Abstract:
The présent invention pertains to the use of nanotubes of at least one chemical élément chosen from éléments of groups IHa, IVa and Va of the periodic table to improve the high température mechanical properties of a polymeric matrix comprising at least one semi-crystalline thermoplastic polymer.
Abstract:
Multi-layer polyelectrolyte membranes are described wherein at least one of the layers contains at least one acrylic resin or vinyl resin having at least one ionic or ionizable group, and at least one additional polymer. The polymer has small or large domain sizes with respect to he acrylic resin or vinyl resin that is present in one or more layers. The polymer preferably has improved conductivity when formed formed into a film. The membranes are useful in batteries, fuel cells, and the like.
Abstract:
The invention relates to a method of manufacturing fibres made of a composite based on a thermoplastic polymer and conducting or semiconducting particles, which includes a heat treatment, said heat treatment consisting in heating the composite, by progressively raising the temperature, having the effect of improving the conducting properties of the fibres obtained or of making the initially insulating fibres conducting. The invention also relates to the conducting fibres thus obtained and in particular to polyamide fibres and carbon nanotubes.
Abstract:
Multi-layer polyelectrolyte membranes are described wherein at least one of the layers contains at least one acrylic resin or vinyl resin having at least one ionic or ionizable group, and at least one additional polymer. The polymer has small or large domain sizes with respect to he acrylic resin or vinyl resin that is present in one or more layers. The polymer preferably has improved conductivity when formed formed into a film. The membranes are useful in batteries, fuel cells, and the like.
Abstract:
A pair of nasal prongs (15), suitable for insertion into the lower portion of the nares, join together via a small plenum chamber (16) to form a single tube (17) conveying the nasal pressure towards an electrical pressure transducer (19). Another prong (20) is held in proximity with the patient's mouth. A baffle element (25) extends downwards from a location above the open end of the prong (20) to redirect a portion of oral airflow. The oral tube (21) extends towards the electrical pressure transducer (19), and conjoins with the nasal tube (17) at a junction (22) to form a common tube (18) connected to the pressure transducer (19). The relative lengths and/or diameters of the nasal tube (17) and the oral tube (21) are arranged so that the respective pneumatic impedances are different, so that the contributions of respiratory airflow from each of said tubes (17, 21) are substantially equal.
Abstract:
La présente invention a pour objet un procédé de préparation d'un matériau composite, renfermant de préférence de 10 à 50% en poids de nanotubes, comprenant : (a) l'introduction, dans un mélangeur, de nanotubes et d'au moins un polymère thermoplastique, tel qu'un homo- ou copolyamide, un polycarbonate, un SBM ou un PEG, (b) la fusion du polymère thermoplastique, et (c) le mélange du polymère thermoplastique fondu et des nanotubes, étant entendu qu'un plastifiant est introduit en amont de, ou dans, la zone de fusion du polymère. Elle se rapporte également au matériau composite ainsi obtenu, ainsi qu'à son utilisation pour la fabrication d'un produit composite.
Abstract:
L'invention concerne un procédé de fabrication de fibres en matériau composite à base de polymère thermoplastique et de particules conductrices ou semi conductrices, comprenant un traitement thermique, le dit traitement thermique consistant en une chauffe du matériau composite, réalisée avec une montée progressive de la température ayant pour effet d'améliorer les propriétés conductrices des fibres obtenues ou de rendre conductrices des fibres initialement isolantes. L'invention concerne également les fibres conductrices ainsi obtenues et en particulier des fibres en polyamide et nanotubes de carbone.
Abstract:
The présent invention pertains to the use of nanotubes of at least one chemical élément chosen from éléments of groups IHa, IVa and Va of the periodic table to improve the high température mechanical properties of a polymeric matrix comprising at least one semi-crystalline thermoplastic polymer.
Abstract:
The invention relates to a method for producing a composite material, that comprises : a- preparing a carbon nanotube-based master mixture according to a method that comprises: mixing the carbon nanotubes in the form of a powder and at least one thermoplastic and/or elastomer polymer matrix in the form of a powder, the amount of carbon nanotubes representing from 2 to 30 wt % relative to the total weight of the powdery mixture; and implementing said mixture into an agglomerated solid physical form; and B- placing said master mixture into a thermoplastic and/or elastomer polymer mixture. The invention also relates to the use of the above master mixture for implementing said method.
Abstract:
La présente invention a pour objet un procédé de fabrication d'un matériau composite comprenant : A- la préparation d'un mélange-maître à base de nanotubes de carbone suivant un procédé comprenant : le mélange de nanotubes de carbone sous forme de poudre et d'au moins une matrice polymérique thermoplastique et/ou élastomérique sous forme de poudre, la quantité de nanotubes de carbone représentant de 2% à 30% en poids, par rapport au poids du mélange pulvérulent total; et la mise en œuvre dudit mélange sous une forme physique solide agglomérée, et B- l'introduction dudit mélange-maître dans une composition de polymère thermoplastique et/ou élastomérique. Elle se rapporte également à l'utilisation du mélange-maître précité pour la mise en oeuvre de ce procédé.