Polyetherketoneketone (PEKK) is of increasing interest
for the
manufacture of composites in the aeronautical field. It is essential
to evaluate the PEKK absorption of fluids, especially water, with
which it may come into contact during its processing and use. In this
work, we provide for the first time water transport parameters such
as water diffusivity and solubility for PEKK in amorphous and semicrystalline
states using water immersion as well as dynamic vapor sorption (DVS)
experiments. Water diffusion is modeled using Fick’s second
law with variable boundary conditions, taking into account possible
relative humidity variation during the DVS experiments. Based on similar
characterizations of PEEK, we discuss the fact that PEKK absorbs more
water than PEEK in terms of polarity.
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