Centre National De La Recherche Scientifique

Astrium Sas

Arianegroup Sas

Université De Reims Champagne-ardenne

Université Des Sciences Et Technologies De Lille

Airbus Defence and Space Sas

Airbus Safran Launchers Sas

Eads Space Transportation Sa

Institut National Des Sciences Appliquees

Universite De Reims

Insavalor

Brigitte Defoort

Xavier Coqueret

Dominique Lacour

Bastien Rivieres

Robin Pouyet

Henri Cramail

Stéphane Grelier

Emile Perez

Jean-François Gerard

Etienne Grau

Alain Soum

Estelle Chauray

Frédéric Boursereau

Philippe Ponsaud

Mickael Krzeminski

Etienne Savonnet

Audrey Menochet

Vincent Peypoudat

Cyril Gautrias

Vincent Roucoules

Xavier Cocqueret

Alexis Villemain

Frédéric Vautard

Jacques Schultz

Michel Nardin

Cécile Lesamber

Arnaud Martin

Mickaël Krzeminski

Maeliss Frisari

Amandine Flourez

Antoine Humblot

Hélène Lebrun

Olivier Le-Couls

Roman Mahias

Julien L'INTERMY

Nicolas Grignon

Marc Lavaud

Marie Musset

Davy Guihard

Cyrille Vincent

Frederic Vautard

Julien L'intermy

Jean-Francois Gerard

Marion Mille

Jannick Duchet-rumeau

Aurélie Malho Rodrigues

Sophie Franceschi

A process for manufacturing chromenes intended for the preparation of thermosetting resins, includes transforming an aromatic propargyl ether of general formula (I) into a chromene by homogeneous gold(I) catalysis with the catalyst (acetonitrile)[(2-biphenyl)di-tert-butylphosphine]gold(I) hexafluoroantimonate in an organic solvent under an inert or non-inert atmosphere. Moreover, a process for preparing a material made of thermoset resin, includes successively a) implementation of the above process; polymerization of the reaction product obtained in step a) so as to obtain the material made of thermoset resin; c) recovery of the material made of thermoset resin obtained in step b).

Gold-catalysed process for manufacturing chromenes intended for the preparation of thermosetting resins

A process for producing chromenes intended for the preparation of thermosetting resins, includes converting an aromatic propargyl ether of general formula (I) into a chromene by homogeneous catalysis with copper salts in anisole at a temperature between 100 and 170&#xb0; C. Moreover, a process for preparing a material made of thermoset resin, includes successively a) carrying out the above process; b) polymerizing the reaction product obtained in a) so as to obtain the material made of thermoset resin; c) recovering the material made of thermoset resin obtained in b).

Process for producing chromenes by catalysis with copper salts intended for the preparation of thermosetting resins

A process for manufacturing chromenes which are intended for the preparation of thermosetting resins, includes transforming an aromatic propargyl ether of general formula (I) into a chromene by flash vacuum thermolysis, at a temperature of between 300 and 600&#xb0; C., at a pressure of between 4 and 10,000 Pa. It also concerns a process for preparing a material made of thermoset resin, including successively: a) implementation of the above process; b) polymerization of the reaction product obtained in a) so as to obtain the material made of thermoset resin; c) recovery of the material made of thermoset resin obtained in b).

Thermolysis-mediated process for manufacturing chromenes intended for the preparation of thermosetting resins

A multi-epoxidized biphenyl compound has the formula (I) below wherein R, R, Rand Rare as defined in the description, as well as mixtures of at least two of the compounds. These multi-epoxidized biphenyl compounds are fully suitable as main constituents of thermosetting epoxy resins, i.e. as polyepoxides precursors. They are beneficial substitutes for bisphenol A diglycidyl ether.

Polyepoxidized biphenyl compounds, preparation and uses

A difunctional biphenyl compounds corresponding to formula (I) wherein Alk, Alk' and R are as defined in the description. These compounds are suitable as hardeners for thermosetting resins, especially epoxy resins.

Difunctional biphenyl compounds, preparation, and uses

The invention relates to a curable resin that represents an excellent substitute for phenolic resins and is therefore able to replace phenolic resins in all applications in which they are used. Said resin is characterised in that it comprises: (1) at least one prepolymer resulting from the prepolymerisation of a compound A comprising at least one aromatic or heteroaromatic ring, a first group &#x2014;O&#x2014;CH2-C&#x2261;CH and at least one second group selected from the groups &#x2014;O&#x2014;CH2-C&#x2261;CH2 and &#x2014;CH2-CH&#x2550;CH2, said groups being carried by the at least one aromatic or heteroaromatic ring; and (2) a compound B comprising at least two thiol groups (&#x2014;SH). The invention also relates to a material obtained by curing said curable resin, and in particular to an ablative composite material. The invention further relates to a material obtained by curing said curable resin.

Curable resin as a substitute for phenolic resins and the applications thereof

A sizing composition for reinforcing fibres is provided which makes it possible to improve the adhesion of these fibres with respect to an organic matrix that forms, with them, a part made of a composite material and that results from the chain transfer polymerization of a curable resin. The sizing composition includes a polybutadiene prepolymer comprising at least two epoxide functions, a cross-linking agent comprising at least two reactive functions, at least one of which is a thiol function; and a catalyst comprising at least one tertiary amine function. The sizing composition may be used in the following fields of use: aeronautical, aerospace, railway, naval and motor vehicle industries, for example, for the production of structural, engine, passenger compartment or body work parts; arms industry, for example, for the production of parts incorporated into the composition of missiles or missile launch tubes; sports and leisure goods industry, for example, for the production of goods intended for water sports and board sports.

