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Hollow Polyimide MicrospheresA shaped article composed of an aromatic polyimide has a hollow, essentially spherical structure and a particle size of about 100 to about 1500 micrometers, a density of about 1 to about 6 pounds/cubic foot 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 bonded together by a matrix resin to form an integral composite structure, has a density of about 3 to about 30 pounds/cubic feet and a compression strength of about 100 to about 1400 pounds/sq inch.
Document ID
20010054710
Acquisition Source
Langley Research Center
Document Type
Other - Patent
Authors
Weiser, Erik S.
(NASA Langley Research Center Hampton, VA United States)
St.Clair, Terry L.
(NASA Langley Research Center Hampton, VA United States)
Echigo, Yoshiaki
(NASA Langley Research Center Hampton, VA United States)
Kaneshiro, Hisayasu
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
May 22, 2001
Subject Category
Nonmetallic Materials
Report/Patent Number
Patent Application Number: US-Patent-Appl-SN-316865
Patent Number: US-Patent-6,235,803
Patent Number: NASA-Case-LAR-15831-1
Patent Application Number: US-Patent-Appl-SN-408652
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-6,235,803|NASA-Case-LAR-15831-1
Patent Application
US-Patent-Appl-SN-316865|US-Patent-Appl-SN-408652
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