11results about How to "Reduce intermolecular forces" patented technology

The invention discloses a preparation method of alkyl modified silicone oil single-phase immersed coolant and application of the alkyl modified silicone oil single-phase immersed coolant in data center cooling, and belongs to the technical field of coolants.The preparation method comprises the steps that firstly, long-chain alpha olefin is used for modifying tetramethylcyclotetrasiloxane to obtain long-chain alkyl tetramethylcyclotetrasiloxane; then, long-chain alkyl tetramethyl cyclotetrasiloxane and octamethyl cyclotetrasiloxane serve as monomers, modified double-long-chain alkyl tetramethyl disiloxane serves as an end-capping reagent, copolymerization is conducted, and the long-chain alkyl end-capped single-long-chain alkyl monomethyl siloxane / dimethyl siloxane copolymer is obtained. By adopting the method disclosed by the invention, a copolymer product with relatively low steric hindrance can be prepared, a side chain alkyl group and a polymer structure can be accurately regulated and controlled, silicon-hydrogen bonds and olefin are not remained in the obtained product, and the product can be used as a single-phase cooling liquid of an immersed liquid cooling system of a data center to be applied to immersed cooling of the data center and has a wide application prospect.

The invention provides ionic liquid grafting modified high-temperature-resistant bio-based nylon as well as a preparation method and application thereof, and belongs to the technical field of bio-based high polymer materials. After nylon 5T salt is subjected to prepolymerization reaction, imidazolium ionic liquid is added for final polymerization, and the ionic liquid grafting modified high-temperature-resistant bio-based nylon is obtained. In the polymerization process, the imidazole ionic liquid enters a polyamide macromolecular chain, so that the intermolecular acting force can be reduced, and the molecular chain spacing can be increased, thereby reducing the melting point of the bio-based nylon, increasing the flowability of the bio-based nylon and improving the thermal property, crystallization and other behaviors of the bio-based nylon; the processing stability and the spinning performance of the bio-based nylon in the later period are effectively improved, meanwhile, the energy consumption is reduced, and the bio-based nylon with high strength, high orientation and high crystallization is obtained.

The invention discloses a perovskite solar cell and a preparation method thereof, and a photovoltaic module, the perovskite solar cell comprises a substrate, a hole extraction layer, a perovskite layer, an electron transport layer and a first electrode which are sequentially laminated, the material of the hole extraction layer comprises R-2Ph-xPACz, and the structure of R-2Ph-xPACz is shown as a formula 1: # imgabs0 #, r is any one of CH3CH2O, CH3O, (CH3) 3C or a heterocyclic ring containing lone pair electrons, and x is 2-10. The R-2Ph-xPACz disclosed by the invention is relatively good in hole extraction and transmission effect and excellent in spreading uniformity, and the energy conversion efficiency of the solar cell can be further improved.

The present application relates to a kind of electrolyte additives and its preparation method, belong to electrolyte technical field;The present application uses propenyl-1,3-sulfonic acid lactone as raw material, using the double bond of propenyl-1,3-sulfonic acid lactone and the amino group of 4-amino-2-(trifluoromethyl) thiophene occurs Michael addition reaction under the catalysis of 1,8-diazabicyclo (7-ene) Undecane, obtain the intermediate with tertiary amine structure, then through the quaternary ammonium salt reaction of tertiary amine structure of intermediate and bromo atom of ethyl bromoacetate, obtain additive, the additive of the present application and phosphate ester additive are compounded to obtain electrolyte additive, the present application is modified by propenyl-1,3-sulfonic acid lactone, introduce fluorinated alkyl, effectively reduce intermolecular force, weaken the dependence of electrolyte viscosity on temperature, improve the ionic conductivity of electrolyte under low temperature condition.

A low-shrinkage polyethylene sheathing material, a method for preparing the same, and an application thereof. The low-shrinkage polyethylene sheathing material comprises the following weight percentages of components: LLDPE resin of 35-45%, MDPE resin of 20-25%, HDPE resin of 4-15%, elastomer of 4-15%, inorganic powder material of 2-15%, compatibilizer of 1-13%, black masterbatch of 4.7-5.7%, lubricant of 0.2-1%, antioxidant of 0.3-0.5%, and light stabilizer of 0.1-0.6%. The low-shrinkage polyethylene sheathing material provided by the present invention overcomes the problem of high cable shrinkage rate of commonly used polyethylene sheathing materials. The obtained sheathing material has basically no shrinkage phenomenon after high and low temperature cycling, and has excellent processing and mechanical properties.

