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smallmolecules in the polymer matrix diffusion and the polymer has a lot of large freevolume,strong permeability.The elevated temperature,free volume increases,permeability increases;additional bonding of small molecules and macromoleculescooperation with non-key small molecules can also affect the dissolution anddiffusion of the macromolecules.Total summarize factors include:the impact of thegas itself molecular characteristics;effects of polymer blends phase morphology;;influence molecular structure and aggregation structure of the polymer(crystallinefree volume size,etc.)as well as polymer in which the gas molecules andenvironmental factors(temperature,pressure,humidity,etc.)effects.2.3 Effect of polymer structure and physical formIn the polymer,the thermal motion of the polymer chain segments,will form thepolymer through the gap between the instantaneous gas molecular size-appropriate,these momentary gaps gas molecules can be dissolved by the high concentrationdiffusion.