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gas,the gas solubility of a structural unit,solubility of the polymer of gas will be greatly increased.Crosslinking has noeffect on gas solubility in the polymer,but will Hinder the formation of theinstantaneous gap,so that the gas permeability coefficient decreases.Table 2-1summarizes the effects of polymer some common chemical groups on the oxygenpermeability.Table 2-1 Effect of functional groups on the polymer chains of theoxygen permeability[20]Chapter III Characterization Test Principle 3.1 PhaseMorphology Characterization and barrier properties of equal-pressure method:two inthe sample film side respectively pass into the continuous flow of oxygen andnitrogen,the atmospheric pressure is equal on both sides of the sample,the samplewith oxygen at a constant concentration differential across the membrane to causepenetration of oxygen.