Method of producing structures using centrifugal forces
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United States of America Patent
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Sep 7, 2004
Grant Date -
Feb 27, 2003
app pub date -
Jul 11, 2002
filing date -
May 12, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Hollow polymeric structures with unique morphologies are manufactured with a rotational spinning technique wherein phase separation of soluble solutions is induced within a filled mold as it is rotated. As phase-separation occurs, an increase in density of one phase results in sediment at a periphery under centrifugal forces and after or during sedimentation, gelation of phase-separated particles fixes a tube morphology. By controlling the rotational speed and the formulation chemistry, the tube dimensions and wall morphology can be manipulated. The method requires small quantities of starting material, permits multi-layering of tubes, is applicable to diverse polymers and results in highly diffusive hollow structures while maintaining good mechanical strength.
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