383 results about "Polybutyl methacrylate" patented technology

Blends of amorphous and semicrystalline polymers having shape memory properties were prepared by blending a crystalline polymer such as poly(vinylidene fluoride), polylactide, poly(hydroxxybutyrate), poly(ethylene glycol) polyethylene, polyethylene-co-vinyl acetate, poly(vinyl chloride), poly(vinylidene chloride) and copolymers of poly(vinylidene chloride) and poly(vinyle chloride) and an amorphous polymer such as poly(vinyl acetate), poly methyl acrylate, poly ethyl acrylate, atactic poly methyl methacrylate, isotactic poly methyl methacrylate, syndiotactic poly methyl methacrylate and other poly alkyl methacrylates. The method for preparing the polymeric materials and applications thereof, for example, as smart medical devices, are also disclosed.

A coated coronary stent, comprising: a stainless steel sent framework coated with a primer layer of Parylene C; and a rapamycin-polymer coating having substantially uniform thickness disposed on the stent framework, wherein the rapamycin-polymer coating comprises polybutyl methacrylate (PBMA), polyethylene-co-vinyl acetate (PEVA) and rapamycin, wherein substantially all of the rapamycin in the coating is in amorphous form and substantially uniformly dispersed within the rapamycin-polymer coating.

The invention relates to a process for the preparation of monolithic xerogels and aerogels of silica/latex hybrids under subcritical conditions. In the two-stage synthesis of these alcogels in the presence of an acid-base catalyst, the hydrolysis and polycondensation of a silicon alkoxide are carried out in an organic medium containing excess water. A latex consisting of polybutyl methacrylate and polybutyl acrylate, modified with alkoxysilane groups, is first synthesized and then incorporated in the mixture either in the first stage in order to effect its co-hydrolysis with the silicon alkoxide, or in the second stage to effect its co-condensation with the previously hydrolysed colloidal silica. The resulting alcogels are aged, washed, and dried under subcritical conditions. This process gives hybrid products containing 0.1-50 wt-% of latex and having a density of 300-1300 kg/m3, a porosity of 40-85%, a specific surface area of 400-900 m2/g and a mean pore diameter of 2-12 nm. The products are resistant to atmospheric humidity and moisture, have better mechanical properties than the corresponding inorganic products, and can be used as thermal, acoustic and electrical insulators.

The invention relates to a intraocular lens. At present the Poly-Methyl Methacrylate (PMMA) intraocular lens conventional for clinical treatment of cataract always causes inflammatory treaction after implantation. Posterior capsule opacification is also a major compalication after cataract surgery. The invention selects fluorouracil to solve the above problems. Based on weak penetrating force of chitosan nanoparticles in eyes and the relation between the phagocytosis amount of conjunctival epithelial cells to nanoparticles and the particle size of nanoparticles, the fluorouracil nanoparticles preparation is prepared using chitosan-poly(acrylic acid) as carrier, composite coated on the surface of PMMA intraocular lens. The invantion also provides a preparation method thereof. The said intraocular lens not only increases the biocompatibility of the intraocular lens, but also inhibites posterior capsule opacification pafter cataract surgery. The said intraocular lens can also prevent anterior membrane after implantation of intraocular lens and after-cataract.

The present invention relates to a method for bonding two surfaces to one another. The invention particularly pertains to the use of such method in which one of the surfaces is a polymeric plastic (and more preferably a polymeric thermoplastic (especially poly-(methyl methacrylate) (“PMMA”) or cyclic olefin copolymer (“COC”)). More particularly, the invention relates to treating at least one of the contacting surfaces with UV in the presence of oxygen to thereby generate ozone (O₃) and atomic oxygen under conditions of temperature below that of the glass transition temperature of the polymeric plastic. The UV/O₃-mediated bonding results in high bond strength and zero-deformation method. This bonding method can be applied to micro/nano-scale polymer devices, and particularly to microfluidic devices, for a low cost, high throughput, high yield advantage.

The invention provides a preparation method of modified superfine calcium carbonate powder. The preparation method comprises following steps: raw material mixing, slurry preparation, wet grinding, drying collection, depolymerization scattering and modified treatment, wherein a dispersing agent at least comprises ammonium polyacrylate salt, sodium hexametaphosphate and sodium polyacrylate salt; a modifying agent comprises one or more of octadecylamine, polymethyl methacrylate, a titanate coupling agent and a silane coupling agent; and a hyperdispersant comprises one or more of a polyester type hyperdispersant, a polyether type hyperdispersant, a polyacrylate hyperdispersant and a polyolefin hyperdispersant. By virtue of the preparation method, the dispersity of the powder can be improved, the dry-wet cover effects of building coatings can be improved, and the addition amount of titanium dioxide can be reduced.

