Mehmet Galip İÇDUYGU, Ahmet GÜLTEK, Nurten EKİN

Investigation of long-term water absorption behavior of carbon fabric reinforcedepoxy composites containing hydrophobic nanosilica

The effect of water absorption on the chemical and mechanical properties of hydrophobic ller containingepoxy matrix composites was investigated by keeping them in distilled water for 9 months. Aerosil R812 (8 nm) andAerosil R972 (12 nm) were utilized at 3% and 5% w/w ller to resin ratio and the resin/ ller mixture was combined with12-ply carbon fabric to get 15 15 cm samples. Samples were molded under a hot press and for each sample 50 testsamples obtained by cutting them with a water jet. The obtained samples were characterized by TG, FTIR, and SEM.The effect of water absorption was evaluated by measuring percentage water absorption and exural strength of samplesover 9 months. The results revealed that ller addition lowers the damage created by distilled water a considerableamount and addition of hydrophobic llers to epoxy matrix composites can be especially bene cial for applicationswhere long-term water exposure is desired.

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