20 results about "Molar mass" patented technology

The invention relates to a method for pulling a single crystal from a melt consisting of silicon and a dopant according to the Czochralski method, comprising the following steps in a given sequence: a) performing a time-dependent computer simulation of a predetermined crystal pulling process having a predetermined dopant concentration (C) in the melt, with the aim of obtaining a temperature gradient and a dopant gradient for each time increment t, wherein the two gradients are determined at the interface between the crystal and the melt in the normal direction of the melt interface, b) determining a maximum dopant concentration (Cmax) in the melt, and c) pulling up a single crystal having a dopant concentration less than the determined maximum dopant concentration (Cmax), characterized in that a parameter (CS) is calculated for each time increment t, which is determined by formula, wherein the parameter fCS is determined from the product of the average concentration (C) of the dopant in the melt, the density of the silicon melt, the Avgamde constant, the molar mass of the silicon and the slope of the liquidus, and then generating an average value of the values obtained for the parameter (CS) wherein only those values having the (CS) value less than zero are included, and determining the maximum dopant concentration (Cmax) by adapting the above defined dopant concentration (C) until the magnitude equals zero.

The invention relates to a two-component thermally conductive composition comprising: a composition (A) comprising: a silylated polymer, and a rheology agent (r1) selected from amide waxes and / or a rheology agent (r2) comprising: from 1% to 40% by weight of a bis-urea (a) obtained by reacting a primary aliphatic amine with a diisocyanate of molar mass less than 500 g / mol, relative to the total weight of the rheology agent (r2), and from 60% to 99% by weight of a specific plasticizer (b), relative to the total weight of the rheology agent (r2), said rheology agent (r2) being in the form of a suspension of solid particles of the bis-urea (a) in a continuous phase of plasticizer (b), and a composition (B) comprising: at least 1% by weight of a filler (C) relative to the total weight of the composition (B), the filler (C) contributing at least 0.0025% by weight of moisture relative to the total weight of the composition (B),Composition (A) and / or composition (B) further comprising at least one thermally conductive filler. The invention also relates to the use of a filler (C) having a specific moisture content for crosslinking, without the addition of free water, a two-component composition, the two-component composition comprising a composition (A) comprising a silylated polymer, and a composition (B) comprising said filler (C). Figure for the abstract: none.

The invention relates mainly to a polymer composition comprising: (a) 55% to 99%, preferably 60% to 95%, advantageously 65% to 90%, and in particular 70% to 85% by weight of polyether block amide (PEBA) having a ratio of the number-average molar mass of the polyamide blocks to that of the polyether blocks of 1.0 or less; (b) 1% to 45% by weight of a modifier selected from among: i. a thermoplastic elastomer in the form of a block copolymer with a ratio D of the number-average molar mass of the rigid blocks to that of the soft blocks of less than 0.8; ii. a crude or crosslinked rubber; and iii. combinations thereof; (c) 0% to 5% by weight of additives; and (d) 0% to 5% by weight of fillers, the sum of the percentages of components (a) to (d) adding up to 100%, and wherein the composition comprises less than 4% by weight of carbon black.

The invention discloses an improved method suitable for a'volatile substance molar mass determination 'experiment in a physical and chemical experiment established in a higher school. Comprising the following steps: S1, firstly, lapping a device, and replacing an original Meijoa method steam density measuring device with an improved two-mouth round-bottom flask and a soap film flowmeter; s2, replacing an original three-way piston with a T-shaped pipe; and S3, replacing glass bubbles with a medical injector sample injection mode. Experiment results show that the improved experiment is simple in operation and obvious in phenomenon, experiment cost and uncertainty are reduced, and the method is more suitable for grouping experiments of students.

The invention relates to a method for producing linear organopolysiloxanes OL by polymerization of organopolysiloxanes O (cyclic and / or linear) using a catalytic system AI. More specifically, the method of the present invention makes it possible to obtain a controlled molar mass linear organopolysiloxane OL with a very low residual ratio of cyclic organopolysiloxane. The present application also relates to linear organopolysiloxanes (OL) obtained according to various embodiments of the above process of the present invention.

