Abstract
The influence of ultrasonic treatment, applied during the impregnation of carbon fiber bundle byepoxy resin system, on thermal behavior of carbon fiber/epoxy resin composites in the course of crosslinknetworkformation has been analyzed by differential scanning calorimetry (DSC). It was previouslyshown [1] that this treatment has resulted in drastically increased interlaminar shear strength (ILSS) ofthe bulk composites, produced by hot pressing. The enhanced ILSS was attributed to the formation ofmore homogeneous and dense network, as revealed by epoxy consumption rate and increased Tg. In thispaper, DSC analysis is applied to further investigate peculiarities of carbon fiber/epoxy systems, exposed toultrasonic treatment, during isothermal and non-isothermal curing and post-curing. The acceleration of thecuring reaction as a consequence of sonication effects was found for all fiber/polymer systems, regardlessthe surface chemistry of the fibers. The stronger interfacial bond in epoxy sized carbon fiber composites,favored by ultrasound treatment, has also generated differences in thermal behavior of the compositesduring their degradation followed by TGA/DTG.
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