Abstract:
Provided is a process for producing silicate-comprising polyols, comprising (i) admixing an aqueous silica sol (K) having an average particle diameter 1-150 nm, silica content 1-60% by weight and a pH of 1-6, with a 0.1- to 20-fold amount of at least one organic solvent (L), (ii) admixing the resulting mixture with a polyol, (iii) removing at least partially water and the organic solvent (L) by distillation, (iv) admixing with 0.1-30 mol % of at least one compound (S) which has at least one at least monoalkoxylated silyl group and at least an alkyl, cycloalkyl or aryl substituent, which may contain heteroatoms, wherein the substituent optionally contains a group reactive toward an alcohol, an amine or an isocyanate, and (v) optionally adjusting the pH of the silicate-comprising polyol to 7-12 by addition of a basic compound.
Abstract:
The novel polyamide fibers with dyeable particles comprise 80% to 99.95% by weight of polyamide, 0.05% to 20% by weight of dyeable particles and 0% to 19.95% by weight of added substances, the % by weight summing to 100%.
Abstract:
In the thermoelectric module composed of p- and n-conductive thermoelectric material legs which are connected to one another alternately via electrically conductive contacts, at least some of the electrically conductive contacts on the cold and/or the warm side of the thermoelectric module are formed between, or embedded into, the thermoelectric material legs composed of porous metallic materials.
Abstract:
Thermoplastic molding compositions, comprising A) from 10 to 99.999% by weight of a polyimide B) from 0.001 to 20% by weight of iron powder with a particle size of at most 10 μm (d50 value), which is obtainable via thermal decomposition of pentacarbonyliron, C) from 0 to 70% by weight of further additives, where the total of the percentages by weight of components A) to C) is 100%.
Abstract:
A layered structure comprising in this order: (A) a silicon carbide layer, (B) at least one stratum (b1) located at least one major surface of the silicon carbide layer (A), (b2) chemically bonded to the bulk of the silicon carbide layer (A) by silicon-oxygen and/or silicon-carbon bonds, (b3) covering the at least one major surface of the silicon carbide layer (A) partially or completely, and (b4) having a higher polarity than a pure silicon carbide surface as exemplified by a contact angle with water which is lower than the contact angle of water with a pure silicon carbide surface; and (C) at least one dielectric layer, which covers the stratum or the strata (B) partially or completely and is selected from inorganic and inorganic-organic hybrid dielectric layers; a process for its manufacture and its use.
Abstract:
In the thermoelectric module composed of p- and n-conductive thermoelectric material legs which are connected to one another alternately via electrically conductive contacts, at least some of the electrically conductive contacts on the cold and/or the warm side of the thermoelectric module are formed between, or embedded into, the thermoelectric material legs composed of porous metallic materials.
Abstract:
The present invention relates to a process for preparing transparent conductive oxides, comprising the following steps in the sequence of a-b-c:(a) reaction of at least one starting compound (A) comprising at least one metal or semimetal M and optionally of a dopant (D) comprising at least one doping element M′, where at least one M′ is different than M, in the presence of a block copolymer (B) and of a solvent (C) to form a composite material (K), (b) optional application of the composite material (K) to a substrate (S) and (c) heating of the composite material (K) to a temperature of at least 350° C., wherein the block copolymer (B) comprises at least one alkylene oxide block (AO) and at least one isobutylene block (IB). The present invention further relates to the transparent conductive oxides thus obtainable, and to their use in electronic components, as an electrode material and as a material for antistatic applications. The present invention finally relates to electronic components comprising the transparent conductive oxides.
Abstract:
The present invention relates to a process for producing metal oxide nanofibers using a sol-gel precursor. The nanofibers produced by the process according to the invention are notable for an increased metal oxide content compared to the prior art.
Abstract:
Thermoplastic molding compositions, comprisingA) from 10 to 99.999% by weight of a polyimideB) from 0.001 to 20% by weight of iron powder with a particle size of at most 10 μm (d50 value), which is obtainable via thermal decomposition of pentacarbonyliron,C) from 0 to 70% by weight of further additives, where the total of the percentages by weight of components A) to C) is 100%.
Abstract:
Process for producing silicate-comprising polyols, which comprises the steps (i) admixing of an aqueous silica sol (K) having an average particle diameter of from 1 to 150 nm and a silica content, calculated as SiO2, of from 1 to 60% by weight and having a pH of from 1 to 6, based on the SiO2 content used, with a 0.1- to 20-fold amount (based on the amount of water) of at least one organic solvent (L) selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-2-propanol, 1-chloro-2-propanol, cyclopentanol, cyclohexanol, 1,4-dioxane, tetrahydrofuran, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, 2-ethoxyethanol, 2-methyl-2-propanol, 2-methoxyethanol, dimethylformamide, acetonitrile, dimethyl sulfoxide and acetone, methyl ethyl ketone and ethylacetate, and (ii) admixing of the resulting mixture with a polyol, (iii) at least partial removal of the water and organic solvent (L) by distillation, (iv) admixing with at least one compound (S) which has at least one at least monoalkoxylated silyl group and at least an alkyl, cycloalkyl or aryl substituent, which may contain heteroatoms, wherein this substituent optionally contains a group which is reactive toward an alcohol, an amine or an isocyanate, in an amount of from 0.1 to 20 μmol of (S) per m2 of surface area of (K), with the steps (i), (ii) and (iv) being able to be carried out simultaneously or in succession in any order, (v) optionally adjustment of the pH of the silica-comprising polyol to a value of from 7 to 12 by addition of a strongly basic compound, with step (v) also being able to be carried out between steps (iii) and (iv).