Abstract
Time-resolved D2O ingress in bis[trimethoxysilylpropyl]amine (bis-amino silane) film was studied by in situ neutron reflectivity and Fourier transform infrared reflection‐absorption spectroscopy. The absorbed water exists in two forms: one is dissolved in the polymer matrix (Henry mode) and the other occupies unrelaxed free volume (Langmuir mode). The Langmuir absorption mode dominates in that 30 vol% D2 Oi s accommodated in the free volume with negligible swelling of the film. The Henry absorption lags Langmuir absorption. The quantitative analysis reveals that the initial stage of water diffusion is Fickian, however, a slight deviation from Fickian behavior is observed at the intermediate stage of water ingress.
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