13 results about "Pmma polymer" patented technology

The invention discloses a derived carbon coated Mg-Ni-Ce hydrogen storage alloy. The phase composition after activation and carbonization treatment is an Mg phase, an Mg2Ni phase and a CeHx phase; the content of Mg is 80 to 84 wt.%, the content of Ni is 4 to 8 wt.%, the content of Ce is 10 to 14 wt.%, and the content of the PMMA polymer is 1 to 5 wt.%. The preparation method comprises the following steps: 1, preparing a PMMA coated Mg-Ni-Ce alloy precursor; and 2, preparation of the derived carbon coated Mg-Ni-Ce hydrogen storage alloy. When the alloy is used as a hydrogen storage alloy, under the hydrogen condition, the maximum hydrogen absorption amount reaches 5.40-5.60 wt.%, and the hydrogen desorption amount reaches 5.20-5.40 wt.%. After simulated poisoning treatment under the P atmosphere condition, the hydrogen absorption amount reaches 4.60-4.80 wt.%, and the hydrogen desorption amount reaches 4.0-4.20 wt.%.

The application discloses a self-cleaning and cooling flexible transparent film and a preparation method thereof. The flexible film is mainly composed of PVDF and PMMA polymer monomers, and the preparation method comprises the following steps: mixing PVDF and PMMA, adding a solvent DMAc or DMF, and fully stirring to obtain a colorless transparent solution; adding a low surface energy modifier trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane or octadecyl trimethoxysilane into the colorless transparent solution and fully dispersing by magnetic stirring; placing the prepared solution at room temperature for 2-4 hours, transferring the solution to a cleaned glass, coating a film on the surface of the substrate by an adjustable scraper, forming a flat coating, and placing the coating into a 70-130 DEG C oven to completely solidify. The film is a flexible and bendable film, has good light transmittance, a hydrophobic rolling angle, and has remarkable refrigeration and cooling performance, and can be widely used in the outer surfaces of objects, such as special-shaped curved surfaces, solar cell panels and building glasses, which need light transmission and cooling.

The invention discloses a tunable surface plasmon excitation structure, and belongs to the technical field of micro-nano photoelectron, the tunable surface plasmon excitation structure comprises a substrate, a metal film is arranged on the substrate, asymmetric slits are arranged on the metal film, the slits comprise small grooves and large grooves, PMMA polymers are arranged in the small grooves, polyimide orientation layers are arranged on the two sides of the interior of each large groove, and the polyimide orientation layers are arranged between the small grooves and the large grooves. A liquid crystal layer is arranged in the middle of the large groove, a layer of PMMA polymer is arranged on the top face of the metal film, the metal film on the two sides of the slit is isolated, insulated and disconnected, impressed voltage is arranged on the metal film on the two sides of the slit, the liquid crystal layer is located in an electric field formed by the impressed voltage, and the refractive index of the liquid crystal layer is changed by adjusting the impressed voltage. Therefore, the amplitude of the surface plasmon electric field is regulated and controlled. The tunable surface plasmon excitation structure has the advantages of being simple in structure, convenient to implement, rapid in response, beneficial to small integration and the like.

The invention belongs to the technical field of semiconductor photoelectric devices, and discloses a novel LED device based on a perovskite quantum dot and PMMA composite film, and the device sequentially comprises a packaging layer, a perovskite quantum dot-PMMA composite light-emitting layer, a blue light chip, transparent silica gel, symmetrically arranged supports, a metal heat dissipation disc, and symmetrically arranged bonding pads from top to bottom. The perovskite quantum dots are uniformly dispersed and fixedly sealed in the PMMA polymer matrix, so that a compact and stable composite film is formed, and the resistance of the quantum dots to water, oxygen and heat is remarkably improved. And the organic silicon packaging layer with high performance at the top is combined, so that a dual protection mechanism is formed, and the service life of the device is greatly prolonged. The perovskite quantum dot is used as a luminescence center, the narrow emission spectrum (FWHM) of the perovskite quantum dot brings high-color-purity red light emission (the peak value is 619 nm), and the color gamut is wide. The full-quantum-dot light-emitting structure avoids stokes loss of traditional fluorescent powder, and the light conversion efficiency is high.

