Commissariat a L'energie Atomique

L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

Laurent Delnaud

Philippe Mazabraud

Katia Barral

Elodie Chauvot

Pierrick Buvat

Franck Jousse

Christian Levassort

The present invention relates to a composition that can be used to manufacture an impermeable, sealing, tight envelope, to a process for manufacturing an impermeable envelope, and to a tank. The composition of the invention comprises in % by weight relative to the total weight of the composition: from 70 to 90% of a monomer (I); from 0.1 to 1% of an activator (II), in which R is chosen from the group comprising CH, n being an integer chosen from 1 to 10; &#x2014;OH; &#x2014;OCH, n being an integer chosen from 1 to 10; and &#x2014;NHR' where R&#x2032; is either CH, n being an integer chosen from 1 to 10, or an amine functional group; from 2 to 6% of a catalyst (III), in which X is chosen from the group comprising MgBr, MgI, Li and Na; and from 10 to 20% of an additive (IV), with: This composition can be used, for example, to manufacture elements that are impermeable to fluids, for example impermeable envelopes, for example that can be used in the manufacture of type IV tanks or hydraulic accumulators.

Caprolactam-based composition, process for manufacturing an impermeable element, and 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.

Poly (ethynylene phenylene ethynylene polysiloxene(silylene)) and methods for preparing same

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Ballan-Mire, France

Laurent Delnaud