Moisture absorption of carbon/epoxy nanocomposites

Date

2020-03-01

Author

Güloğlu, Görkem Eğemen
Altan, M. Cengiz

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© 2020 by the authors. Licensee MDPI, Basel, Switzerland.Moisture absorption of composites with nanoscale carbon additives such as carbon nanotubes, carbon nanofibers, graphite nanoplatelets, and carbon black is investigated using thermogravimetric data and a non-Fickian hindered diffusion (Langmuir-type) model. The moisture absorption parameters are determined using this model for six different types of carbon/epoxy nanocomposites. The absorption behaviors obtained at different humidity levels and thermal environments are recovered by minimizing the error between the experimental data and model predictions, thus enabling the accurate determination of the moisture equilibrium level. The absorption behavior and the weight gain of all nanocomposites are shown to be accurately represented by this model over the entire absorption period. The presence of carbon nanomaterials is found to induce varying levels of non-Fickian behavior, governed by the nondimensional hindrance coefficient. This behavior is enhanced with the nanomaterial content and separate from the slight non-Fickian behavior of all neat epoxy samples. The molecular bonding during diffusion, as well as the interfacial moisture storage, could be among the reasons for non-Fickian behavior and should be included in the absorption models for accurate characterization of carbon/epoxy nanocomposites.

Subject Keywords

Hindered diffusion model, Moisture absorption, Nanocomposites, Thermosetting composites

URI

https://hdl.handle.net/11511/98487

Journal

Journal of Composites Science

DOI

https://doi.org/10.3390/jcs4010021

Collections

Department of Aerospace Engineering, Article

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Citation Formats

G. E. Güloğlu and M. C. Altan, “Moisture absorption of carbon/epoxy nanocomposites,” Journal of Composites Science, vol. 4, no. 1, pp. 0–0, 2020, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/98487.