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Characterization of Surface Modified Carbon Fibers and Their Epoxy Composites by Small Angle X-Ray Scattering

Published online by Cambridge University Press:  26 February 2011

Bernhard Stoll ,
J. F. Fellers  and
J. S. Lin
Bernhard Stoll
Affiliation:
BAYER AG, Geschaftsbereich Kunststoffe, Anwendungstechnik, 5090 Leverkusen, Fed. Rep. of Germany
J. F. Fellers
Affiliation:
Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200
J. S. Lin
Affiliation:
National Center for Small Angle Scattering Research, Oak Ridge National Laboratory, Oak Ridge, TN 37830
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Abstract

This paper correlates the interlaminar shear strength of 7 different carbon fiber/epoxy composite with structural characteristics determined by Small Angle X-ray Scattering (SAXS) measurements. The carbon fibers were all of the same type but had different surface treatments. The SAXS patterns of the fibers and of the composites showed a highly nonlinear Guinier region which could not be approximated by traditional linear regression. A new approach to the Guinier approximation was developed to treat this nonlinear curve using a polynomial of second order. The radius of gyration (RG) of the fibers, as determined by this new method, correlated clearly with both the extent of the surface treatment and the interlaminar shear strength of the composite. Also the difference in scattering between a dry fiber and a glycerine soaked fiber provides a way to characterize the changes obtained by surface treatments. These methods provide new ways to estimate the efficiency of a surface treatment and its effect on the interlaminar shear strength by analyzing the SAXS patterns of the fibers.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 79: Symposium F – Scattering, Deformation and Fracture in Polymers , 1986 , 105
Copyright
Copyright © Materials Research Society 1987

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