Societe Nationale Industrielle Et Aerospatiale

Aerospatiale Societe Nationale Industrielle

Ciba-geigy Corporation

Daniel Beziers

Evelyne Chataignier

Bernard Boutevin

Yves Camberlin

Jean-Pierre Parisi

Patrick Noireaux

Patrice Dourthe

Claude Filliatre

Jean-Jacques Villenave

Christian Servens

Yannig Thomas

Veronique Dazens

The invention relates to the production of composite materials having a fibrous reinforcement and matrix obtained by the polymerization of acrylic monomers. These acrylic monomers are tetraacrylates of formula: ##STR1## in which R.sup.1 and R.sup.2, which can be the same or different, represent H or CH.sub.3, and Z is a divalent group having 1 or 2 aromatic or aliphatic cycles. For example, Z is a group derived from bisphenol A and R.sup.1 and R.sup.2 represent H. The composite materials can be prepared by injection moulding.

Composite material having a fibrous reinforcement and matrix obtained by

Process for the preparation of a polysilane crosslinked by ioning radiation and process for the production of a composite material having a polysilane matrix. The preparation process consists of subjecting to ionizing radiation chosen from among X-rays and an electron bombardment, a formulation crosslinkable by ionizing radiation incorporating at least one polysilane having at least one vinyl termination.

Process for the preparation of a polysilane crosslinked by ionizing

Prepolymers having imide groups

According to the invention, the reactive lubricating product of carbon fibres for embedding in a resin which can be hardened by X or beta radiation according to a radical mechanism is constituted by a monomer having at least one functional group (F.sub.1) able to form a covalent chemical bond with the hydroxyl sites of the carbon fibres and an ethylene unsaturation (F.sub.2) able to crosslink with the resin during its hardening under irradiation.

Batching process for treatment of carbon fibers

A part made of a resin-containing composite material, also having at least one insert made of a different material, is hardened by electron beam radiation in zones having a surface mass at the most equal to 4 g/cm.sup.2 and by X-radiation in zones having a surface mass above 4 g/cm.sup.2. The X-radiation, in doses up to 10 Mrad, is produced by action of the electron beam on a target placed between the part and the electron beam.

Process for the polymerization and/or crosslinking of a resin used in

Apparatus for the polymerization and/or crosslinking of a resin used in the composition of a composite material part having a variable thickness by means of ionizing radiation. The apparatus comprises means for producing an electron beam, means for directing the electron beam onto a target, which is able to produce under the action of the electron beam X-radiation offering adequate doses for crosslinking the resin, as well as means for carrying out a relative movement between the ionizing radiation and the part, so that the latter is wholly or partly exposed to the action of said radiation. It makes it possible to polymerize a part by X or electron beams, as a function of the thickness requirements thereof.

Apparatus for the polymerization and/or crosslinking of a resin used in

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Saint Medard en Jalles, France

Daniel Beziers