The application discloses a surface plasmon switch, and belongs to the technical field of micro-nano photoelectronic technology.The surface plasmon switch comprises a glass substrate, wherein a gold film is arranged on the glass substrate; the gold film is provided with an asymmetric slit; the slit comprises a small groove and a large groove; PMMA polymers are arranged in the small groove and on the top surface of the gold film; polyimide orientation layers are arranged on both sides in the large groove; a liquid crystal layer is arranged in the remaining part of the large groove; the gold films on both sides of the slit are isolated and insulated; an external voltage is arranged on the gold films on both sides of the slit; the liquid crystal layer is in an electric field formed by the external voltage; incident light is excited to be normally incident from one side of the glass substrate; the refractive index of the liquid crystal layer is changed by switching and adjusting the external voltage; and the switching state of the surface plasmon switch is controlled.The surface plasmon switch provided by the application has the advantages of simple structure, good switching performance, convenience in implementation, rapid response, small size, high practicability and the like.

The application discloses a tunable surface plasmon excitation structure and belongs to the technical field of micro-nano photoelectronic technology, which comprises a substrate, a metal film is arranged on the substrate, an asymmetric slot is arranged on the metal film, the slot comprises a small groove and a large groove, PMMA polymer is arranged in the small groove, polyimide orientation layers are arranged on both sides of the inside of the large groove, a liquid crystal layer is arranged in the middle of the large groove, a layer of PMMA polymer is arranged on the top surface of the metal film, the metal films on both sides of the slot are isolated and disconnected, an external voltage is arranged on the metal films on both sides of the slot, the liquid crystal layer is in an electric field formed by the external voltage, the refractive index of the liquid crystal layer is changed by adjusting the external voltage, and thus the size of the surface plasmon electric field amplitude is realized. The tunable surface plasmon excitation structure has the characteristics of simple structure, convenient implementation, rapid response, small integration and the like.

The invention discloses a PMMA (polymethyl methacrylate) polymer film-based adjustable methylbenzene QCM (quartz crystal microbalance) gas sensor as well as a preparation method and application thereof. Spin-coating polymethyl methacrylate (PMMA) on the silicon wafer, and heating and curing; putting the silicon wafer into an inductively coupled plasma etching cavity, and treating the cross-linked surface PMMA by using Ar or CF4; spin-coating polyvinyl alcohol (PVA), and heating and curing; putting the silicon wafer into acetone to dissolve PMMA at the bottom; the silicon wafer and the QCM are immersed in isopropanol, and a floating film is reversed and transferred to the QCM; placing the QCM on a heating table to dry the QCM to obtain a QCM sheet loaded with the VOCs gas-sensitive film; and placing the obtained QCM on a detection circuit. The methylbenzene gas-sensitive film with the thickness within 10 nm is prepared for the first time, the response time of a methylbenzene QCM sensor is as low as 3 s, the detection limit reaches 492 ppb, the methylbenzene gas-sensitive film belongs to an ultrathin and ultrafast response methylbenzene QCM sensor, and the methylbenzene gas-sensitive film has important significance on fast detection of extremely-low-concentration methylbenzene in actual production.

The present invention provides an optical copolymer flame-retardant board, a preparation method thereof, and a reactive extrusion device, relating to the technical field of acrylic material production. The preparation method comprises the following steps: placing a mixture comprising vinyl phosphate, methyl methacrylate, a comonomer, and a functional monomer into a prepolymerization reactor for polymerization to obtain a first prepolymer; mixing the mixture comprising methyl methacrylate, a comonomer, and a functional monomer with the first prepolymer, and placing the mixture into a tubular reactor for polymerization to obtain a second prepolymer; and mixing the mixture comprising methyl methacrylate, a comonomer, and a functional monomer with the second prepolymer, and placing the mixture into a devolatilization extruder. After discharge, the material is granulated and pressed to obtain an optical copolymer flame-retardant board. The preparation method of the optical copolymer flame-retardant board provided by the present invention incorporates phosphate into PMMA polymer chains, resulting in an optical copolymer flame-retardant board with high transparency and excellent flame retardancy.

