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The influence of low temperature on the optical properties of polyimide films and its polymeric composition (PC) with powder filler of high-temperature superconductor (HTS) YBa2Cu3O6+x (where x=0,7) and concentration: 0,05%;0,01%; 0,5% were investigated. The optical characteristics were studied in spectral range 190-1100 nm on spectrophotometer SF-2000. It was established, that the cooling by liquid nitrogen causes the reduction of light-transmission coefficient on 3-6%, but there is no anydoaj:ee18c6f54c584b41a1ff701441a77883 fatcat:wylcocvvlbak5cafqcfmjfw27i