The present invention is directed to a radical-curable coating composition comprising(A) One or more oligomers selected from the group consisting of urethane (meth)acrylates, (meth)acrylated epoxidized triglycerides and any mixture thereof, wherein said oligomers have a molar mass equal to or higher than 800 g / mol and lower than 4500 g / mol,(B) One or more methacrylate reactive diluents having a molar mass lower than 800 g / mol, wherein said methacrylate reactive diluents have an average methacrylate functionality higher than 2,(C) One or more acrylate reactive diluents having a molar mass lower than 800 g / mol, wherein said acrylate reactive diluents have an average acrylate functionality higher than 2,(D) One or more photo-initiators, and(E) One or more thermal initiators,wherein the acrylate functionalities of the acrylate reactive diluents (C) and the methacrylate functionalities of the methacrylate reactive diluents (B) are present in a molar ratio of the acrylate functionalities to the methacrylate functionalities of at least 0.2,wherein the amount of oligomers (A) is higher than 20 wt. % and lower than 90 wt. % and the amount of reactive diluents (B) and (C) is higher than 10 wt. % and lower than 80 wt. %, based on the total amount of (A), (B) and (C), andwherein the total amount of (A), (B) and (C) is at least 25 wt. % of the radical-curable coating composition.

There is a need for a novel heat-melt curable organopolysiloxane composition, etc. This invention provides a heat-melt curable organopolysiloxane composition comprising: (A) a chain-like organopolysiloxane having two or more alkenyl groups within its molecule; (B) an organopolysiloxane component selected from two or more components (B1) to (B3) that do not contain aliphatic unsaturated bonds: (B1) an organopolysiloxane resin containing R... 1 3SiO 1 / 2 (where R) 1 The siloxane unit (M unit) representing a monovalent organic group independently, and the siloxane unit (M unit) represented by SiO2. 4 / 2 The following are defined as follows: (A) a siloxane unit (Q unit), and the molar mass ratio of M unit to Q unit is in the range of 0.50 to 2.00; (B2) a linear or branched diorganopolysiloxane; and (B3) an organopolysiloxane resin, wherein the organopolysiloxane resin is formed by chemically linking components (B1) and (B2); (C) a monofunctional or polyfunctional vinyl monomer; and (D) a free radical polymerization initiator, wherein the ratio (R / P ratio) of the total mass R of component (B1) and component (B1) constituting component (B3) to the total mass P of component (A), component (B2) and component (B2) constituting component (B3) exceeds 1.80.

The application discloses a kind of based on electronic density and distribution uniformity Fractal dimension calculation method and general detection device, belong to material microstructure characterization technical field.The method determines material chemical formula unit total price electron number, theoretical dense density and molar mass, detects actual density and calculates porosity;Collect surface topography gray data, calculate electronic distribution uniformity by normalized variance;Total price electron number density is calculated, combined with fitting proportion coefficient, and the fractal dimension is obtained by general formula.The detection device uses modular architecture, including basic parameter input, density detection, uniformity acquisition, main control calculation and result output module, each module can be independently replaced, and the main control module is built-in core algorithm.The application does not need large microscopes, realizes fast, low-cost detection, adapts to various solid materials, wide protection range, easy industrialization, solves the problems of high cost, complicated process, poor universality and easy to avoid in prior art.

The stoichiometric formula of the high-entropy perovskite oxide doped ceramic is (1-x) Ca0. 5Sr0. 5TiO3-xNBBSC, and x is more than or equal to 0.05 and less than or equal to 0.2. The preparation method comprises the following steps: step 1, weighing and mixing original powder according to the molar mass percent of the chemical formula of Ca0. 5Sr0. 5TiO3 and NBBSC to form mixed powder A and mixed powder B; 2, the mixed powder A and the mixed powder B are subjected to ball milling, drying and presintering respectively, and Ca0. 5Sr0. 5TiO3 powder and NBBSC powder are obtained respectively; step 3, the Ca0. 5Sr0. 5TiO3 powder and the NBBSC powder are weighed according to the molar mass percentage of the chemical formula of (1-x) Ca0. 5Sr0. 5TiO3-xNBBSC, mixing, ball milling, drying and sieving are performed, and mixed powder C is obtained; and step 4, pressing the mixed powder C into a green body, and sintering the green body to obtain the (1-x) Ca0. 5Sr0. 5TiO3-xNBBSC ceramic. A high-entropy perovskite oxide NBBSC is introduced into a linear dielectric Ca0. 5Sr0. 5TiO3 matrix, and the NBBSC enters crystal lattices of Ca0. 5Sr0. 5TiO3 in a solid solution form to form a single solid solution, so that the dielectric property of the ceramic is modified and improved, the breakdown field strength of the ceramic is remarkably improved, and the ceramic obtains high energy storage density and high energy storage efficiency.

