properties of m40j carbon/pmr-ii-50 composites fabricated with desized and … · 2013-04-10 ·...
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PROPERTIES OF M40J CARBON/PMR-II-50COMPOSITES FABRICATED WITH DESIZED AND
SURFACE TREATED FIBERS
Ronald E. AIIred*, Jan M. Gosau*,
E. Eugene Shin**, Linda S. McCorkle**, and James K. Sutter**,Michelle O'Malley***Abstract
To increase performance and durability of high temperature composites for
potential rocket engine components, it is necessary to optimize wetting and
interfacial bonding between high modulus carbon fibers and high
temperature polyimide resins. It has been previously demonstrated that the
electro-oxidative shear treatments used by fiber manufacturers are not
effective on higher modulus fibers that have fewer edge and defect sites in
the surface crystallites. In addition, sizings commercially supplied on most
carbon fibers are not compatible with polyimides. This study was an
extension of prior work characterizing the surface chemistry and energy of
high modulus carbon fibers (M40J and M60J, Torray) with typical fluorinated
polyimide resins, such as PMR-II-50. A continuous desizing system which
utilizes environmentally friendly chemical-mechanical processes was
developed for tow level fiber and the processes were optimized based on
weight loss behavior, surface elemental composition (XPS) and morphology
(FE-SEM) analyses, and residual tow strength of the fiber, and the similar
approaches have been applied on carbon fabrics. Both desized and further
treated with a reactive finish were investigated for the composite
reinforcement. The effects of desizing and]or subsequent surface re-
treatment on carbon fiber on composite properties and performance including
fiber-matrix interfacial mechanical properties, thermal properties and
blistering onset behavior will be discussed in this presentation.
* Adherent Technologies, Inc., Albuquerque, NM (Rallred@adherent-
tech.com, [email protected])
** NASA Glenn Research Center, Cleveland, OH
Eugene. Shin@grc. nasa. gov, Linda. S.McCorkle@grc. nasa. gov,
*** Summer Intern at NASA Glenn Research Center, Chemical/Biomedical
and Health Engineering, Carnegie Mellon University
This is a preprint or reprint of a paper intended for presentation at aconference, Because changes may be made before formalpublication, this is made available with the understanding that it willnot be cited or reproduced without the permission of the author.
https://ntrs.nasa.gov/search.jsp?R=20020072718 2020-03-19T13:13:52+00:00Z
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