Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Franck Jousse

Pierrick Buvat

Philippe Mazabraud

Christian Levassort

Laurent Delnaud

Didier Marsacq

Alexia Balland-Longeau

Pierre Baurens

Marc Calonne

Jean-Felix Salas

Jean-Marie Catala

Abbas Tcharkhtchi

Mark Kearns

Eric Bourgeoisat

Jean-Félix Salas

Béatrice Icard

A cylindrical element is manufactured by a process which includes depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers, the cycle including at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240&#xb0; C. The cylindrical element contains at least one layer containing an ethylene-vinyl alcohol copolymer with a density at the above temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.

Method for making a part with clearance volume by rotational moulding and resulting part

A conducting composite material is composed of a kneaded and compressed mix. The mix includes (a) from 40 to 90% by volume of a flake graphite powder comprising a flake graphite type formed from graphite particle agglomerates bonded to each other and superposed such that their principal planes are parallel to each other, these agglomerates having a planar anisotropy with side dimensions between 10 &#x3bc;m and 1 mm and between 5 and 50 &#x3bc;m thick, (b) from 0 to 25% by volume of conducting fibres, and (c) from 10 to 40% by volume of an organic binder. This material can be used for making electrodes for fuel cells.

Conductive composite material and fuel cell electrode using same

The invention relates to a process for the preparation of poly(&#x3b1;-methylstyrene) by anionic polymerization of the &#x3b1;-methylstyrene monomer, said process successively comprising the following stages:

Method for the preparation of poly sg(a)-methylstyrene

This invention relates to a composite conducting material comprised of a mixture of flake graphite and thermoplastic polymer powder sintered at high pressure that can be used for realizing a fuel cell electrode. The mixture comprises a first type of flake graphite composed of flakes having a granulometry between 10 and 100 &#x3bc;m and/or a second type of flake graphite comprised of clusters of particles of graphite linked and superimposed upon each other in such a fashion that their principal planes are parallel to each other; said clusters having a planar anisotropy and having between 10 &#x3bc;m and 1 mm in length and between 5 and 50 &#x3bc;m in thickness, the mixture also comprising a thermoplastic polymer powder having a granulometry between 10 and 200 &#x3bc;m, the flakes and/or the clusters having their principal planes parallel to each other.

Conductive composite material and electrode for fuel cell using said material formed by thermo-compression

A multi-layer thermoplastic structure that has at least one layer that is between 0.3 and 20 mm thick and is made of an ethylene-vinyl alcohol copolymer with a density of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes at a temperature between 170 and 240 degree C. The multi-layer thermoplastic structure is obtained by rotation moulding and is of particular benefit when functioning as a gas tank.

Multilayer thermoplastic structure for gas tank

The present invention relates to polymers of poly(ethynylene phenylene ethynylene silylene) type comprising an inert spacer in the main chain of the polymer. The invention also relates to processes for preparing said polymers and to the cured products that may be obtained by heat-treating said polymers. The polymers according to the invention may be used especially in matrices for composites.

Poly(ethylene phenylene ethynylene silylenes) comprising an inert spacer and methods for preparing same

Heat-stable poly(ethynylene phenylene ethynylene polysiloxene(silylene)) polymers preferably of determined molecular mass, optionally bearing at the end of the chain groups derived from a chain-limiting agent. Processes for preparing these polymers, cured products obtained by heat-treating these polymers, and composite matrices comprising these polymers.

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Tours, France

Franck Jousse