Thomson-csf

Philippe Michel

Olivier Sagnes

Alexandre Moradpour

Paul Penven

Denis Jerome

Marie Vergnolle

Disclosed is a method to obtain a film of composite material based on particles of conductive polymer, stabilized by a highly steric or highly ionic surfactant. The efficient stabilization of the particles makes it possible to control the progress of the dielectrical properties of the materials as a function of the conductive entity content, leading to the preparation of films with variable impedance. The method can be applied to the making of coatings that meet goals related to electromagnetic wide-band attenuation. FIG. 2 .

Method for obtaining composite conductive materials based on conductive

Disclosed is a novel method for obtaining conductive polymers enabling their conductive to be increased and thermally stabilized. The polymers are obtained by oxidative chemical process in the presence of a codopant, the anions of which are more stable than the oxidating anions. The synthesis of the polymer is furthermore followed by a thermal treatment operation by which the conductivity of the material obtained is stabilized. Application: microwave absorbents.

Method for the obtaining of polymers with thermally stable conductivity

Disclosed is an organic material with a very narrow electronic spin resonance (ESR) line. This material is formed by a 1, 2, 7, 8-tetrahydrocyclopentataperylene salt which may have, advantageously, undergone a heat treatment. The material can be applied to the fabrication of probes for gaussmeters and magnetometers.

Organic material with extremely narrow electron spin resonance line and

The invention relates to a process for preparing a polyalkyl perylene which consists in subjecting the corresponding polyalkyl 1,1'-dinaphthalene derivative to a cyclodehydrogenation reaction, by means of an alkali metal. It also relates to the polyalkyl perylene obtained, and to the organic material derived therefrom exhibiting an electron spin resonance spectrum.

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Paris, France

Philippe Michel