By copolymerisation of compounds which are acid or have a hydroxy or epoxy function in a casting resin with a filler contents of between 10 and 80%, moulded parts on a polymethylmethacrylate basis are obtained which pass the B1-test even without addition of fire-retardant agents and in addition present improved mechanical properties.

The invention relates to a large monocrystal graphene and a preparation method thereof. The preparation method comprises the following steps: 1) in a non-reducing gas atmosphere, carrying out annealing treatment on a copper base; 2) while introducing reducing gas into a reactor, carrying out annealing reduction on the copper base subjected to annealing treatment in the step 1); and 3) depositing graphene on the surface opposite the substrate on the gap formed by the two copper bases subjected to annealing reduction by a chemical vapor deposition process, thereby obtaining the isolated large monocrystal graphene. The preparation method can also further comprise the following steps: by using polymethyl methacrylate (PMMA) or polyethylene terephthalate (PET) as a medium, transferring the large monocrystal graphene onto the target base, and adjusting the growth time and gas flow rate in the graphene growth process to quickly prepare the isolated large monocrystal graphene sample. The method does not need longer preparation time or any expensive monocrystal base.

Compositions for directed self-assembly (DSA) patterning techniques are provided. Methods for directed self-assembly are also provided in which a DSA composition comprising a block copolymer is applied to a substrate and then self-assembled to form the desired pattern. The block copolymer includes at least two blocks of differing etch rates, so that one block (e.g., polymethylmethacrylate) is selectively removed during etching. Because the slower etching block (e.g., polystyrene) is modified with an additive to further slow the etch rate of that block, more of the slow etching block remains behind to fully transfer the pattern to underlying layers.

The invention pertains to the technology field of micro total analysis, relating to a three-dimensional micro-flow control chip which includes an in-situ polybutyl methacrylate pretreatment integral pole. The polymer butyl methacrylate pretreatment integral pole is prepared by ultraviolet-radiated in-situ polymerization in the micro-channel on the micro-flow control chip; the substrate of the micro-flow chip can adopt glass, silicon, polymethyl methacrylate (PMMA) or poly(dimethylsiloxane) (PDMS), and the like as base materials, and etched with micro-channel networks for fluid mixing and reaction; the cover plate adopts PDMS integral casting method to fabricate the micro-channels of the solid-phase extracting and processing unit, a fluid lead-in/lead-out hole is arranged at the position corresponding to each micro-channel opening of the substrate, and is directly bounded with the substrate, and integration of the sample pretreatment integral pole and the micro-flow control chip micro-pipeline network is realized. The chip has the advantages of easy fabrication, low cost, small sampling quantity, rapid compartment analysis, and is applicable to pretreatment, analysis and test of sophisticated biochemical samples.

The invention relates to a graphene modified poly-methyl methacrylate composite and preparation method thereof, wherein the method comprises the following steps: stripping graphite from 1-methyl-2-pyrrolidone by solvent ultrasonic method and preparing grapheme solution, and adding methymethacrylate and azodiisobutyronitrile and heating them, and reacting them; pouring the product into methanol, and sequentially centrifuging, washing and vacuum drying it to obtain graphene enhanced poly-methyl methacrylate composite. The 0.5% graphene enhanced poly-methyl methacrylate composite synthetized by one-step method in the invention, wherein the tensile strength is 115% higher than the pure poly-methyl methacrylate polymer, and Young modulus is raised by 221%, and excellent mechanical property is revealed. The thermogravimetric analysis displays shows that in comparison with the poly-methyl methacrylate, the temperature for the graphene enhanced poly-methyl methacrylate composite material comprising 0.5% of the invention when the thermogravimetric loss reaches 10% is raised by about 30 degrees centigrade, which means the composite material prepared by the invention has higher heat stability.

The invention discloses a nickel oxide electrochromic film and a preparation method thereof. The nickel oxide electrochromic film is a NiO nanowire array film, the diameter of the NiO nanowire is 5-100 nm, and the length is 50 nm to 5 mu m. The preparation method comprises the following steps of: taking polymethylmethacrylate-b-polystyrene segmented copolymer as a template, preparing a precursor Ni(OH)2 nanowire array in a water solution of Ni(NO3)2 and NaNO3 through the cathode electrodeposition method, dissolving the precursor Ni(OH)2 nanowire array in a toluene solution to remove the template, and carrying out head treatment to obtain the NiO nanowire array film. The nickel oxide electrochromic film has good properties, quick color change, high coloring efficiency and excellent cycling stability. The nickel oxide electrochromic film can be assembled into various electrochromic devices and has broad application prospects in the fields of information storage, architectural glass, smart windows, large screen display and the like.

