Transformation of the structure of the polyimide film during deformation: The effect of thickness.

The effect of the thickness of the amorphous polymerized films of poly-4,4'-diphenylene oxide pyromellitimide on the structure after deformation by stretching at 293 K and 77 K was studied. The evolution of the macromolecular structure was concluded based on the results of the redistribution of the intensity diffraction peaks. It was established that the structure of films with a thickness of 75 μm is homogeneous and does not cardinal changes after deformation. Deformation of polymer films with a thickness of 125 μm leads to the appearance of regions with long-range order in the sample. [ABSTRACT FROM AUTHOR]