| Abstract
| - The mechanical properties and microstructures of three macrodefect-free (MDF) composites, prepared from Portland and high or medium alumina cements, were evaluated.Transmission electron microscopy shows that the interface between cement grains and thepolymeric matrix is porous in the case of alumina cements and pore free in the case ofPortland. The analyses of the ions present in the polymeric matrix were performed by energydispersive X-ray spectrometry, and surface free energy of the materials was estimatedthrough dynamic contact angle measurements by using a Wilhelmy microbalance. The resultssuggest that Fe3+ and Al3+ ions interact differently with the polymeric matrix. This fact isalso supported by dynamic mechanical thermal tests. When Portland cement is used, themicrostructure of the MDF composite does not show any interphase region.
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