymer material by controlling the content of liquid crystal units and the crosslinking solidification degree; provides a new idea and method for preparing intelligent flexible driver materials with novel functions; and is beneficial to the development of SBS and SEBS materials in the direction of high performance and intelligence based on the liquid crystal polymer network.

This invention relates to the field of aerospace computing center technology, and particularly to a heat dissipation method and system for a low-Earth orbit commercial aerospace computing center. The method includes: calculating the thickness of a pyrolysis layer, a melting layer, and a sublimation layer based on mission-specified thermal parameters, ensuring that the pyrolysis temperature of the pyrolysis layer is less than the phase transition temperature of the melting layer, which is less than the phase transition temperature of the sublimation layer; attaching the heating surface of the computing module to a uniform heat-conducting layer, and then vertically attaching the pyrolysis layer, melting layer, and sublimation layer layer by layer on the uniform heat-conducting layer, allowing the heat from the computing module to flow vertically; setting a unidirectional exhaust layer on the outside of the pyrolysis layer, melting layer, and sublimation layer, allowing the gas to flow only laterally outwards; during operation, the module absorbs heat by consuming its own mass through three stages of intense irreversible phase transitions (pyrolysis, melting, and sublimation), and dissipates the remaining heat through directional gas injection. This invention effectively achieves passive and efficient heat dissipation for kilowatt-level high heat flux in aerospace computing centers.