Abstract: A method of preparing a transparent polymer material includes i) obtaining composite nanoparticles having mineral nanoparticles at least partially coated with at least one monomer and/or at least one polymer suitable for promoting physicochemical interactions at the interface between the mineral nanoparticles and a thermoplastic polycarbonate matrix, the mineral nanoparticles being surface-modified by the monomer and/or the polymer, either directly by grafting or directly by adsorption of the monomer and/or polymer onto the surface of the mineral nanoparticles; or via a coupling agent selected from a chlorosilane or an organosilane including a functional group that is capable of reacting by a radical pathway. The composite nanoparticles obtained in step i) are mixed with the thermoplastic polycarbonate matrix in the molten state to obtain the transparent polymer material.

Abstract: The present invention provides a method of preparing a transparent polymer material, the method comprising steps i) and ii) in any order, the steps consisting in: i) mixing: mineral nanoparticles having a form factor strictly greater than 1.0; and a polymer matrix comprising a quantity of at least 80% by weight of a polycarbonate (PC) first thermoplastic polymer and of a second transparent thermoplastic polymer other than the first thermoplastic polymer, in order to obtain a mixture; and ii) heating the polymer matrix to the molten state, on its own or in the mixture; to obtain the transparent, polymer material, the mixture of step i) comprising a quantity of mineral nanoparticles having a form factor strictly greater than 1.0 that is strictly less than 5% by weight.

Abstract: The present invention provides a method of preparing a transparent polymer material, the method comprising steps i) and ii) in any order, the steps consisting in: i) mixing: mineral nanoparticles having a form factor strictly greater than 1.0; and a polymer matrix comprising a quantity of at least 80% by weight of a polycarbonate (PC) first thermoplastic polymer and of a second transparent thermoplastic polymer other than the first thermoplastic polymer, in order to obtain a mixture; and ii) heating the polymer matrix to the molten state, on its own or in the mixture; to obtain the transparent, polymer material, the mixture of step i) comprising a quantity of mineral nanoparticles having a form factor strictly greater than 1.0 that is strictly less than 5% by weight.

Abstract: A method of preparing a transparent polymer material includes i) obtaining composite nanoparticles having mineral nanoparticles at least partially coated with at least one monomer and/or at least one polymer suitable for promoting physicochemical interactions at the interface between the mineral nanoparticles and a thermoplastic polycarbonate matrix, the mineral nanoparticles being surface-modified by the monomer and/or the polymer, either directly by grafting or directly by adsorption of the monomer and/or polymer onto the surface of the mineral nanoparticles; or via a coupling agent selected from a chlorosilane or an organosilane including a functional group that is capable of reacting by a radical pathway. The composite nanoparticles obtained in step i) are mixed with the thermoplastic polycarbonate matrix in the molten state to obtain the transparent polymer material.

Abstract: A fuel cell system including a mechanism supplying hydrogen to the anode of the cell, a mechanism supplying oxygen to the cathode of the cell, and a control unit. A first control controls the hydrogen supply to the anode of the cell and a second control controls the oxygen supply to the cathode of the cell. A further mechanism determines hydrogen over-stoichiometry in an anodic oxidation half-reaction and a further mechanism determines oxygen over-stoichiometry in a cathodic reduction half-reaction. The first and second controls can adapt hydrogen and oxygen over-stoichiometry of the cell respectively as a function of the required cell power.

Abstract: An electric motive power system for a motor vehicle including a fuel cell having at least one set of two electrodes each provided with an electrode input and output, an electrolytic membrane being located between the two electrodes. The electrolytic membrane includes proton conductive charges distributed in the thickness of the membrane in accordance with a concentration gradient, to concentrate the water in liquid form produced by the fuel cell on one of the electrodes, and wherein the water in liquid form thus concentrated is evacuated from the fuel cell through a single electrode output.

Abstract: A method and a device for operational control of fuel cell modules, in particular, to maintain the lifespan thereof. The electrochemical cells of the fuel cell are electrically connected to a junction box by plural modules such that control density is maintained for a given period with a weak charge and a duration of operation of a module is used such as to increase the lifespan of the fuel cell.

Abstract: The invention concerns a fuel cell with non-fluorinated or partly fluorinated membrane wherein said membrane comprises a non-fluorinated or partly fluorinated polymer and an antioxidant for protecting said polymer against the free radicals formed. The invention also concerns methods for obtaining such fuel cells.

Abstract: An electric motive power system for a motor vehicle including a fuel cell having at least one set of two electrodes each provided with an electrode input and output, an electrolytic membrane being located between the two electrodes. The electrolytic membrane includes proton conductive charges distributed in the thickness of the membrane in accordance with a concentration gradient, to concentrate the water in liquid form produced by the fuel cell on one of the electrodes, and wherein the water in liquid form thus concentrated is evacuated from the fuel cell through a single electrode output.