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Reactions of Defined Oxidized Carbon Fiber Surfaces with Model Compounds and Polyurethane Elastomers

Published online by Cambridge University Press:  15 February 2011

Charles U. Pittman Jr. ,
Steven D. Gardner ,
Guoren He ,
Lichang Wang ,
Zhihong Wu ,
C. Singamsetty ,
Biahua Wu  and
Glyn Booth
Charles U. Pittman Jr.
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Steven D. Gardner
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Guoren He
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Lichang Wang
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Zhihong Wu
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
C. Singamsetty
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Biahua Wu
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
Glyn Booth
Affiliation:
Departments of Chemistry and Chemical Engineering, Mississippi State University, Mississippi State, MS 39762
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Abstract

Ex-PAN carbon fiber surfaces, oxidized to varying degrees by HNO3, have been characterized by NaOH, dye and HCl uptake, ion scattering spectroscopy (ISS), and angleresolved X-ray photoelectron spectroscopy (ARXPS). Subsequent treatments with tetraethylenepentamine to introduce amino groups or epichlorohydrin to introduce epoxy groups have been thoroughly characterized. The efficiency of using these surface functions to bond polymers onto fiber surfaces has been investigated using model anhydrides and isocyanates (for amines) and diols and diamines (for epoxides). The fraction of surface-bound groups which react drops with an increase in molecular size of the species being grafted. Crosslinked elastomeric polyurethane layers with designed modulus values and thicknesses have been bonded to these fibers. Composites have been prepared (epoxy matrices). The impact strengths and interlaminar shear strengths (ILSS) were studied as a function of the interphase modulus and thickness. Impact strengths increased (even at 500–1500 Å thicknesses). ILSS values depend on interphase modulus.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 385: Symposium N – Polymer/Inorganic Interfaces II , 1995 , 195
Copyright
Copyright © Materials Research Society 1995

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References

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