properties of m40j carbon/pmr-ii-50 composites fabricated with desized and … · 2013-04-10 ·...

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, Jgosau@adherent-tech.com)

** NASA Glenn Research Center, Cleveland, OH

Eugene. Shin@grc. nasa. gov, Linda. S.McCorkle@grc. nasa. gov,

James.K.Sutter@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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