Iron-carbon nanofillers for polymer composites were obtained by catalytic decomposition of ethylene on nanocrystalline iron. The carburisation was performed under ethylene/hydrogen mixture or under pure ethylene. Three kinds of samples were prepared: cementite/carbon, iron/cementite and iron/carbon. After carburisation the samples were characterised using XRD and SEM method. The obtained nanofillers were applied for polymer nanocomposites prepared by polycondensation reaction (in situ) in poly(ether-ester) matrix. The nanofillers were dispersed in monomers (diols) using sonificator and a high - speed rotary mixer. The obtained nanocomposites were characterized using SEM method. The addition of iron-carbon nanofillers increases the stress-strength of composite (ca. 30% at break) and the elongation at break.

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