Electrochemical methods were used to study diffusion in materials which contained 20wt% of polytetrafluoroethylene. It was found that the diffusivity decreased with increasing H content (table 114), and this was attributed to the porosity of the materials. An anomalous temperature dependence was attributed to structural changes.
O.A.Petrii, S.J.Vesina, I.I.Korobov, I.V.Kovrigina, K.N.Semenenko: Elektrokhimiya, 1985, 21[11], 1565-8. [Soviet Physics - Electrochemistry, 1985, 21[11], 1482-51)
Table 114
Diffusion of H in Ni3Ce-20wt%PTFE
H (g-ion/cm3) | Temperature (C) | D (cm2/s) |
0.006 | 20 | 5.2 x 10-8 |
0.006 | 40 | 5.6 x 10-8 |
0.006 | 60 | 6.9 x 10-8 |
0.013 | 20 | 2.7 x 10-8 |
0.013 | 40 | 5.2 x 10-8 |
0.013 | 60 | 4.7 x 10-8 |
0.019 | 20 | 1.5 x 10-8 |
0.019 | 40 | 4.9 x 10-8 |
0.019 | 60 | 4.2 x 10-8 |