Effect of thickness of hydrocarbon burning layer on gas barrier permeability of polyvinyl alcohol film

Considering gases retention in plastic microsphere in ICF experiment,the diffusion and permeation behavior of water vapor in hydrocarbon (CH) film,polyvinyl alcohol (PVA) film and polystyrene (PS) film at 40 ℃ 90% relative humidity was studied in this paper. On the basis of experimental data, the permeatibility coefficients of water vapor in three films were worked out,which are separately 1.906×10－13，5.950×10－15，3.432×10－14 mol·m/(m2·s·Pa)，.And the relative humidity of middle layer (PVA) of 53.06% in threelayer structure, which is analogous to multilayer plastic microsphere's, under 40 ℃ 90% relative humidity environmental condition was figured out using an approximate model of multilayer packaging structure. Moreover,the relationship between thickness of CH film and relat