The present invention relates to a method for producing linear organopolysiloxane OL from organopolysiloxane O (cyclic and / or linear) by polymerization reaction using a catalytic system AI. More precisely, the method of the present invention makes it possible to obtain linear organopolysiloxane OL having a controlled molar mass with a very low residual cyclic organopolysiloxane. This application also relates to linear organopolysiloxane OL obtained according to various embodiments of the method of the present invention described above.

Method for degrading a vinyl polymer A method for degrading a vinyl polymer having an initial molar mass in order to form at least one degradation product having a final molar mass lower than the initial molar mass comprises a) providing a water-based emulsion of the vinyl polymer; b) mixing the water-based emulsion with at least one enzyme-mediator system to obtain a reaction mixture, said at least one enzyme-mediator system comprising at least one multi-copper oxidase chosen among a laccase, a laccase-ferroxidase, a laccase-like multi-copper oxidase or a mixture thereof, and at least one respective mediator, said at least one multi-copper oxidase and said at least one respective mediator being mixed sequentially with the water-based emulsion or provided as a pre-mix preserved under anaerobic conditions, until being mixed with the water-based emulsion; c) stirring the reaction mixture under an atmosphere comprising dioxygen; and d) recovering the at least one degradation product of the vinyl polymer.

The invention relates to a substrate comprising a surface of which at least one part is covered with an epilame agent, characterized in that said epilame agent comprises at least one compound in the form of a polymer soluble in a non-halogenated organic solvent and comprising units N, where N is formula (N), where R2, which may be identical or different, is H, a C1-C10 alkyl group, a C2-C10 alkenyl group; X, which may be identical or different, is a spacer arm; and L, which may be identical or different, is a group according to formula (I), where R6, R7 and R8, which may be identical or different, are H; a C1-C10 alkyl group; a C2-C10 alkenyl group; -(CH2)dOC(O)C(R9)=CH2, or a group according to formula (II), wherein at least one of R6, R7 and R8 is according to formula (II), where R9, which may be identical or different, is H, a C1-C10 alkyl group, a C2-C10 alkenyl group, d is selected from between 1 and 20, R10 and R11, which may be identical or different, are H, a C1-C10 alkyl group, a C2-C10 alkenyl group; R12, which may be identical or different, is H, a C1- C10 alkyl group, a C2-C10 alkenyl group, -(CH2)δO(CH2)εCH3, or (CH2)ψOC(O)C(R13)=CH2, where R13, which may be identical or different, is H, a C1-C10 alkyl group, a C2-C10 alkenyl group, δ is selected from between 1 and 20, ε is selected from between 0 and 20, ψ is selected from between 1 and 20; and y is at least 1 and is selected such that the molar mass of the L group is between 200 g / mol and 30,000 g / mol. The invention also relates to a method for coating such a substrate with epilame, and to a timepiece or piece of jewellery comprising a component that includes such a substrate.

The invention belongs to the technical field of element determination, and particularly relates to a method for determining the content of manganese in a manganese source. Comprising the following steps: dissolving a manganese source in a weakly acidic solution with a mass fraction of 4-8%, placing a sample solution on a test board of an automatic potentiometric titrator, adding a reducing agent solution under an acidic condition, adjusting the pH value to a weakly acidic condition, adding a complexing agent solution and a masking agent solution, and carrying out a mixed reaction; testing by adopting an equivalent titration mode, pre-adding an ethylenediaminetetraacetic acid standard titration solution into the pretreated sample solution, mixing, adding a buffer solution to adjust the pH value to 9.5-10.5, dropwise adding an indicator, titrating to the end point by using the ethylenediaminetetraacetic acid standard titration solution, and recording the consumed volume V1; and calculating the manganese content according to the concentration C of the standard titration solution, the consumption volume V1, the mass m of the manganese source and the molar mass M of manganese. Manual operation and subjective judgment errors are reduced, and repeatability and accuracy of results and overall detection efficiency are improved.

Method for degrading a vinyl polymer A method for degrading a vinyl polymer having an initial molar mass in order to form at least one degradation product having a final molar mass lower than the initial molar mass comprises a) providing a water-based emulsion of the vinyl polymer; b) mixing the water-based emulsion with at least one enzyme-mediator system to obtain a reaction mixture, said at least one enzyme-mediator system comprising at least one multi-copper oxidase chosen among a laccase, a laccase-ferroxidase, a laccase-like multi-copper oxidase or a mixture thereof, and at least one respective mediator, said at least one multi-copper oxidase and said at least one respective mediator being mixed sequentially with the water-based emulsion or provided as a pre-mix preserved under anaerobic conditions, until being mixed with the water-based emulsion; c) stirring the reaction mixture under an atmosphere comprising dioxygen; and d) recovering the at least one degradation product of the vinyl polymer.

