Gradient materials developed on the basis of poorly compatible epoxy oligomers are proposed. The influence of the composition and curing conditions on the stratification of the compounds was studied: The distribution of the components of the curing systems was determined by Fourier transform infrared and elemental analysis. The microhardness and glass-transition temperature varied across the section as a function of the component content and curing temperature. (c) 2006 Wiley Periodicals, Inc.