Not optimized fitting, except for the 35%HCl-PVDF systems where the HCl diffusivities
were optimized using [C.
in desorption and reabsorption processes are the same, and they are higher than that in the absorption process.
The penetrant diffusivities
in polymers x and y are designated [D.
inner and outer diffusivities
for the antioxidants, reaction consumption of antioxidant and parameters characterizing the inner-wall and outer-wall boundary condions) obtained from the modeling, and a lifetime including both the times for Regime A ([t.
Thus not only the diffusivities
but also the relative water saturation volume fractions of each phase could be determined from the multi-layer model.
Information is presented concerning the transition between Regimes A and B, the diffusivities
of used antioxidants and their radial dependence and the parameters that characterize the boundary conditions.
in glassy polymers at room temperatures were found to be in the range of [10.
From the sorption curves, the diffusivities
(D) for absorption and desorption were derived as follows (41):
Table 2 presents the diffusivities
of all the studied combinations of elastomers and liquids.
Phenylethyl alcohol swells bromobutyl rubber, therefore its diffusivity would be expected to increase with concentration in the polymer, which would imply that the diffusivities
reported here represent upper bounds.
The molecular weights of activator and inhibitor proteins are too similar to explain the difference in diffusivities
Table 4 summarizes the values of diffusivities
of each sample.