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Development of polyphenylquinoxaline graphite compositesThis exploratory program was divided into four basic tasks. The initial phase was devoted toward investigating processing variables associated with previously developed PPO resins. These polymers were derived from p-bis(phenyl glyoxalyl)benzene reacted with 3,3'-diamino benzidine and/or 3,3',4,4'-tetramino benzophenone. Four new phenyl quinoxaline polymers were synthesized and characterized in Tasks 2 and 3. These consisted of a hydroxyl group containing PPQ synthesized from 3,3'-diamino benzidine (DAB), m-bis(phenyl glyoxal)benzene and m-bis(p'-hydroxy phenyl glyoxalyl) benzene; a cyano group containing PPQ from the reaction of DAB and p-bis(p'-cyano phenoxy phenyl glyoxalyl)benzene; an end-capped block copolymer; and a polymer from the reaction of 3,3',4,4'-tetraamino benzo phenone and m-bis(phenyl glyoxalyl)benzene. The latter two polymers were chosen for composite studies in the latter two tasks of the program. Mechanical properties of the graphite reinforced PPQ composites were determined over the temperature range of +21 C to 316 C. Flexural strengths of the HMS graphite fiber composites were in excess of 8.97 X 10 to the 8th power N/sq m (130,000 psi) at +21 C (70 F) with over 50% strength retention at +316 C.
Document ID
19740023905
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hoggatt, J. T.
(Boeing Aerospace Co. Seattle, WA, United States)
Hill, S. G.
(Boeing Aerospace Co. Seattle, WA, United States)
Shdo, J. G.
(Boeing Aerospace Co. Seattle, WA, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Materials, Nonmetallic
Report/Patent Number
NASA-CR-134674
Report Number: NASA-CR-134674
Accession Number
74N32018
Funding Number(s)
CONTRACT_GRANT: NAS3-16799
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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