NASA NTRS · 20000030737
Hollow Polyimide Microspheres
Abstract
A shaped article composed of an aromatic polyimide has a hollow, essentially spherical structure and a particle size of about 100 to about 1500 microns, a density of about I to about 6 pounds/ft3 and a volume change of 1 to about 20% by a pressure treatment of 30 psi for 10 minutes at room temperature. A syntactic foam, made of a multiplicity of the shaped articles which are bounded together by a matrix resin to form an integral composite structure, has a density of about 3 to about 30 pounds/cu ft and a compression strength of about 100 to about 1400 pounds/sq in.
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Weiser, Erik S., St.Clair, Terry L., Echigo, Yoshiaki, Kaneshiro, Hisayasu. 1999-11-30. Hollow Polyimide Microspheres. https://ntrs.nasa.gov/citations/20000030737
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