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Nanocharacterization of Surface and Interface of Different Epoxy Networks.

pdf icon Nanocharacterization of Surface and Interface of Different Epoxy Networks. (167 K)
Gu, X.; Ho, D. L.; Sung, L. P.; VanLandingham, M. R.; Nguyen, T.; Raghavan, D.

DD Polymer Interfaces and Thin Films. Materials Research Society (MRS) Symposium. Proceedings. Volume 710. 2002, Karim, A.; Frank, C. W.; Russel, T. P.; Nealey, P. F., Editor(s)(s), DD109.1-DD109.6 pp, 2002.


epoxy networks; crosslinking density; amine-cured epoxy; atomic force microscopy; small angle neutron scattering; surface and interface


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.