Polyvinylidene fluoride composites and methods for preparing...

H - Electricity – 01 – B

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H01B 1/24 (2006.01) C04B 35/00 (2006.01) C08J 3/21 (2006.01) C08J 5/02 (2006.01) C08K 7/02 (2006.01) C08K 7/24 (2006.01)

Patent

CA 2453424

An electrically conductive composite comprising a polyvinylidene fluoride polymer or copolymer and carbon nanotubes is provided. Preferably, carbon nanotubes may be present in the range of about 0.5-20% by weight of the composite. The composites are prepared by dissolving the polymer in a first solvent to form a polymer solution and then adding the carbon nanotubes into the solution. The solution is mixed using an energy source such as a sonicator or a Waring blender. A precipitating component is added to precipitate out a composite comprising the polymer and the nanotubes. The composite is isolated by filtering the solution and drying the composite. The composites are also prepared by mixing or dispersing carbon nanotubes in polymer emulsion using an energy source such as a Waring blender. The liquid in the mixture is then evaporated to obtain the composite comprising the polymer and the nanotubes.

La présente invention concerne un composite électro-conducteur comprenant un polymère ou copolymère de poly(fluorure de vinylidène) et des nanotubes de carbone. De préférence, les nanotubes de carbone peuvent représenter de 0,5 % à 20 % de la masse du composite. Pour élaborer ces composites, on fait dissoudre le polymère dans un premier solvant de façon à obtenir une solution polymère à laquelle on ajoutera les nanotubes de carbone. Pour mélanger la solution, on utilise un sonicateur ou un "Blendor de Waring". En ajoutant un agent de précipitation, on obtient un précipité de polymère et de nanotubes. Pour isoler le composite, on filtre la solution et on sèche le filtrat. Pour élaborer ces composites, on peut également mélanger ou disperser les nanotubes de carbone dans une émulsion polymère au moyen d'une source mécanique telle qu'un "Blendor de Waring". On fait alors évaporer le liquide du mélange, ce qui laisse le composite comprenant le polymère et les nanotubes.

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