The invention relates to the technical field of transformer oil, and provides an additive for reducing the pour point of plant-based transformer oil and a preparation method thereof.The additive is prepared from an alcoholysis modified copolymer, an alpha-olefin copolymer, a turmeric rhizome extract and a low-molecular-weight ester viscosity modifier, wherein the alcoholysis modified copolymer is obtained by modifying a norbornic anhydride-methyl tetradecyl ester copolymer with octadecanol; the norbornene anhydride-methyl tetradecyl ester copolymer is a copolymer obtained by reacting norbornene anhydride and tetradecyl methacrylate; the alpha-olefin copolymer is a copolymer obtained by reacting alpha-pinene and dodecene. In the additive disclosed by the invention, the alcoholysis modified copolymer inhibits wax crystal aggregation, the alpha-olefin copolymer optimizes the viscosity-temperature characteristic of an oil product, the turmeric rhizome extract enhances oxidation resistance, the low-molecular-weight ester viscosity modifier improves dispersity and flowability, and the pour point and viscosity of the plant-based transformer oil can be remarkably reduced under the synergistic effect of multiple components; the low-temperature fluidity and the comprehensive performance are improved.

The invention relates to a method for preparing a stable polymer-colloid composite photonic crystal by using a crosslinkable polymer, and belongs to the field of ordered polymer matrix composite materials. A compound containing double bonds reacts with a polymer with high molecular weight under a certain condition to obtain a polymer with modified double-bond groups. Monodisperse colloid particle dispersion liquid and the polymer modified with the double-bond groups are compounded, a compound is subjected to oscillation shearing, a composite film with bright structural color is obtained, crosslinking is achieved through polymerization of the double-bond groups, and therefore the polymer-colloid composite film with the stable structure is obtained. According to the invention, the polymer-colloid composite photonic crystal which has bright structural color and can be cross-linked is obtained by utilizing the dynamic reversible interaction of supramolecules. The polymer-colloid composite photonic crystal with a stable structure is obtained through crosslinking. The method is simple to operate and low in cost, has the potential of large-scale industrial production, and shows a good application prospect in the fields of display, sensing and anti-counterfeiting.

The application discloses an ecological and environment-friendly biodegradable fiber and a preparation method thereof. The method is that first, β-cyclodextrin and polyvinyl alcohol (PVA) are subjected to a copolymerization reaction to obtain plasticized modified PVA, then the plasticized modified PVA is used as a skin layer material of the fiber, PBS is used as a core layer material, and the ecological and environment-friendly biodegradable fiber is prepared through a coaxial skin-core spinning method. The ecological and environment-friendly biodegradable fiber prepared by the method has excellent mechanical properties, has the advantage of controllable degradation compared with existing PBS fibers, and has wide market application potential in the field of soft home furnishing which has high requirements on degradation performance.

The invention discloses an internal demoulding polyurethane composite material as well as a preparation method and application thereof, and belongs to the technical field of polyurethane materials. The composite material is prepared by mixing and curing a first component (modified polyurethane containing side chain carboxyl and end group double bonds) and a second component (cyclic polyurethane). The first component is prepared through ring opening esterification of itaconic anhydride, introduced side chain carboxyl effectively reconstructs a hydrogen bond network to enhance the mechanical strength, and end group double bonds promote demolding components to efficiently migrate to a mold interface; the unique end-group-free topological structure of the second component effectively limits excessive slippage of a macromolecular chain segment, and the demolding component is permanently and stably anchored at an interface. The composite material effectively solves the problems that a traditional composite material is difficult to demould and the mechanical property is difficult to consider at the same time, realizes an excellent and lasting internal demoulding effect, greatly improves the tensile strength and toughness of the material, and is especially suitable for preparation of composite materials such as PHC cover plates of automobile trunks and the like.

This invention relates to the field of polymer materials technology, and more particularly to a polyamide-imide polymer, its preparation method, and its applications. This invention uses a polyamide-imide polymer having the structure shown in Formula I to prepare a polyamide-imide film. The polyamide-imide polymer uses 2,2'-di(trifluoromethyl)diaminobiphenyl as a diamine monomer and 5,5'-(1,4-phenylene)bis[hexahydro-4,7-methanolisobenzofuran-1,3-dione] as an anhydride monomer, which is copolymerized with terephthaloyl chloride in different proportions and 2,2'-di(trifluoromethyl)diaminobiphenyl to obtain the polyamide-imide polymer, and then to prepare the polyamide-imide film. The PAI film prepared by this invention has high visible light transmittance, low coefficient of thermal expansion and mechanical properties, and good solubility in most organic solvents, making it easy to process and showing broad application prospects in the optoelectronic field.

The invention belongs to the technical field of nanostructure manufacturing, and discloses a metal nanoarray structure prepared on graphene in an in-situ controllable mode and a preparation method thereof.The preparation method comprises the steps that a silicon wafer serves as a substrate, and a graphene layer is prepared on the silicon substrate through a mechanical stripping method; a silicon cantilever beam containing raw material molecules is installed on an atomic force microscope to scan the prepared substrate, a high-resolution surface topography image is generated, and after a flat position without obvious defects is selected according to the topography image, the tip of the silicon cantilever beam makes contact with the graphene or the surface of the silicon substrate; and then positive voltage is applied to the tip, the retention time and the load are adjusted, so that the metal nanometer material is deposited near the tip, and a metal nanometer array structure is formed. By means of the method, in-situ controllable manufacturing of the size, the morphology, the composition, the structure and the position of the metal particles on the surface of the graphene can be achieved. Therefore, the material can be better popularized and applied in the technical fields of electronics, optics, catalysis, sensing, field emission, display devices and the like.