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Nanocharacterization of Surface and Interface of Different Epoxy Networks

Published online by Cambridge University Press:  17 March 2011

X. Gu,
D. Raghavan,
D.L. Ho,
L. Sung,
M.R. VanLandingham and
T. Nguyen
X. Gu
Affiliation:
Chemistry Department, Howard University, Washington D.C. 20059
D. Raghavan
Affiliation:
Chemistry Department, Howard University, Washington D.C. 20059
D.L. Ho
Affiliation:
National Institute of Standards and Technology Center for Neutron Research, 100 Bureau Drive, stop 8562, Gaithersburg, MD 20899
L. Sung
Affiliation:
Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, stop 8621, Gaithersburg, MD 20899
M.R. VanLandingham
Affiliation:
Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, stop 8621, Gaithersburg, MD 20899
T. Nguyen
Affiliation:
Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, stop 8621, Gaithersburg, MD 20899
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Abstract

The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with different ratios of 1,3-bis(aminomethyl)cyclohexane (terafunctional amine) and cyclohexylmethylamine (difunctional amine). All samples are cured in CO2-free air. Both the film surface in contact with air and that in contact with the silicon substrate (the interface) are analyzed using atomic force microscopy (AFM) and nanoindentation. Small angle neutron scattering (SANS), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, and contact angle measurements, are used to assist in the interpretation of AFM results. Substantial morphological and mechanical differences are observed between the surface and the interface for different crosslinked epoxies. The findings have strong implications on the wettablity, adhesion, and durability of amine-cured epoxies.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 710: Symposia DD – Polymer Interfaces and Thin Films , 2001, DD10.9.1
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

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