CHANGES IN THE OPTICAL PROPERTIES OF THE SYSTEM "POLYMER - HIGH-TEMPERATURE SUPERCONDUCTORS" UNDER THE INFLUENCE OF TEMPERATURE

Abstract

We have investigated the effect of low temperatures on the structure of the system, "Polyimide - YBa₂Cu₃O_6+x". Were studied IR spectra of the samples in the spectral range 1400– 4200 cm^-1 at room temperature, followed by annealing in liquid nitrogen for 5 minutes and then 72 hours later spectra were taken back. Found that the samples appear with HTS excipients and characteristic absorption bands for the polyimide and for, but the optical properties of the polyimide film is stored only at low concentrations of excipients. With the increase in the same concentration in the IR spectra more pronounced in the broad band characteristic of pure samples of high-temperature superconductors, which is due to crystal hydrates,. The absence of absorption bands of other isolated hydroxyl groups due to the high degree of surface coverage molecules HTS polymer matrix. Exposure to low-temperature annealing by the matrix of the composite material and a polyimide film are not affected by their structure. Reducing the intensity peaks in the 4200 – 1750 cm^-1 is associated with a decrease in concentration of free ions in the structure of the polyimide.

Keywords: polyimide, high temperature superconductor, polymer composite materials, infrared spectroscopy.