Abstract
Films of polyimide PM-A were studied by x-ray diffractometry after deformation at liquid nitrogen and liquid helium temperatures. Deformation at liquid nitrogen temperature causes the formation of two regions with different densities in the films. Deformation of the films at liquid helium temperature does not cause significant changes in their structure. Assuming that the films consist of quasilinear chain molecules, two mechanisms are proposed which provide a qualitative description of the processes taking place in polyimide PM-A films after deformation at low temperatures.
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