INVESTIGATION OF MECHANICAL PROPERTIES OF POLYIMIDE FILMS UNDER THE INFLUENCE OF LABORATORY-SIMULATED SPACE FACTORS
In work the mechanical properties of polyimide films analogue kapton-H (manufactures of the People's Republic of China) by thickness 75 microns are studied in conditions of uniaxial stretching at temperature 293 K after influence of space factors - a separate and joint irradiation by protons and electrons with energy Е=160 keV and fluence (the total flow of particles with incident on the samples) F=1016 cm-2. The limit of the forced elasticity, the ultimate strength, the total strain before fracture and the contributions to the total deformation related to the elastic deformation occurring in the linear stage, the total forced elastic and irreversible deformation that contribute to the overall deformation of the samples at the nonlinear stage are determined. The total forced elastic deformation consists of a highly elastic deformation, reversible at the test temperature, and delayed elastic deformation. After exposure to irradiation, an increase in the limit of the forced elasticity of the films by 5-11%, a decrease in the ultimate strength by 10-14%, and a reduction in the total deformation by 20-28% were found. The maximum change in all mechanical characteristics occurs under the influence of proton irradiation. It is established that the decrease in the total deformation of irradiated films is mainly due to a 80% reduction in the contribution of irreversible deformation. The contribution of the total forced elastic deformation of the polyimide film practically does not change after irradiation, which has important scientific and applied significance.
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