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A Model for Adsorption and Diffusion in Water Vapor Barrier Films
Author(s) -
Lian Songyou,
Zhang Jintong,
Wang Jiangyong,
Xu Congkang,
Swart Hendrik C.,
Terblans Jacobus J.
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000609
Subject(s) - polyethylene terephthalate , water vapor , diffusion , materials science , desorption , adsorption , diffusion barrier , sorption , substrate (aquarium) , composite material , chemistry , thermodynamics , layer (electronics) , organic chemistry , oceanography , geology , physics
A model for describing the diffusion behavior of water vapor in barrier films is developed and applied to the cases of 1) pure polyethylene terephthalate (PET); 2) an inorganic thin film (ITF) with defects on a PET substrate (ITF/PET); and 3) PET/ITF/PET. The normalized concentration profile and the relative mass of water vapor in the ITF/PET and PET/ITF/PET barrier films are simulated as a function of diffusion time by considering the sorption and desorption of water vapor. The number of atoms penetrating the barrier films is quantitatively evaluated by the concentration gradient of water vapor, which is related to the water vapor transmission rate (WVTR). The simulated WVTR values in pure PET, PET/SiO x , and PET/SiO x /ORM layered structures are in good agreement with the experimental ones.