NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Polyimide Composites from 'Salt-Like' Solution PrecursorsFour NASA Langley-developed polyimide matrix resins, LaRC(TM)-IA, LaRC(TM)-IAX, LaRC(TM)-8515 and LaRC(TM)-PETI-5, were produced via a 'saltlike' process developed by Unitika Ltd. The salt-like solutions (65% solids in NMP) were prepregged onto Hexcel IM7 carbon fiber using the NASA LaRC multipurpose tape machine. Process parameters were determined and composite panels fabricated. The temperature dependent volatile depletion rates, the thermal crystallization behavior and the resin rheology were characterized. Composite molding cycles were developed which consistently yielded well consolidated, void-free laminated parts. Composite mechanical properties such as the short beam shear strength; the longitudinal and transverse flexural strength and flexural modulus; the longitudinal compression strength and modulus; and the open hole compression strength and compression after impact strength were measured at room temperature and elevated temperatures. The processing characteristics and the composite mechanical properties of the four intermediate modulus carbon fiber/polyimide matrix composites were compared to existing data on the same polyimide resin systems and IM7 carbon fiber manufactured via poly(amide acid) solutions (30-35% solids in NMP). This work studies the effects of varying the synthetic route on the processing and mechanical properties of the polyimide composites.
Document ID
20020039061
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
Cano, Roberto J.
(NASA Langley Research Center Hampton, VA United States)
Hou, Tan H.
(NASA Langley Research Center Hampton, VA United States)
Weiser, Erik S.
(NASA Langley Research Center Hampton, VA United States)
SaintClair, Terry L.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Publication Information
Publication: High Performance Polymers
Publisher: Institute of Physics Publishing
Volume: 13
ISSN: 0954-0083
Subject Category
Nonmetallic Materials
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available