Materials having high electrical conductivity at room...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 3/28 (2006.01) C08F 2/46 (2006.01) H01B 1/00 (2006.01) H01B 1/04 (2006.01) H01B 1/12 (2006.01)

Patent

CA 2244822

A method is disclosed for producing a polymer material whose room temperature conductivity exceeds 10 6 S/cm. In a preferred embodiment the material is produced in the form of a film having thickness less than 100 µm. Conduction takes place through threads passing through the film which is otherwise a dielectric. The film is produced by first depositing a macromolecular polymer substance on a substrate. During preparation, the substance must be in a viscose liquid state. Stable free electrons (polarons) are then created by ionizing the substance. This is assisted by exposure to UV radiation and the presence of strong polar groups in the polymer. Various techniques, such as applying a strong electric field, are then used to join the polarons together into conducting threads within the medium. To stabilize the conductivity, the medium is then solidified by cooling it below its glassing point or inducing cross-linking between the macromolecules.

On décrit un procédé de production d'un matériau polymère dont la conductivité à température ambiante excède 10<6> s/cm. Dans un mode de réalisation préféré, on produit le matériau sous la forme d'un film possédant une épaisseur inférieure à 100 mu m. La conduction s'effectue grâce à des fils passant à travers le film, lequel constitue alors un diélectrique. On produit ce film en déposant d'abord une substance polymère macromoléculaire sur un substrat, cette substance devant être, lors de sa préparation, à l'état liquide de viscose. Ensuite, on crée des électrons libres stables (polarons) par ionisation de la substance, laquelle est rendue possible par une exposition de la substance à un rayonnement ultraviolet et par la présence de groupes polaires forts dans le polymère. On utilise ensuite plusieurs techniques, telles qu'une application d'un fort champ électrique, afin de joindre ensemble les polarons dans les fils conducteurs placés dans le film. Pour stabiliser la conductivité, on solidifie le film en le refroidissant à une température inférieure à son point de vitrification ou en provoquant une réticulation entre les macromolécules.

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