This invention discloses a high-entropy perovskite oxide-doped ceramic with the stoichiometric formula (1- x )Ca 0.5 Sr 0.5 TiO3- x NBBSC, 0.05≤ x ≤0.2. The preparation method is as follows: Step 1, the raw powder is prepared according to Ca... 0.5 Sr 0.5 The molar mass percentages of TiO3 and NBBSC were weighed and mixed to form mixed powder A and mixed powder B; in step 2, mixed powder A and mixed powder B were ball-milled, dried, and pre-calcined respectively to obtain Ca 0.5 Sr 0.5 TiO3 powder and NBBSC powder; Step 3, Ca 0.5 Sr 0.5 TiO3 powder and NBBSC powder were mixed according to (1- x )Ca 0.5 Sr 0.5 TiO3- x Weigh, mix, ball-mill, dry, and sieve the NBBSC chemical formula by molar mass percentage to obtain mixed powder C; Step 4, press mixed powder C into a green body and sinter it to obtain (1- x )Ca 0.5 Sr 0.5 TiO3- x NBBSC ceramics. This invention utilizes linear dielectric Ca... 0.5 Sr 0.5 High-entropy perovskite oxide NBBSC is introduced into the TiO3 matrix, and NBBSC enters the Ca in a solid solution form. 0.5 Sr 0.5 TiO3 crystal lattice forms a single solid solution, thereby modifying and improving the dielectric properties of ceramics, significantly increasing the breakdown field strength of ceramics, and enabling ceramics to obtain high energy storage density and high energy storage efficiency.

A telechelic polymer of formula Z1-POLY-Z2 is provided. The term “POLY” denotes a polymer chain comprising units of a 1,3-diene, ethylene units and cyclic units, 1,2-cyclohexane units, Z1 and Z2 denoting a group containing a function, Z1 and Z2 being identical. The polymer has a macrostructure defined by a dispersity of less than 1.5 or by a number-average molar mass of greater than 10 000 g / mol.

Herein described is a composition comprising a bio-based phenol compound and a phenolic polymer having a number average molar mass (Mn) of from 200 to 1,500 g / mol, as well as an epoxy system comprising an epoxy resin and said composition. Further described is a composition comprising a bio-based phenol and a hydrocarbon resin.

The present invention relates to a process for coating surface-postcrosslinked superabsorbent particles, wherein the superabsorbent particles are coated at least with water and at least one polyethylene glycol having an average molar mass of 400 to 8000 g / mol.

The invention mainly relates to a footwear sole, in particular an outer sole, made of a composition comprising, by weight relative to the total weight of the composition: (a) 50% to 100% of at least one polyether block amide (PEBA) comprising polyamide blocks and polyether blocks, wherein the polyether blocks comprise on average at least 50% of polyether blocks, wherein the polyether blocks comprise on average more than 50% of ether units comprising at least 3 carbon atoms per oxygen atom; (b) 0 to 50%, preferably 5% to 40% and in particular 10% to 30% of fillers; and (c) 0 to 5%, preferably 0.1% to 4% and in particular 1% to 3% of additives, wherein the composition has a Shore hardness of less than 100A and a density greater than 0.85, and wherein the PEBA has a number-average molar mass Mn, as measured by size-exclusion chromatography according to the ISO 16014-1: 2019 standard, of between 10 000 and 70 000 g / mol.

The invention relates principally to a polymer composition comprising: (a) 55 to 99%, preferably 60 to 95%, advantageously 65 to 90%, and in particular 70 to 85% by weight of polyether block amide (PEBA) having a number-average molar mass ratio of polyamide blocks to polyether blocks less than or equal to 1.0; (b) 1 to 45% by weight of a modifier selected from: i. a thermoplastic elastomer in the form of a block copolymer with a number-average molar mass ratio D of rigid blocks to flexible blocks less than 0.8; ii. a rubber, raw or crosslinked; (c) 0 to 5% by weight of additives; and (d) 0 to 5% by weight of fillers, the sum of the percentages of components (a) to (d) adding up to 100%, and in which the composition comprises less than 4% by weight of carbon black.