Sizing composition for reinforcing fibres and applications thereof

The invention relates to an aqueous impregnation bath for reinforcement fibers for manufacturing prepregs having a thermoplastic matrix, resulting in highly satisfactory consolidation, in terms of residual porosity, of the composite material parts manufactured using the prepregs. The impregnation bath includes a least one thermoplastic polymer, a surfactant and water, and is characterized in that the surfactant is an ethoxylated stearyl alcohol of formula: HO&#x2014;(CH&#x2014;CH&#x2014;O)&#x2014;CH&#x2014;(CH)&#x2014;CHwherein n is 100. The invention also relates to a method for impregnating reinforcement fibers using the impregnation bath, to a method for manufacturing a prepreg having a thermoplastic matrix using the impregnation method, and to a method for manufacturing a part made of a composite material having a thermoplastic matrix using the method for manufacturing a prepreg. The invention is useful in any field for manufacturing parts made of composite materials and, specifically, in the aeronautical, space, rail, shipping and automotive industries.

Aqueous impregnation bath for reinforcement fibres and uses thereof

The invention concerns a method for producing, by welding, a link between an element made from any material, for example metal, and an element made from a thermoplastic-matrix composite material, the second element being produced by depositing a textile yarn pre-impregnated with a thermoplastic material on the surface of the first element. The method mainly includes an operation consisting of producing an interface coating consisting of an epoxy resin filled with a thermoplastic material powder, coating the surface of the element made from any material with same, and leaving the coating to polymerize. It next includes an operation consisting simultaneously of forming the second element and welding same to the coating deposited on the surface of the first element by locally heating the two elements, when depositing the pre-impregnated textile on the first element.

Link between a thin metal liner and a composite wall by thermoplastic particle-filled coating

The invention relates to a method of assembling pre-impregnated plies by local isolated polymerization of the assembly region () under the action of a radiation to which the resin of the prepreg is sensitive. The assembly method makes it possible in particular to produce very large sized gossamer structures () in the form of a concertina-folded tube which is deployed by injecting pressurized gas once in space then stiffened by polymerization under the effect of the same radiation. The pylon concerned () thus comprises two structural elements () secured end to end while at the same time maintaining its flexibility and firmness qualities.

Assembly of prepregs for producing structures, for example ones which deploy through inflation

A curable composition, and a material obtained by curing the composition, in which the curable composition includes a vinylester polymerisable compound, jointly with a sulphonated polyaromatic thermoplastic polymer, and an N-vinyl lactam, and which is characterised in that it further includes, a first non-vinylester polymerisable compound which includes at least one isocyanurate group bearing at least two (meth)acrylate groups; and a second non-vinylester polymerisable compound which includes at least one carbopolycyclic or heteropolycyclic group bearing at least two (meth)acrylate groups.

Curable compositions allowing to obtain materials having an optimised performance, and materials obtained from said compositions

A method increases the toughness of a material obtained by curing a composition that includes at least one vinyl ester monomer. The method includes the incorporation into the composition of a sulfonated polyaromatic thermoplastic polymer, which is achieved by dissolving the vinyl ester monomer and the thermoplastic polymer in a reactive diluent in which they are both soluble. The resulting curable composition includes at least one vinyl ester monomer, and very high toughness materials can be made from it. A curable composition can include at least one vinyl ester monomer, a sulfonated polyaromatic thermoplastic polymer and a N-vinyl lactam. The compositions can be used in the aeronautical, space, railway, nautical, automotive industries, arms and other industries.

Increase in the toughness of a material obtained from a curable composition comprising at least one vinyl ester monomer

The invention relates to a process for improving the adhesion of carbon fibers by coating a surface of the carbon fibers with a polymer film containing functional groups capable of acting as chain transfer agents during a chain transfer polymerization of a resin curable by chain transfer polymerization to obtain coated carbon fibers. The coated carbon fibers are then contacted with the curable resin, and the chain transfer polymerization of the curable resin is induced to produce an organic matrix and forming a composite material. The functional groups of the polymer film act as chain transfer agents during the chain transfer polymerization of the curable resin and thereby improve adhesion of the carbon fibers to the organic matrix. Applications of this invention include aeronautical, aerospatial, shipbuilding, railway and motor vehicle industries, armaments industry, sports and leisure articles, and the like.

Process for improving the adhesion of carbon fibres with regard to an organic matrix

The invention relates to a process for improving the adhesion of carbon fibres with regard to an organic matrix forming a composite material with these fibres, this composite material being obtained by bringing the fibres into contact with a resin which can be cured by chain polymerization and then polymerizing the resin, which process is characterized in that it comprises the grafting, to the surface of the fibres, before they are brought into contact with the resin, of groups capable of acting as chain transfer agents during the polymerization of said resin. Fields of application: aeronautical, aerospatial, railway, ship building and automobile industries but also the armaments industry, the industry of sports and leisure articles, and the like.

Method for enhancing adherence of carbon fibers with respect to an organic matrix

The invention relates to a process that makes it possible to improve the mechanical strength of bonds between substrates when these bonds are produced by means of an adhesive that comprises a resin that can be cured by chain polymerization, and in particular a resin that can be cured under the effect of ionizing or light radiation. This process is characterized in that it comprises the grafting of groups capable of acting as chain transfer agents during the polymerization of said resin to the surface of the substrates, before the latter are brought into contact with the adhesive. Applications: assembling of structural, engine, passenger compartment or bodywork parts in the aeronautical, space, railway, ship-building and automotive industries.

Method for improving mechanical strength of bondings made with an adhesive based on curable resin by chain polymerization

Growing community of inventors

Saint Medard en Jalles, France

Brigitte Defoort