摘要:
In microelectronic components and thick-film hybrid circuits, the multilayer substrates of the said components and the substrates of the said circuits are produced using liquid crystalline polymers which can be processed by a thermoplastic method.
摘要:
Wholly aromatic mesomorphic polyesters which form a liquid-crystalline fiber-forming melt below 320.degree. C. and are composed of(a) not less than 10 mol % of repeat units of the formula I ##STR1## (b) a molar amount equivalent to the total amount of components (c) and (d) of repeat units of the formula II ##STR2## (c) from 3 to 20 mol % of repeat units of the formulae III and/or IV ##STR3## and (d) from 5 to 30 mol % of repeat units of the formula V ##STR4## the molar proportions of components a, b, c and d adding up to 100 mol % in each case, the preparation thereof and moldings and coatings prepared therefrom.
摘要:
Poly(alkylene terephthalate) molding materials which contain, as the stabilizer, a diepoxide of molecular weight from 200 to 2,000, and a catalyst which is an alkali metal salt of a chelating agent possessing one or more --N(CH.sub.2 --COO.sup.-).sub.2 groups in the molecule. Preferred catalysts are trisodium nitrilotriacetate and tetrasodium ethylenediaminetetraacetate. The molding materials may be used for the manufacture of moldings, films, monofilaments and fibers.
摘要:
Composite materials consisting of heat-resistant thermoplastic polymers and metal oxide reinforcing fibers having diameters of less than 1000 nm are prepared by hydrolyzing an organometallic compound, preferably an aluminum alkoxide, in a melt or solution of the thermoplastic under the action of a high shear gradient.
摘要:
Wholly aromatic mesomorphic polyester amides which form a liquid-crystalline fiber-forming melt below 320.degree. C. and are composed of(a) from 3 to 30 mol % of repeat units of the formula ##STR1## (b) from 3 to 25 mol % of one or more of the repeat units of the formulae II, III and IV ##STR2## (c) a molar amount corresponding to the total amount of components (a) and (b) of repeat units of the formulae V and/or VI ##STR3## (d) repeat units of the formula VII ##STR4## (e) if desired from 5 to 25 mol % of repeat units of the formula VIII ##STR5## the mole percentages of components (a), (b), (c), (d) and (e) adding up to 100 mol % in each case, and the preparation and use thereof.
摘要:
For a process for reducing the thermal conductivity and for increasing the thermoelectric efficiency of thermoelectric materials based on lead chalcogenides or skutterudites, the thermoelectric materials are extruded at a temperature below their melting point and a pressure in the range from 300 to 1 000 MPa.
摘要:
The invention relates to a capacitor having a porous electrically conductive substrate on whose inner and outer surfaces a first layer of a dielectric and an electrically conductive second layer are applied.The invention also relates to a method for the production of such capacitors and to their use in electrical and electronic circuits.
摘要:
The invention relates to a photovoltaic cell and to a process for producing a photovoltaic cell comprising a photovoltaically active semiconductor material of the formula (I) or (II): ZnTe (I) Zn1-xMnxTe (II) where x is from 0.01 to 0.7, wherein the photovoltaically active semiconductor material comprises a metal halide comprising a metal selected from the group consisting of germanium, tin, antimony, bismuth and copper and a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine
摘要:
The invention relates to the thermally stable contacting of semiconductive alloys for use in thermoelectric generators and Peltier arrangements by means of soldering, and to processes for producing thermoelectric modules using a barrier layer composed of borides, nitrides, carbides, phosphides and/or silicides.
摘要:
Process for preparing barium titanate or strontium titanate by reacting titanium alkoxides with barium hydroxide hydrate or strontium hydroxide hydrate in a C1–C8-alcohol or a glycol ether at from 50 to 150° C.