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finding low concentration side,gas molecules in the polymer and thediffusion of the polymer formed in the gap size and the degree of difficulty.Rigid-Flex and the main chain of carbon atoms of different bond angles,bond lengthis different,the rotation of difficulty within a single bond,different connectorsstructural units,the substituents on a different molecular chain and seat numberof substituents will affect the molecular segments thus affecting the permeability.Polar groups such as light-based,nitrile,hydrogen bond,increasing theinteraction between the molecules,the polymer aggregates more closely,low gaspermeability coefficient.Gas solubility in the polymer usually follows"similarcompatibility"rule.If the polymer to be there when there is a special effect offunctional groups and through the.