Office National D'etudes Et De Recherches Aerospatiales

Societe Nationale Des Poudres Et Explosifs

Office National D'etudes Et De Recherche Aerospatiales (onera)

Office National D'etudes Et De Recherches

Bertrand Bloch

Andre-Jean Attias

Marcel Ropars

Chantal Cavalli

Denis Charrier

Michel Parlier

Patrick Noireaux

Claude Andrieux

Jean Jamet

Erick Bouillon

Claude Muller

Andre Attias

Jacques Ancelle

Pierre Audebert

Chantal Cavalli Born Meyer

Chantal C Meyer

The invention relates to conjugated compounds of general formula (I) ##STR1## wherein X.sub.1 and X.sub.2 are, independently of one another, electron-withdrawing or electron-donating systems, and to a process for the preparation of these compounds. The invention also relates to any material which includes the compounds of general formula I and to the use of said compounds or of any material which includes them in electronic, optoelectronic, nonlinear optical and electrooptical devices.

Polymers from certain conjugated organic compounds

Conjugated organic compounds and preparation process

Silane-type coupling agent, process for its preparation, and its use for

The matrix is formed by particles of ceramic material which are introduced into the empty spaces of a fibrous structure and are bonded to one another by bridges of ceramic material obtained by in situ pyrolysis of a liquid polymer. By means of this process, a composite material of low porosity, despite a high reduction in volume during pyrolysis, is obtained relatively rapidly.

Process for the production of a ceramic fiber/matrix composite material

The object of the present invention are new thermoset resins having quickened curing, a process for their preparation, and their applications. The resins according to the invention consist, at least in part, of the products resulting from the polycondensation of one or more pyridine derivatives containing at least two methyl groups in the 2, 4 or 6 positions, with one or more aromatic dialdehydes, and the addition of one or more additives consisting of phenol compounds. These resins are used to the fabrication of composite materials.

Thermoset polymers and prepolymers with rapid curing, obtained by

The object of the invention are new thermoset polymers and prepolymers, a process for their preparation, and their uses. The new thermoset prepolymers consist, at least in part, of the polycondensation products of one or more pyridine derivatives containing at least two activated methyl groups with one or more aromatic monoaldehydes containing at least one hydroxyl group. These prepolymers are used to prepare composite materials, in particular laminates, that can be used at high temperatures.

Thermoset polymers and prepolymers obtained by polycondensation of alkyl

The invention relates to a novel process for making phenyl fluoroacrylate monomer. The monomer is obtained by reaction of a fluoroacrylic salt with an halogenating agent, followed by condensation of the fluoroacryloyl halogenide with phenol and recovery of the phenyl fluoroacrylate. The obtained monomer is applicable to the manufacture of transparent polymers of high thermal stability.

Process for making an acrylic monomer

The invention relates to poly(phenyl fluoracrylate) a novel polymer. The polymer is useful for the manufacture of transparent materials with very high heat stability.

Novel acrylic polymers and method of making same

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Paris, France

Bertrand Bloch