Abstract
A study is presented of the structure and permeability of glassy PETP films deformed in adsorption-active media. The permeability of such films depends in an extremal manner on the degree of polymer extension. It is assumed that the permeability growth is connected with an increase in the porosity of the polymer; films dried under isometric conditions contain enclosed micropores, isolated from the surrounding medium by a dense surface layers consisting of fibrillar macromolecular aggregates.
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