Method of producing structures using centrifugal forces

Details Method of producing structures using centrifugal forces Method of producing structures using centrifugal forces

B - Operations, Transporting

29

C

B29C 41/04 (2006.01) A61B 17/11 (2006.01) A61K 9/00 (2006.01) A61L 27/00 (2006.01) A61L 31/00 (2006.01) B29C 41/50 (2006.01)

Patent

CA 2515919

A variety of hollow structures with unique morphologies were manufactured with a rotational spinning technique. Phase separation of soluble solutions or emulsions was induced within a filled mold as it was being rotated about one of its axis. The density difference between phases results in sediment at the inner lumen of the mold under centrifugal forces. After or during sedimentation, gelation of the phase-separated particles fixes the hollow structure morphology and the solvent remains in the center of the mold. The solvent is removed from the mold resulting in a coating or tube. By controlling the rotational speed and the formulation chemistry, the tube dimensions and wall morphology can be manipulated. This technique offers a new approach to the manufacture of polymeric tubes. It requires small quantities of starting material, permits multi-layering of tubes, is applicable to diverse polymers and can result in highly diffusive hollow structures while maintaining good mechanical strength.

La présente invention se rapporte à la fabrication de diverses structures creuses présentant des formes uniques par mise en oeuvre d'une technique de filature par rotation. La séparation des phases de solutions ou émulsions solubles est effectuée à l'intérieur d'un moule rempli qui est en rotation autour d'un de ses axes. La différence de densité entre les phases entraîne la formation d'un sédiment au niveau de la lumière interne du moule sous l'effet des forces centrifuges. Pendant ou après la sédimentation, la gélification des particules, séparées par phase, fixe la forme de la structure creuse et le solvant reste au centre du moule. Le solvant est retiré du moule ce qui aboutit à la formation d'un revêtement ou tube. La régulation de la vitesse de rotation et de la composition chimique de la formulation permet de gérer les dimensions du tube et la forme de la paroi. Cette technique constitue une nouvelle approche pour la fabrication de tubes polymères. Elle nécessite de faibles quantités de matière première, permet la formation de tubes multicouches, s'applique à divers polymères et permet la formation de structures creuses hautement diffusives qui présentent cependant une bonne résistance mécanique.

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