Effect of accelerated high-energy electrons with low absorbed doses on the structure of polyimide press material

The influence of high energy accelerated electrons ($E$ = 5 MeV) and low absorbed doses ($D$ = 5–50 keV) on structural and X-ray dislocation parameters of amorphous-crystalline polyimide press-material PI-PR-20 has been investigated by XRD method. Destruction of polyimide macromolecules at absorbed doses of 5–25 kGy is accompanied by destruction and additional amorphization of macromolecules (domains). At $D$ = 50 kGy, polymerization and crystallization of macromolecules occur with the formation of crystallites with denser packing, increased size of the coherent scattering area and minimal microdistortion of the crystalline lattice of crystallites.