摘要:
The subject of the present invention is a process for preparing a precomposite based on nanotubes, comprising bringing said nanotubes into contact with at least one given plasticizing agent.It also relates to a precomposite thus obtained, and to its use for conferring at least one electrical, mechanical and/or thermal property on a polymer material.It also relates to the use of a given plasticizer for improving the dispersion and/or mechanical properties and/or electrical conductivity and/or thermal conductivity of nanotubes in a polymer matrix.
摘要:
The present invention relates to a composite of carbon nanotubes and of graphenes in agglomerated solid form comprising: a) carbon nanotubes, the content of which represents from 0.1% to 50% by weight, preferably from 10% to 40% by weight relative to the total weight of the composite; b) graphenes, the content of which represents from 0.1% to 20% by weight, preferably from 1% to 10% by weight relative to the total weight of the composite; and c) a polymer composition comprising at least one thermoplastic polymer and/or one elastomer. The present invention also relates to a process for preparing said composite, its use for the manufacture of a composite product, and also to the various applications of the composite product.
摘要:
A fluid transport tube comprising at least an inner layer, an outer protective layer, and an intermediate temperature regulator device connected to a source of voltage and suitable for heating the transported fluid towards an equilibrium or reference temperature by using a positive temperature coefficient thermistor presenting electrical resistance that is automatically controlled by temperature and that is connected to the source of voltage via at least two conductor elements delivering the current needed for heating it, wherein each conductor element is a metal wire that is supported by a textile ply wound around the inner layer of the tube, and wherein said inner layer is based: on at least one elastomer; or on at least one thermoplastic elastomer selected from the group consisting of ionomers and olefin-based thermoplastic elastomers having a cross-linked elastomer phase.
摘要:
Inorganic curable systems, such as cements, plasters, ceramics, or liquid silicates, which can be used, for example, in the fields of building, construction, or the oil-drilling industry. The use of carbon nanofillers for reinforcing the mechanical properties of such systems and for improving the latter. A method for inserting carbon nanofillers, such as carbon nanotubes, in the form of a binder master batch, into an inorganic curable system with a view to preparing composite materials having improved properties.
摘要:
The process of the present invention is a process to make a conductive fluorinated polymer composition (also called composite) wherein: a) an aqueous solution of an anilinium salt is mixed with an aqueous dispersion of a fluorinated polymer, b) then an oxidant is added to the mixture of step a) to make a blend of said fluorinated polymer and doped polyaniline (PANI), c) by-products and unreacted aniline are removed by washing with water or an alcohol to get a blend of purified fluorinated polymer and doped PANI, d) eventually the purified fluorinated polymer and doped PANI of step c) can be mixed with an acid, e) water is removed from the purified fluorinated polymer and doped PANI of step c) or d) if any and the remaining powder is melted and shaped in films, pellets or any object.
摘要:
The present invention relates to a composite material comprising, by weight, the total being 100% : A) 40 to 90% of PVDF homopolymer or copolymer crystallized essentially in the &bgr; form, B) 10 to 60% of a conductive filler, C) 0 to 40% of a crystalline or semi-crystalline polymer, D) 0 to 40% of a filler other than C, such that the crystals in the &bgr; form are nucleated on the surface of the particles of the conductive filler. This material is conductive with a resistance which is self-regulated by the temperature. It shows an increase in the resistance as a function of the temperature (PTC or “Positive Temperature Coefficient” effect), so that the intensity stabilizes at an equilibrium temperature.
摘要:
A composite material including, in a polymeric composition, carbon nanotubes combined with particles having an elastomeric core and at least one thermoplastic shell. The composite material including, in a polymer composition, carbon nanotubes associated, so as to form aggregations of less than 30 μm, with particles having a core made of totally or partially crosslinked elastomer and at least one thermoplastic shell, in a weight ratio of the particles of core-shell structure to the nanotubes of between 0.5:1 and 2.5:1. Also, a method for preparing said material, as well as to the use thereof for imparting various properties to polymeric matrices.
摘要:
A method for producing a fibrous material including carbon fibres or glass fibres or plant fibres or polymer-based fibres, that are used alone or in a mixture, and are impregnated by a thermohardenable polymer using a mixture containing a hardener and carbon nanofillers, such as carbon nanotubes (CNT). A mixture containing said nanofillers, such as CNTs, and the hardener is used to introduce said nanofillers into the fibrous material. A continuous production line (L) for producing the material in the form of at least one calibrated and homogeneous strip (20) of reinforcing fibres impregnated with a thermohardenable polymer, includes the device (100) for arranging two series of fibres (1, 2) used to form a strip in such a way as to arrange the two series of fibres such that they are brought into contact with each other by means of two calendering devices.
摘要:
The invention relates to a method for manufacturing a thermoplastic composition including: a polyester resin (c); a mixture including a copolymer (a) of an α-olefin and of a monomer having an ethylenic unsaturation and an epoxy function, as well as a core-shell compound (b); characterized in that said method includes a first step of manufacture the mixture of (a) and (b) by extrusion at a temperature at which the copolymer (a) is in the molten state and at a maximum temperature of 60 to 180° C.; a second step of manufacturing the thermoplastic composition by extrusion or by mixing the polyester resin (c) with the mixture of (a) and (b) produced in the first step.
摘要:
The present invention relates to a multilayer conductive fiber having a core/shell structure, wherein the core contains nanotubes, in particular carbon nanotubes. The invention also relates to a method for producing said fiber by coextrusion and to the uses thereof The invention finally relates to a composite material including the aforementioned multilayer composite fibers bonded together by weaving or using a polymer matrix.