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Interfacial Bonding Mechanisms in Carbon Fiber/Pmr-15 Composites

Published online by Cambridge University Press:  15 February 2011

A. M Serrano ,
I. Jangchud ,
R. K. Eby ,
K. J. Bowles  and
D. T. Jayne
A. M Serrano
Affiliation:
The University of Akron, Institute of Polymer Science, Akron, OH 44325.
I. Jangchud
Affiliation:
The University of Akron, Institute of Polymer Science, Akron, OH 44325.
R. K. Eby
Affiliation:
The University of Akron, Institute of Polymer Science, Akron, OH 44325.
K. J. Bowles
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135.
D. T. Jayne
Affiliation:
Case Western Reserve University, Department of Mechanical and Aerospace Engineering, Cleveland, OH 44106.
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Abstract

X-ray photoelectron spectroscopy (XPS), tensiometric wetting, and atomic force microscopy (AFM) were used to investigate the surfaces of PAN based carbon fibers. Percent weighted dipole moments (%WDM) were computed from the deconvoluted core level carbon XPS peaks. Tensiometric wetting separated the polar and dispersive components of the fiber surface energies thus allowing the computation of % polar energies. AFM provided quantitative measurements of the fiber surface rugosities. Scanning electron microscopy (SEM) revealed adhesive interfacial fractures for PMR-15 (polyimide) composites of fibers with low %WDM and % polar energies; cohesive fractures for those with high %WDM and % polar energies. Increasing interlaminar shear strengths correlated with increasing %WDM and % polar energies. The fibers with higher %WDM also had rougher surfaces which probably expose more graphite basal plane dipole sites in addition to providing mechanical interlocking.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 305: Symposium I – High-Performance Polymers and Polymer Matrix Composites , 1993 , 105
Copyright
Copyright © Materials Research Society 1993

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