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Bi-phasic water diffusion in sheet molding compound composite

Article dans une revue avec comité de lecture
Author
ABDESSALEM, Abir
301055 Université de Sousse
TAMBOURA, Sahbi
301055 Université de Sousse
BEN DALY, Hachmi
301055 Université de Sousse
ccTCHARKHTCHI, Abbas
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccFITOUSSI, Joseph

URI
http://hdl.handle.net/10985/17952
DOI
10.1002/app.48381
Date
2020
Journal
Journal of Applied Polymer Science

Abstract

Sheet molding compound (SMC) composite has been studied under humid-aging conditions. Diffusion of water within the material, as measured by gravimetry, was found to be in good agreement with the “Langmuir-type” diffusion model developed by Carter and Kibler. In their theory, Carter and Kibler consider the existence of two types of water molecules in the material, «mobile» and «bound». In this study, these two types have been considered separately. Furthermore, Infrared spectroscopy (FTIR) analysis has been performed by decomposition of signals to study the fraction of free (mobile) and hydrogen-bounded water. Thermal analysis and microscopic observations were put forward to explain the two types of water molecules. In this contribution, we found a “bi-phasic” water diffusion. We suggest that the «mobile» water corresponding to the diffusion in the micro-porosities follows a Fickien kinetic, which turns to sigmoidal one at a specific time of immersion τ. Whereas the kinetic of «bound» water, referring to crosslinking and plasticization, follows a sigmoidal kinetic, which turns to Fickien behavior when the overall network is saturated.

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