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Crystalline polyimidesAromatic crystalline polyimides are disclosed that are synthesized from polyamide-acid and when heated to 200 C to 300 C become cyclized to afford an opaque polymer. X-ray diffraction of the unoriented film exhibited 47 percent crystallinity. Differential scanning calorimetry reveals a melt at 425 C with no glass transition in these crystalline polyimides.
Document ID
19800007898
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
St.clair, T. L. (NASA Langley Research Center Hampton, VA, United States)
St.clair, A. K. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
December 25, 1979
Subject Category
Nonmetallic Materials
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-906299
Patent Number: US-PATENT-4,180,648
Patent Number: NASA-CASE-LAR-12099-1
Accession Number
80N16158
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,180,648|NASA-CASE-LAR-12099-1
Patent Application
US-PATENT-APPL-SN-906299

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