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[3],according to this mechanism,the gas molecules in the polymerization membranepermeation was mainly generated by the difference in the interaction of surfaceconcentration and the gas molecules across the membrane with the membrane materialmolecules to drive.Gas through the membrane step are:(1)the gas adsorbed on thepolymer surface;(2)the gas dissolved in the polymer;(3)the gas to a certainconcentration gradient through the polymer;the other(4)of gas in the polymer asurface desorption.2.2 Factors influence gas permeability in polymersSelect the appropriate high-barrier PET resin modified material,it must considerthe impact of the gas in the polymer permeability factor,and ultimately to obtainstable performance and superb barrier PET barrier material.The gas permeationmechanism in the polymer,the gas permeability coefficient in the polymer is mainlydetermined by the solubility and diffusion coefficients.Therefore,all factorsthat can affect these two factors can all affect the gas permeability coefficientin the polymer.Such as small molecules in composition,structure and surface stateof the polymer adsorption and the polymer surface-related;freedom of.