The invention relates to the technical field of fiber preparation, in particular to a spectrum self-adaptive radiation refrigeration fiber and a preparation method and application thereof.The spectrum self-adaptive radiation refrigeration fiber is prepared from, by weight, 20-50 parts of radiation refrigeration master batch and 50-80 parts of fiber forming polymer master batch. The radiation refrigeration master batch is prepared from the following raw materials in parts by weight: 5 to 20 parts of radiation refrigeration composite powder, 5 to 10 parts of near-infrared regulation particles and 75 to 80 parts of fiber-forming polymer, the radiation refrigeration composite powder is prepared from the following raw materials: an aluminate rare earth compound, inorganic powder and a fatty acid modifier. According to the near-infrared regulation and control particle, modified tungsten-doped vanadium dioxide serves as a core layer, and a PMMA polymer containing methacryloyloxypropyl polyhedral oligomeric silsesquioxane serves as a shell layer. By introducing the self-prepared radiation refrigeration master batch, the problems that the temperature of existing radiation refrigeration fibers cannot be adjusted and a melt spinning process cannot be met are effectively solved, and the actual application requirements are better met.

The invention provides a graphene stacked and buried high-order mode all-optical switch and a preparation method thereof. The structure of the high-order mode all-optical switch comprises a substrate layer, an asymmetric three-dimensional (3D) Mach-Zehnder interferometer (MZI) core layer, a cladding layer and a graphene-PMMA multilayer structure. The 3D MZI structure can realize independent regulation and control of a basic mode (E00) and a first-order mode (E01), and the graphene-PMMA multilayer structure is characterized in that single-layer graphene is accurately arranged in a PMMA polymer material in a stacking and burying manner, so that the problem that the graphene is easy to crack in a traditional graphene transfer process is solved; and the longitudinally arranged graphene films have excellent photothermal conversion performance and thermal conductivity, so that heat can be diffused into the waveguide core layer. The invention relates to a low-power-consumption and quick-response high-order mode optical switch and a preparation method thereof, which improve the regulation and control capability of a photonic device on a multi-mode optical field and are suitable for the fields of a high-capacity mode division multiplexing technology and a multi-dimensional integrated photonic chip.

The invention discloses a surface plasmon switch, which belongs to the technical field of micro-nano photoelectron, and comprises a glass substrate, a gold film is arranged on the glass substrate, the gold film is provided with asymmetric slits, the slits comprise small grooves and large grooves, PMMA polymers are arranged in the small grooves and on the top surface of the gold film, polyimide orientation layers are arranged on two sides in the large grooves, and the surface plasmon switch is arranged on the surface of the glass substrate. The other part in the large groove is provided with a liquid crystal layer, the gold films on the two sides of the slit are isolated, insulated and disconnected, external voltage is arranged on the gold films on the two sides of the slit, the liquid crystal layer is located in an electric field formed by the external voltage, incident light is excited to be normally incident from one side of the glass substrate, and the refractive index of the liquid crystal layer is changed by switching and adjusting the external voltage. Therefore, the on-off state of the surface plasmon switch is controlled. The surface plasmon switch provided by the invention is simple in structure, good in switching performance, convenient to implement, rapid in response, beneficial to small integration and high in practicability.

The application discloses a kind of super double-tube spraying method and its application in biomass degradation, fungus growth, wrap deposition and the like.The super double-tube spraying method includes using high-pressure spray gun, and spraying mist drop after super double-tube, namely super double-tube spraying, wherein the super double-tube is PMMA polymer tube with super double-tube coating on inner wall, and the raw material for preparing the super double-tube coating includes TiO2 nanoparticle and hydrophobic epoxy resin.The application introduces super double-tube spraying technology, and by combining contact charging (CE) and induced charging (IE) effect, a kind of super double-tube spraying (SAP T-spraying) method is developed, which not only simplifies and optimizes the design of spraying, but also significantly improves the charge mass ratio (CMR) of mist drop, to realize efficient deposition on super-hydrophobic blade surface.