Influence of silver metallization and electron irradiation on the processes of mechanical deformation of polyimide films
DOI:
https://doi.org/10.26577/rcph-2019-1-1090Keywords:
polyimide, composite materials, silver metallization, mechanical deformation, modulus of elasticity, young's modulus, electron irradiation, mathematical modelAbstract
The effect of silver metallization and electron irradiation on the physical and mechanical properties of polyimide films is studied. The metal layer of the polyimide base impregnated into the structure was from 1 to 5 µm thick. The coatings on the surface contained 80÷97 % of the relative silver mirror in the visible and infrared regions. The irradiation was carried out on a linear accelerator ELU-6 with an average electron beam energy of 2 MeV, an integral current of up to 1000 µa with a pulse frequency of 200 Hz and a pulse duration of 5 µs. The absorbed dose by the samples was: 10, 20, 30 and 40 MGy. Deformation of the samples was performed at room temperature in the uniaxial tension mode on the universal testing machine Instron 5982. Study of Structural changes in composite materials in the result of the impact of these physical factors was studied in the x-ray diffractometer type DRON–2M in air at 293 K, CuKa radiation (laCu=1.5418 Å).
A significant increase in the mechanical characteristics as a result of metallization of films compared to the pure film, so the increase in the tensile strength by ∆σ=105 MPa and plasticity by ∆ε=75%, which is associated with the peculiarities of changes in the structure of metallized films and the conditions of their chemical etching. Electronic irradiation of the metallized polyimide film worsens its elastic and strength parameters, which is caused by the formation of new phases in the coating in the form of silver oxide, the concentration of which increases with increasing dose, and is also caused by a violation of the ordered structure of the material in the form of a rupture of the macromolecules of polyimide and the formation of new phases of silver in the coating. The mathematical model, which is in good agreement with the experimental data and allows to predict the elastic properties of silver metallized polyimide films, is obtained.
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