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Aromatic polyimides containing a dimethylsilane-linked dianhydrideA high-temperature stable, optically transparent, low dielectric aromatic polyimide is prepared by chemically combining equimolar quantities of an aromatic dianhydride reactant and an aromatic diamine reactant, which are selected so that one reactant contains at least one Si(CH3)2 group in its molecular structure, and the other reactant contains at least one -CF3 group in its molecular structure. The reactants are chemically combined in a solvent medium to form a solution of a high molecular weight polyamic acid, which is then converted to the corresponding polyimide.
Document ID
19900017640
Acquisition Source
Legacy CDMS
Document Type
Other - Patent Application
Authors
St.clair, Anne K. (NASA Langley Research Center Hampton, VA., United States)
St.clair, Terry L. (NASA Langley Research Center Hampton, VA., United States)
Pratt, J. Richard (PRC Kentron, Inc., Hampton VA., United States)
Date Acquired
August 14, 2013
Publication Date
December 12, 1989
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.71:LAR-14198-1
Accession Number
90N26956
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-LAR-14198-1
Patent Application
US-PATENT-APPL-SN-449210

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