The invention relates to a preparation method of a polymethyl methacrylate (PMMA) cellular gradient material. The method specifically comprises: placing a unidirectionally opened die loaded with PMMA into an autoclave, controlling the oriented adsorption of highpressure carbon dioxide in PMMA to form a concentration gradient, with the pressure of the carbon dioxide controlled at 10-30MPa and the temperature maintained at 50-150DEG C, preserving the heat and pressure for 1-60min, then conducting pressure releasing, and finally cooling a sample to room temperature with an ice-water mixture, thus obtaining the cellular gradient material. A cellular structure with a small cell diameter and a thin cell wall forms in a high concentration carbon dioxide diffusion area on the surface layer, a cellular structure with a large cell diameter and a thick cell wall forms in a low concentration area of the central section, and the innermost layer is compact PMMA matrixes. The porosity of the sample changes from high to low continuously from the surface layer to the inner layer. With a cell diameter controlled at micron magnitude, the gradient material provided in the invention has good dimensional stability, wide porosity variation range and high mechanical strength.

The invention relates to a poly(lactic acid)/poly(methyl methacrylate) alloy material and a preparation method thereof. The alloy material comprises the following components in percentage by mass: 50 to 90 percent of poly(lactic acid), 10 to 50 percent of poly(methyl methacrylate), 0.1 to 2 percent of heat stabilizer, and 0.1 to 2 percent of lubricant, wherein the sum of mass percentages of the components is 100 percent. The material and the method have the advantages that: the method selects the poly(methyl methacrylate) and the poly(lactic acid) for melt blending, and the obtained polymer alloy material solves the problems that a transparent poly(lactic acid) material has poor heat resistance and is difficult to use in summer; a semitransparent material with high heat resistance is prepared by performing annealing treatment on polymer alloy, which effectively extends the application range of the poly(lactic acid); and the method is simple, can finish the preparation of the polymer alloy material through conventional plastic processing means, and is suitable for industrialized production.

This patent specification discloses a method and compositions for applying an artificial finger nail tip to a natural finger nail. The method applies: (i) multiple brush-on coatings of a mixture of ethyl-2-cyanoacrylate, poly methyl methacrylate, and hydroquinone; (ii) several spray coatings of an aromatic dryer of ethyl acetate and aromatic amines; and (iii) at least one dip of glaze powder of poly (ethyl or ethyl/methyl) methacrylate, benzoyl peroxide, and silica as an opaquing agent. The preferred method is very easy to perform and does not require any use of polymer solvents or grinding or filing steps.

The invention relates to high Tg monolithic and multi-layer thermoformable film or sheet useful as a backsheet on a photovoltaic module (PV). A methacrylic-based material is preferred. The film or sheet is formed of a composition having a Tg greater than 110° C. The methacrylic composition may be a blend of a polymethyl methacrylate polymer and a miscible or semi-miscible high Tg polymer, or may be a copolymer containing primarily methyl methacrylate monomer units. The backsheet is optionally covered with a fluoropolymer or acrylic/fiuoropolymer covering on the outside (side facing the environment). The back-sheet can be clear, white, and/or pigmented. The film or sheet is especially useful in concentrating photovoltaic modules (CPV), and is also useful in thin film photovoltaic modules.

This invention relates to one micro flow control chip and its process method with sample pre-process film, wherein, the chip is composed of bottom slice and cover slice; the bottom slice uses glass, silicon, PMMA or PDMS as basic materials to etch flow mixture and reaction micro channel network; the cover slice adopts PDMS process sealed to bottom slice; in the relative position of each channel opening liquid guide hole for micro flow; putting sample process film in the pointing position to sample entrance imbedded into cover slice.

The invention relates to the field of drilling fluids, and discloses a modified nano-silica plugging agent, a water-based drilling fluid, and preparation methods and applications of the modified nano-silica plugging agent and the water-based drilling fluid. The preparation method of the plugging agent comprises the steps: (1) making nano-silica contact with a mixed solution containing acrylic acidand polybutyl methacrylate, and carrying out ultrasonic dispersion to obtain an oil phase solution; (2) contacting water, polyethylene glycol octylphenyl ether and sodium bicarbonate, and carrying out emulsification treatment to obtain a first emulsified solution; (3) carrying out secondary emulsification treatment on the oil phase solution and the first emulsified solution to obtain a second emulsified solution; and (4) under the protection of nitrogen, contacting the second emulsified solution with a water-soluble initiator, and carrying out centrifugal separation on the product obtained after contacting and drying to obtain the plugging agent. The plugging agent can enter stratum pores of a mudstone and limestone interlayer for plugging, has good pressure bearing capacity, can preventpressure transmission from expanding the pores, and can meet the oil and gas exploitation work of mud shale.